Rename qPromise() helper to QtPromise::resolve()

For consistency with other helpers, deprecate `qPromise()` in favor of `QtPromise::resolve()` but also add support for calling this helper with lvalue. Add extra unit tests to make sure that rvalue is not copied.

docs/.vuepress/config.js

@@ -51,7 +51,7 @@ module.exports = {
                     'qtpromise/helpers/each',
                     'qtpromise/helpers/filter',
                     'qtpromise/helpers/map',
-                    'qtpromise/helpers/qpromise',
+                    'qtpromise/helpers/resolve',
                     'qtpromise/helpers/qpromiseall'
                 ]
             },

docs/qtpromise/api-reference.md

@@ -31,7 +31,7 @@
 * [`QtPromise::each`](helpers/each.md)
 * [`QtPromise::filter`](helpers/filter.md)
 * [`QtPromise::map`](helpers/map.md)
-* [`qPromise`](helpers/qpromise.md)
+* [`QtPromise::resolve`](helpers/resolve.md)
 * [`qPromiseAll`](helpers/qpromiseall.md)
 
 ## Exceptions
@@ -39,3 +39,7 @@
 * [`QPromiseCanceledException`](exceptions/canceled.md)
 * [`QPromiseTimeoutException`](exceptions/timeout.md)
 * [`QPromiseUndefinedException`](exceptions/undefined.md)
+
+## Deprecations
+
+* `QtPromise::qPromise`: use [`QtPromise::resolve`](helpers/resolve.md) instead (since 0.5.0)

docs/qtpromise/exceptions/canceled.md

@@ -9,7 +9,7 @@ title: QPromiseCanceledException
 This exception is thrown for promise created from a [`QFuture`](../qtconcurrent.md) which has been canceled (e.g. using [`QFuture::cancel()`](http://doc.qt.io/qt-5/qfuture.html#cancel)), for example:
 
 ```cpp
-auto output = qPromise(future)
+auto output = QtPromise::resolve(future)
     .fail([](const QPromiseCanceledException&) {
         // `future` has been canceled!
     });

docs/qtpromise/getting-started.md

@@ -56,7 +56,7 @@ The following method `uncompress` data in a separate thread and returns a [promi
 ```cpp
 QPromise<Entries> uncompress(const QByteArray& data)
 {
-    return qPromise(QtConcurrent::run([](const QByteArray& data) {
+    return QtPromise::resolve(QtConcurrent::run([](const QByteArray& data) {
         Entries entries;
 
         // {...} uncompress data and parse content.

docs/qtpromise/helpers/qpromise.md

@@ -1,21 +0,0 @@
----
-title: qPromise
----
-
-# qPromise
-
-*Since: 0.1.0*
-
-```
-qPromise(T value) -> QPromise<R>
-```
-
-Similar to the [`QPromise<T>::resolve`](../qpromise/resolve.md) static method, creates a promise resolved from a given `value` without the extra typing:
-
-```cpp
-auto promise = qPromise();                // QPromise<void>
-auto promise = qPromise(42);              // QPromise<int>
-auto promise = qPromise(QString("foo"));  // QPromise<QString>
-```
-
-This method also allows to convert `QFuture<T>` to `QPromise<T>` delayed until the `QFuture` is finished ([read more](../qtconcurrent.md#convert)).

docs/qtpromise/helpers/resolve.md

@@ -0,0 +1,21 @@
+---
+title: resolve
+---
+
+# QtPromise::resolve
+
+*Since: 0.5.0*
+
+```
+QtPromise::resolve(T value) -> QPromise<R>
+```
+
+Similar to the [`QPromise<T>::resolve`](../qpromise/resolve.md) static method, creates a promise resolved from a given `value` but without the extra typing:
+
+```cpp
+auto promise = QtPromise::resolve();                // QPromise<void>
+auto promise = QtPromise::resolve(42);              // QPromise<int>
+auto promise = QtPromise::resolve(QString("foo"));  // QPromise<QString>
+```
+
+This method also allows to convert `QFuture<T>` to `QPromise<T>`, delayed until the `QFuture` is finished ([read more](../qtconcurrent.md#convert)).

docs/qtpromise/qpromise/resolve.md

@@ -25,4 +25,4 @@ QPromise<int> compute(const QString& type)
 }
 ```
 
-See also: [`qPromise`](../helpers/qpromise.md)
+See also: [`QtPromise::resolve`](../helpers/resolve.md)

docs/qtpromise/qpromise/wait.md

@@ -15,7 +15,7 @@ This method holds the execution of the remaining code until the `input` promise
 ```cpp
 int result = -1;
 
-QPromise<int> input = qPromise(QtConcurrent::run([]() {
+QPromise<int> input = QtPromise::resolve(QtConcurrent::run([]() {
     return 42;
 })).tap([&](int res) {
     result = res;

docs/qtpromise/qtconcurrent.md

@@ -4,7 +4,7 @@ QtPromise integrates with [QtConcurrent](https://doc.qt.io/qt-5/qtconcurrent-ind
 
 ## <a name="qtconcurrent-convert"></a> Convert
 
-Converting `QFuture<T>` to `QPromise<T>` is done using the [`qPromise`](helpers/qpromise.md) helper:
+Converting `QFuture<T>` to `QPromise<T>` is done using the [`QtPromise::resolve`](helpers/resolve.md) helper:
 
 ```cpp
 QFuture<int> future = QtConcurrent::run([]() {
@@ -12,13 +12,13 @@ QFuture<int> future = QtConcurrent::run([]() {
     return 42;
 });
 
-QPromise<int> promise = qPromise(future);
+QPromise<int> promise = QtPromise::resolve(future);
 ```
 
 or simply:
 
 ```cpp
-auto promise = qPromise(QtConcurrent::run([]() {
+auto promise = QtPromise::resolve(QtConcurrent::run([]() {
     // {...}
 }));
 ```

src/qtpromise/qpromise.inl

@@ -279,9 +279,7 @@ inline QPromise<void> QPromise<void>::all(const Sequence<QPromise<void>, Args...
 
 inline QPromise<void> QPromise<void>::resolve()
 {
-    return QPromise<void>([](const QPromiseResolve<void>& resolve) {
-        resolve();
-    });
+    return QtPromise::resolve();
 }
 
 } // namespace QtPromise

src/qtpromise/qpromise_p.h

@@ -110,9 +110,24 @@ private:
 template <typename T>
 struct PromiseDeduce
 {
-    using Type = QtPromise::QPromise<Unqualified<T>>;
+    using Type = QtPromise::QPromise<T>;
 };
 
+template <typename T>
+struct PromiseDeduce<T&>
+    : public PromiseDeduce<T>
+{ };
+
+template <typename T>
+struct PromiseDeduce<const T>
+    : public PromiseDeduce<T>
+{ };
+
+template <typename T>
+struct PromiseDeduce<const volatile T>
+    : public PromiseDeduce<T>
+{ };
+
 template <typename T>
 struct PromiseDeduce<QtPromise::QPromise<T>>
     : public PromiseDeduce<T>
@@ -128,22 +143,21 @@ struct PromiseFunctor
 template <typename T>
 struct PromiseFulfill
 {
-    static void call(
-        T&& value,
-        const QtPromise::QPromiseResolve<T>& resolve,
-        const QtPromise::QPromiseReject<T>&)
+    template <typename V, typename TResolve, typename TReject>
+    static void call(V&& value, const TResolve& resolve, const TReject&)
     {
-        resolve(std::move(value));
+        resolve(std::forward<V>(value));
     }
 };
 
 template <typename T>
 struct PromiseFulfill<QtPromise::QPromise<T>>
 {
+    template <typename TResolve, typename TReject>
     static void call(
         const QtPromise::QPromise<T>& promise,
-        const QtPromise::QPromiseResolve<T>& resolve,
-        const QtPromise::QPromiseReject<T>& reject)
+        const TResolve& resolve,
+        const TReject& reject)
     {
         if (promise.isFulfilled()) {
             resolve(promise.m_d->value());

src/qtpromise/qpromisehelpers.h

@@ -7,21 +7,34 @@
 namespace QtPromise {
 
 template <typename T>
-static inline typename QtPromisePrivate::PromiseDeduce<T>::Type qPromise(T&& value)
+static inline typename QtPromisePrivate::PromiseDeduce<T>::Type
+resolve(T&& value)
 {
     using namespace QtPromisePrivate;
-    using Promise = typename PromiseDeduce<T>::Type;
-    return Promise([&](
-        const QPromiseResolve<typename Promise::Type>& resolve,
-        const QPromiseReject<typename Promise::Type>& reject) {
-        PromiseFulfill<T>::call(std::forward<T>(value), resolve, reject);
+    using PromiseType = typename PromiseDeduce<T>::Type;
+    using ValueType = typename PromiseType::Type;
+    using ResolveType = QPromiseResolve<ValueType>;
+    using RejectType = QPromiseReject<ValueType>;
+
+    return PromiseType([&](ResolveType&& resolve, RejectType&& reject) {
+        PromiseFulfill<Unqualified<T>>::call(
+            std::forward<T>(value),
+            std::forward<ResolveType>(resolve),
+            std::forward<RejectType>(reject));
     });
 }
 
-static inline QPromise<void> qPromise()
+template <typename T>
+static inline QPromise<T>
+resolve(QPromise<T> value)
 {
-    return QPromise<void>([](
-        const QPromiseResolve<void>& resolve) {
+    return std::move(value);
+}
+
+static inline QPromise<void>
+resolve()
+{
+    return QPromise<void>([](const QPromiseResolve<void>& resolve) {
         resolve();
     });
 }
@@ -153,6 +166,17 @@ static inline QPromise<Sequence> filter(const Sequence& values, Functor fn)
         });
 }
 
+// DEPRECATIONS (remove at version 1)
+
+template <typename... Args>
+Q_DECL_DEPRECATED_X("Use QtPromise::resolve instead")
+static inline auto
+qPromise(Args&&... args)
+    -> decltype(QtPromise::resolve(std::forward<Args>(args)...))
+{
+    return QtPromise::resolve(std::forward<Args>(args)...);
+}
+
 } // namespace QtPromise
 
 #endif // QTPROMISE_QPROMISEHELPERS_H

tests/auto/qtpromise/benchmark/tst_benchmark.cpp

@@ -1,3 +1,5 @@
+#include "../shared/data.h"
+
 // QtPromise
 #include <QtPromise>
 
@@ -20,7 +22,6 @@ class tst_benchmark : public QObject
 
 private Q_SLOTS:
     void valueResolve();
-    void valueResolveStatic();
     void valueReject();
     void valueThen();
     void valueFinally();
@@ -34,72 +35,6 @@ private Q_SLOTS:
 QTEST_MAIN(tst_benchmark)
 #include "tst_benchmark.moc"
 
-struct Logs {
-    int ctor = 0;
-    int copy = 0;
-    int move = 0;
-    int refs = 0;
-
-    void reset() {
-        ctor = 0;
-        copy = 0;
-        move = 0;
-        refs = 0;
-    }
-};
-
-struct Logger
-{
-    Logger() { logs().ctor++; logs().refs++; }
-    Logger(const Logger&) { logs().copy++; logs().refs++; }
-    Logger(Logger&&) { logs().move++; logs().refs++; }
-    ~Logger() { logs().refs--; }
-
-    Logger& operator=(const Logger&) { logs().copy++; return *this; }
-    Logger& operator=(Logger&&) { logs().move++; return *this; }
-
-public: // STATICS
-    static Logs& logs() { static Logs logs; return logs; }
-};
-
-struct Data : public Logger
-{
-    Data(int v): Logger(), m_value(v) {}
-    int value() const { return m_value; }
-
-    // MSVC 2013 doesn't support implicit generation of the move constructor and
-    // operator, so we need to explicitly define these methods and thus the copy
-    // constructor and operator also need to be explicitly defined (error C2280).
-    // https://stackoverflow.com/a/26581337
-
-    Data(const Data& other)
-        : Logger(other)
-        , m_value(other.m_value)
-    { }
-
-    Data(Data&& other) : Logger(std::forward<Data>(other))
-    {
-        qSwap(m_value, other.m_value);
-    }
-
-    Data& operator=(const Data& other)
-    {
-        Logger::operator=(other);
-        m_value = other.m_value;
-        return *this;
-    }
-
-    Data& operator=(Data&& other)
-    {
-        Logger::operator=(std::forward<Data>(other));
-        qSwap(m_value, other.m_value);
-        return *this;
-    }
-
-private:
-    int m_value;
-};
-
 void tst_benchmark::valueResolve()
 {
     {   // should move the value when resolved by rvalue
@@ -127,31 +62,6 @@ void tst_benchmark::valueResolve()
     }
 }
 
-void tst_benchmark::valueResolveStatic()
-{
-    {   // should move the value when resolved by rvalue
-        Data::logs().reset();
-        QPromise<Data>::resolve(Data(42)).wait();
-
-        QCOMPARE(Data::logs().ctor, 1);
-        QCOMPARE(Data::logs().copy, 0);
-        QCOMPARE(Data::logs().move, 1);     // move value to the promise data
-        QCOMPARE(Data::logs().refs, 0);
-    }
-    {   // should create one copy of the value when resolved by lvalue
-        {
-            Data::logs().reset();
-            Data value(42);
-            QPromise<Data>::resolve(value).wait();
-        }
-
-        QCOMPARE(Data::logs().ctor, 1);
-        QCOMPARE(Data::logs().copy, 1);     // copy value to the promise data
-        QCOMPARE(Data::logs().move, 0);
-        QCOMPARE(Data::logs().refs, 0);
-    }
-}
-
 void tst_benchmark::valueReject()
 {
     {   // should not create any data if rejected

tests/auto/qtpromise/deprecations/deprecations.pri

@@ -0,0 +1,5 @@
+include(../qtpromise.pri)
+
+DEFINES -= QT_DEPRECATED_WARNINGS
+gcc:QMAKE_CXXFLAGS += -Wno-deprecated-declarations
+msvc:QMAKE_CXXFLAGS -= -wd4996

tests/auto/qtpromise/deprecations/deprecations.pro

@@ -0,0 +1,3 @@
+TEMPLATE = subdirs
+SUBDIRS += \
+    helpers

tests/auto/qtpromise/deprecations/helpers/helpers.pro

@@ -0,0 +1,3 @@
+TEMPLATE = subdirs
+SUBDIRS += \
+    qpromise

tests/auto/qtpromise/deprecations/helpers/qpromise/qpromise.pro

@@ -0,0 +1,5 @@
+QT += concurrent
+TARGET = tst_deprecations_helpers_qpromise
+SOURCES += $$PWD/tst_qpromise.cpp
+
+include(../../deprecations.pri)

tests/auto/qtpromise/deprecations/helpers/qpromise/tst_qpromise.cpp

@@ -0,0 +1,268 @@
+#include "../../../shared/data.h"
+#include "../../../shared/utils.h"
+
+// QtPromise
+#include <QtPromise>
+
+// Qt
+#include <QtConcurrent>
+#include <QtTest>
+
+// STL
+#include <memory>
+
+using namespace QtPromise;
+
+class tst_deprecations_helpers_qpromise : public QObject
+{
+    Q_OBJECT
+
+private Q_SLOTS:
+    void value();
+    void noValue();
+    void moveRValue();
+    void copyLValue();
+    void qtSharedPtr();
+    void stdSharedPtr();
+    void typedPromise();
+    void voidPromise();
+    void typedFuture();
+    void voidFuture();
+};
+
+QTEST_MAIN(tst_deprecations_helpers_qpromise)
+#include "tst_qpromise.moc"
+
+void tst_deprecations_helpers_qpromise::value()
+{
+    int v0 = 42;
+    const int v1 = 42;
+
+    auto p0 = qPromise(42);
+    auto p1 = qPromise(v0);
+    auto p2 = qPromise(v1);
+
+    Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<int>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<int>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<int>>::value));
+
+    for (const auto& p : {p0, p1, p2}) {
+        QCOMPARE(p.isFulfilled(), true);
+    }
+    for (const auto& p : {p0, p1, p2}) {
+        QCOMPARE(waitForValue(p, -1), 42);
+    }
+}
+
+void tst_deprecations_helpers_qpromise::noValue()
+{
+    auto p = qPromise();
+
+    Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<void>>::value));
+
+    QCOMPARE(p.isFulfilled(), true);
+    QCOMPARE(waitForValue(p, -1, 42), 42);
+}
+
+void tst_deprecations_helpers_qpromise::moveRValue()
+{
+    Data::logs().reset();
+
+    {
+        auto p = qPromise(Data(42)).wait();
+
+        Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<Data>>::value));
+    }
+
+    QCOMPARE(Data::logs().ctor, 1);
+    QCOMPARE(Data::logs().copy, 0);
+    QCOMPARE(Data::logs().move, 1);
+    QCOMPARE(Data::logs().refs, 0);
+}
+
+void tst_deprecations_helpers_qpromise::copyLValue()
+{
+    Data::logs().reset();
+
+    {
+        Data value(42);
+        auto p = qPromise(value).wait();
+
+        Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<Data>>::value));
+    }
+
+    QCOMPARE(Data::logs().ctor, 1);
+    QCOMPARE(Data::logs().copy, 1);
+    QCOMPARE(Data::logs().move, 0);
+    QCOMPARE(Data::logs().refs, 0);
+}
+
+// https://github.com/simonbrunel/qtpromise/issues/6
+void tst_deprecations_helpers_qpromise::qtSharedPtr()
+{
+    Data::logs().reset();
+
+    QWeakPointer<Data> wptr;
+
+    {
+        QSharedPointer<Data> sptr0(new Data(42));
+        const QSharedPointer<Data> sptr1 = sptr0;
+
+        auto p0 = qPromise(QSharedPointer<Data>(new Data(42)));
+        auto p1 = qPromise(sptr0);
+        auto p2 = qPromise(sptr1);
+
+        Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<QSharedPointer<Data>>>::value));
+        Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<QSharedPointer<Data>>>::value));
+        Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<QSharedPointer<Data>>>::value));
+
+        QCOMPARE(waitForValue(p1, QSharedPointer<Data>()), sptr0);
+        QCOMPARE(waitForValue(p2, QSharedPointer<Data>()), sptr1);
+
+        wptr = sptr0;
+
+        QCOMPARE(wptr.isNull(), false);
+        QCOMPARE(Data::logs().refs, 2);
+    }
+
+    QCOMPARE(wptr.isNull(), true);
+
+    QCOMPARE(Data::logs().ctor, 2);
+    QCOMPARE(Data::logs().copy, 0);
+    QCOMPARE(Data::logs().move, 0);
+    QCOMPARE(Data::logs().refs, 0);
+}
+
+// https://github.com/simonbrunel/qtpromise/issues/6
+void tst_deprecations_helpers_qpromise::stdSharedPtr()
+{
+    Data::logs().reset();
+
+    std::weak_ptr<Data> wptr;
+
+    {
+        std::shared_ptr<Data> sptr0(new Data(42));
+        const std::shared_ptr<Data> sptr1 = sptr0;
+
+        auto p0 = qPromise(std::shared_ptr<Data>(new Data(42)));
+        auto p1 = qPromise(sptr0);
+        auto p2 = qPromise(sptr1);
+
+        Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<std::shared_ptr<Data>>>::value));
+        Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<std::shared_ptr<Data>>>::value));
+        Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<std::shared_ptr<Data>>>::value));
+
+        QCOMPARE(waitForValue(p1, std::shared_ptr<Data>()), sptr0);
+        QCOMPARE(waitForValue(p2, std::shared_ptr<Data>()), sptr1);
+
+        wptr = sptr0;
+
+        QCOMPARE(wptr.use_count(), 4l);
+        QCOMPARE(Data::logs().refs, 2);
+    }
+
+    QCOMPARE(wptr.use_count(), 0l);
+
+    QCOMPARE(Data::logs().ctor, 2);
+    QCOMPARE(Data::logs().copy, 0);
+    QCOMPARE(Data::logs().move, 0);
+    QCOMPARE(Data::logs().refs, 0);
+}
+
+void tst_deprecations_helpers_qpromise::typedPromise()
+{
+    auto resolver = [](const QPromiseResolve<int>& resolve) {
+        QtPromisePrivate::qtpromise_defer([=](){
+            resolve(42);
+        });
+    };
+
+    QPromise<int> v0(resolver);
+    const QPromise<int> v1 = v0;
+
+    auto p0 = qPromise(QPromise<int>(resolver));
+    auto p1 = qPromise(v0);
+    auto p2 = qPromise(v1);
+
+    Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<int>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<int>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<int>>::value));
+
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(promise.isPending(), true);
+    }
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(waitForValue(promise, -1), 42);
+    }
+}
+
+void tst_deprecations_helpers_qpromise::voidPromise()
+{
+    auto resolver = [](const QPromiseResolve<void>& resolve) {
+        QtPromisePrivate::qtpromise_defer([=](){
+            resolve();
+        });
+    };
+
+    QPromise<void> v0(resolver);
+    const QPromise<void> v1 = v0;
+
+    auto p0 = qPromise(QPromise<void>(resolver));
+    auto p1 = qPromise(v0);
+    auto p2 = qPromise(v1);
+
+    Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<void>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<void>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<void>>::value));
+
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(promise.isPending(), true);
+    }
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(waitForValue(promise, -1, 42), 42);
+    }
+}
+
+void tst_deprecations_helpers_qpromise::typedFuture()
+{
+    auto fn = [](){ return 42; };
+    QFuture<int> v0 = QtConcurrent::run(fn);
+    const QFuture<int> v1 = v0;
+
+    auto p0 = qPromise(QtConcurrent::run(fn));
+    auto p1 = qPromise(v0);
+    auto p2 = qPromise(v1);
+
+    Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<int>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<int>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<int>>::value));
+
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(promise.isPending(), true);
+    }
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(waitForValue(promise, -1), 42);
+    }
+}
+
+void tst_deprecations_helpers_qpromise::voidFuture()
+{
+    auto fn = [](){ };
+    QFuture<void> v0 = QtConcurrent::run(fn);
+    const QFuture<void> v1 = v0;
+
+    auto p0 = qPromise(QtConcurrent::run(fn));
+    auto p1 = qPromise(v0);
+    auto p2 = qPromise(v1);
+
+    Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<void>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<void>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<void>>::value));
+
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(promise.isPending(), true);
+    }
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(waitForValue(promise, -1, 42), 42);
+    }
+}

tests/auto/qtpromise/exceptions/tst_exceptions.cpp

@@ -29,7 +29,7 @@ namespace {
 template <class E>
 void verify()
 {
-    auto p = qPromise(QtConcurrent::run([]() { throw E(); }));
+    auto p = QtPromise::resolve(QtConcurrent::run([]() { throw E(); }));
     QCOMPARE(p.isPending(), true);
     QCOMPARE(waitForRejected<E>(p), true);
     QCOMPARE(p.isRejected(), true);

tests/auto/qtpromise/future/tst_future.cpp

@@ -52,7 +52,7 @@ QTEST_MAIN(tst_future)
 void tst_future::fulfilled()
 {
     int result = -1;
-    auto p = qPromise(QtConcurrent::run([]() {
+    auto p = QtPromise::resolve(QtConcurrent::run([]() {
         return 42;
     }));
 
@@ -70,7 +70,7 @@ void tst_future::fulfilled()
 void tst_future::fulfilled_void()
 {
     int result = -1;
-    auto p = qPromise(QtConcurrent::run([]() { }));
+    auto p = QtPromise::resolve(QtConcurrent::run([]() { }));
 
     Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<void>>::value));
     QCOMPARE(p.isPending(), true);
@@ -86,7 +86,7 @@ void tst_future::fulfilled_void()
 void tst_future::rejected()
 {
     QString error;
-    auto p = qPromise(QtConcurrent::run([]() {
+    auto p = QtPromise::resolve(QtConcurrent::run([]() {
         throw MyException("foo");
         return 42;
     }));
@@ -106,7 +106,7 @@ void tst_future::rejected()
 void tst_future::rejected_void()
 {
     QString error;
-    auto p = qPromise(QtConcurrent::run([]() {
+    auto p = QtPromise::resolve(QtConcurrent::run([]() {
         throw MyException("foo");
     }));
 
@@ -125,7 +125,7 @@ void tst_future::rejected_void()
 void tst_future::unhandled()
 {
     QString error;
-    auto p = qPromise(QtConcurrent::run([]() {
+    auto p = QtPromise::resolve(QtConcurrent::run([]() {
         throw QString("foo");
         return 42;
     }));
@@ -149,7 +149,7 @@ void tst_future::unhandled()
 void tst_future::unhandled_void()
 {
     QString error;
-    auto p = qPromise(QtConcurrent::run([]() {
+    auto p = QtPromise::resolve(QtConcurrent::run([]() {
         throw QString("foo");
     }));
 
@@ -169,7 +169,7 @@ void tst_future::unhandled_void()
 void tst_future::canceled()
 {
     QString error;
-    auto p = qPromise(QFuture<int>());  // Constructs an empty, canceled future.
+    auto p = QtPromise::resolve(QFuture<int>());  // Constructs an empty, canceled future.
 
     QCOMPARE(p.isPending(), true);
 
@@ -185,7 +185,7 @@ void tst_future::canceled()
 void tst_future::canceled_void()
 {
     QString error;
-    auto p = qPromise(QFuture<void>());  // Constructs an empty, canceled future.
+    auto p = QtPromise::resolve(QFuture<void>());  // Constructs an empty, canceled future.
 
     QCOMPARE(p.isPending(), true);
 
@@ -200,7 +200,7 @@ void tst_future::canceled_void()
 void tst_future::canceledFromThread()
 {
     QString error;
-    auto p = qPromise(QtConcurrent::run([]() {
+    auto p = QtPromise::resolve(QtConcurrent::run([]() {
         throw QPromiseCanceledException();
     }));
 
@@ -217,7 +217,7 @@ void tst_future::canceledFromThread()
 void tst_future::then()
 {
     QString result;
-    auto input = qPromise(42);
+    auto input = QtPromise::resolve(42);
     auto output = input.then([](int res) {
         return QtConcurrent::run([=]() {
             return QString("foo%1").arg(res);
@@ -238,7 +238,7 @@ void tst_future::then()
 void tst_future::then_void()
 {
     QString result;
-    auto input = qPromise();
+    auto input = QtPromise::resolve();
     auto output = input.then([&]() {
         return QtConcurrent::run([&]() {
             result = "foo";
@@ -300,7 +300,7 @@ void tst_future::fail_void()
 
 void tst_future::finally()
 {
-    auto input = qPromise(42);
+    auto input = QtPromise::resolve(42);
     auto output = input.finally([]() {
         return QtConcurrent::run([]() {
             return QString("foo");
@@ -323,7 +323,7 @@ void tst_future::finally()
 
 void tst_future::finallyRejected()
 {
-    auto input = qPromise(42);
+    auto input = QtPromise::resolve(42);
     auto output = input.finally([]() {
         return QtConcurrent::run([]() {
             throw MyException("foo");

tests/auto/qtpromise/helpers/all/tst_all.cpp

@@ -37,13 +37,13 @@ struct SequenceTester
     static void exec()
     {
         Sequence promises{
-            QtPromise::qPromise(42),
-            QtPromise::qPromise(43),
-            QtPromise::qPromise(44)
+            QtPromise::resolve(42),
+            QtPromise::resolve(43),
+            QtPromise::resolve(44)
         };
 
-        promises.push_back(QtPromise::qPromise(45));
-        promises.insert(++promises.begin(), QtPromise::qPromise(46));
+        promises.push_back(QtPromise::resolve(45));
+        promises.insert(++promises.begin(), QtPromise::resolve(46));
         promises.pop_back();
 
         auto p = QtPromise::qPromiseAll(promises);
@@ -60,13 +60,13 @@ struct SequenceTester<Sequence<QPromise<void>, Args...>>
     static void exec()
     {
         Sequence<QPromise<void>, Args...> promises{
-            QtPromise::qPromise(),
-            QtPromise::qPromise(),
-            QtPromise::qPromise()
+            QtPromise::resolve(),
+            QtPromise::resolve(),
+            QtPromise::resolve()
         };
 
-        promises.push_back(QtPromise::qPromise());
-        promises.insert(++promises.begin(), QtPromise::qPromise());
+        promises.push_back(QtPromise::resolve());
+        promises.insert(++promises.begin(), QtPromise::resolve());
         promises.pop_back();
 
         auto p = QtPromise::qPromiseAll(promises);
@@ -99,8 +99,8 @@ void tst_helpers_all::emptySequence_void()
 
 void tst_helpers_all::allPromisesSucceed()
 {
-    auto p0 = QtPromise::qPromise(42);
-    auto p1 = QtPromise::qPromise(44);
+    auto p0 = QtPromise::resolve(42);
+    auto p1 = QtPromise::resolve(44);
     auto p2 = QPromise<int>([](const QPromiseResolve<int>& resolve) {
         QtPromisePrivate::qtpromise_defer([=](){
             resolve(43);
@@ -120,8 +120,8 @@ void tst_helpers_all::allPromisesSucceed()
 
 void tst_helpers_all::allPromisesSucceed_void()
 {
-    auto p0 = QtPromise::qPromise();
-    auto p1 = QtPromise::qPromise();
+    auto p0 = QtPromise::resolve();
+    auto p1 = QtPromise::resolve();
     auto p2 = QPromise<void>([](const QPromiseResolve<void>& resolve) {
         QtPromisePrivate::qtpromise_defer([=](){
             resolve();
@@ -141,8 +141,8 @@ void tst_helpers_all::allPromisesSucceed_void()
 
 void tst_helpers_all::atLeastOnePromiseReject()
 {
-    auto p0 = QtPromise::qPromise(42);
-    auto p1 = QtPromise::qPromise(44);
+    auto p0 = QtPromise::resolve(42);
+    auto p1 = QtPromise::resolve(44);
     auto p2 = QPromise<int>([](const QPromiseResolve<int>&, const QPromiseReject<int>& reject) {
         QtPromisePrivate::qtpromise_defer([=](){
             reject(QString("foo"));
@@ -162,8 +162,8 @@ void tst_helpers_all::atLeastOnePromiseReject()
 
 void tst_helpers_all::atLeastOnePromiseReject_void()
 {
-    auto p0 = QtPromise::qPromise();
-    auto p1 = QtPromise::qPromise();
+    auto p0 = QtPromise::resolve();
+    auto p1 = QtPromise::resolve();
     auto p2 = QPromise<void>([](const QPromiseResolve<void>&, const QPromiseReject<void>& reject) {
         QtPromisePrivate::qtpromise_defer([=](){
             reject(QString("foo"));
@@ -183,9 +183,9 @@ void tst_helpers_all::atLeastOnePromiseReject_void()
 
 void tst_helpers_all::preserveOrder()
 {
-    auto p0 = QtPromise::qPromise(42).delay(500);
-    auto p1 = QtPromise::qPromise(43).delay(100);
-    auto p2 = QtPromise::qPromise(44).delay(250);
+    auto p0 = QtPromise::resolve(42).delay(500);
+    auto p1 = QtPromise::resolve(43).delay(100);
+    auto p2 = QtPromise::resolve(44).delay(250);
 
     auto p = QtPromise::qPromiseAll(QVector<QPromise<int>>{p0, p1, p2});
 

tests/auto/qtpromise/helpers/attempt/tst_attempt.cpp

@@ -64,7 +64,7 @@ void tst_helpers_attempt::futureResult()
 void tst_helpers_attempt::promiseResult()
 {
     auto p = QtPromise::attempt([]() {
-        return QtPromise::qPromise(42).delay(200);
+        return QtPromise::resolve(42).delay(200);
     });
 
     Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<int>>::value));

tests/auto/qtpromise/helpers/resolve/resolve.pro

@@ -1,3 +1,4 @@
+QT += concurrent
 TARGET = tst_helpers_resolve
 SOURCES += $$PWD/tst_resolve.cpp
 

tests/auto/qtpromise/helpers/resolve/tst_resolve.cpp

@@ -1,9 +1,11 @@
+#include "../../shared/data.h"
 #include "../../shared/utils.h"
 
 // QtPromise
 #include <QtPromise>
 
 // Qt
+#include <QtConcurrent>
 #include <QtTest>
 
 // STL
@@ -16,109 +18,251 @@ class tst_helpers_resolve : public QObject
     Q_OBJECT
 
 private Q_SLOTS:
-    void resolveWithValue();
-    void resolveWithNoValue();
-    void resolveWithTypedPromise();
-    void resolveWithVoidPromise();
-    void resolveWithQSharedPtr();
-    void resolveWithStdSharedPtr();
+    void value();
+    void noValue();
+    void moveRValue();
+    void copyLValue();
+    void qtSharedPtr();
+    void stdSharedPtr();
+    void typedPromise();
+    void voidPromise();
+    void typedFuture();
+    void voidFuture();
 };
 
 QTEST_MAIN(tst_helpers_resolve)
 #include "tst_resolve.moc"
 
-void tst_helpers_resolve::resolveWithValue()
+void tst_helpers_resolve::value()
 {
-    const int value = 42;
-    auto p0 = QPromise<int>::resolve(value);
-    auto p1 = QPromise<int>::resolve(43);
+    int v0 = 42;
+    const int v1 = 42;
+
+    auto p0 = QtPromise::resolve(42);
+    auto p1 = QtPromise::resolve(v0);
+    auto p2 = QtPromise::resolve(v1);
 
     Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<int>>::value));
     Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<int>>::value));
-    QCOMPARE(p0.isFulfilled(), true);
-    QCOMPARE(p1.isFulfilled(), true);
-    QCOMPARE(waitForValue(p0, -1), 42);
-    QCOMPARE(waitForValue(p1, -1), 43);
+    Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<int>>::value));
+
+    for (const auto& p : {p0, p1, p2}) {
+        QCOMPARE(p.isFulfilled(), true);
+    }
+    for (const auto& p : {p0, p1, p2}) {
+        QCOMPARE(waitForValue(p, -1), 42);
+    }
 }
 
-void tst_helpers_resolve::resolveWithNoValue()
+void tst_helpers_resolve::noValue()
 {
-    auto p = QPromise<void>::resolve();
+    auto p = QtPromise::resolve();
 
     Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<void>>::value));
+
     QCOMPARE(p.isFulfilled(), true);
     QCOMPARE(waitForValue(p, -1, 42), 42);
 }
 
-void tst_helpers_resolve::resolveWithTypedPromise()
+void tst_helpers_resolve::moveRValue()
 {
-    auto p = QtPromise::qPromise(
-        QPromise<QString>([](const QPromiseResolve<QString>& resolve) {
-            QtPromisePrivate::qtpromise_defer([=](){
-                resolve("foo");
-            });
-        }));
+    Data::logs().reset();
 
-    Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<QString>>::value));
+    {
+        auto p = QtPromise::resolve(Data(42)).wait();
 
-    QCOMPARE(p.isPending(), true);
-    QCOMPARE(waitForValue(p, QString()), QString("foo"));
+        Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<Data>>::value));
+    }
+
+    QCOMPARE(Data::logs().ctor, 1);
+    QCOMPARE(Data::logs().copy, 0);
+    QCOMPARE(Data::logs().move, 1);
+    QCOMPARE(Data::logs().refs, 0);
 }
 
-void tst_helpers_resolve::resolveWithVoidPromise()
+void tst_helpers_resolve::copyLValue()
 {
-    int check;
-    auto p = QtPromise::qPromise(
-        QPromise<void>([&](const QPromiseResolve<void>& resolve) {
-            QtPromisePrivate::qtpromise_defer([=, &check](){
-                check = 8;
-                resolve();
-            });
-        }));
+    Data::logs().reset();
 
-    Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<void>>::value));
+    {
+        Data value(42);
+        auto p = QtPromise::resolve(value).wait();
 
-    QCOMPARE(p.isPending(), true);
-    QCOMPARE(waitForValue(p, -1, 42), 42);
-    QCOMPARE(check, 8);
+        Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<Data>>::value));
+    }
+
+    QCOMPARE(Data::logs().ctor, 1);
+    QCOMPARE(Data::logs().copy, 1);
+    QCOMPARE(Data::logs().move, 0);
+    QCOMPARE(Data::logs().refs, 0);
 }
 
 // https://github.com/simonbrunel/qtpromise/issues/6
-void tst_helpers_resolve::resolveWithQSharedPtr()
+void tst_helpers_resolve::qtSharedPtr()
 {
-    QWeakPointer<int> wptr;
+    Data::logs().reset();
+
+    QWeakPointer<Data> wptr;
 
     {
-        QSharedPointer<int> sptr(new int(42));
-        auto p = QPromise<QSharedPointer<int>>::resolve(sptr);
+        QSharedPointer<Data> sptr0(new Data(42));
+        const QSharedPointer<Data> sptr1 = sptr0;
 
-        QCOMPARE(waitForValue(p, QSharedPointer<int>()), sptr);
+        auto p0 = QtPromise::resolve(QSharedPointer<Data>(new Data(42)));
+        auto p1 = QtPromise::resolve(sptr0);
+        auto p2 = QtPromise::resolve(sptr1);
 
-        wptr = sptr;
-        sptr.reset();
+        Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<QSharedPointer<Data>>>::value));
+        Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<QSharedPointer<Data>>>::value));
+        Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<QSharedPointer<Data>>>::value));
 
-        QCOMPARE(wptr.isNull(), false); // "p" still holds a reference
+        QCOMPARE(waitForValue(p1, QSharedPointer<Data>()), sptr0);
+        QCOMPARE(waitForValue(p2, QSharedPointer<Data>()), sptr1);
+
+        wptr = sptr0;
+
+        QCOMPARE(wptr.isNull(), false);
+        QCOMPARE(Data::logs().refs, 2);
     }
 
     QCOMPARE(wptr.isNull(), true);
+
+    QCOMPARE(Data::logs().ctor, 2);
+    QCOMPARE(Data::logs().copy, 0);
+    QCOMPARE(Data::logs().move, 0);
+    QCOMPARE(Data::logs().refs, 0);
 }
 
 // https://github.com/simonbrunel/qtpromise/issues/6
-void tst_helpers_resolve::resolveWithStdSharedPtr()
+void tst_helpers_resolve::stdSharedPtr()
 {
-    std::weak_ptr<int> wptr;
+    Data::logs().reset();
+
+    std::weak_ptr<Data> wptr;
 
     {
-        std::shared_ptr<int> sptr(new int(42));
-        auto p = QPromise<std::shared_ptr<int>>::resolve(sptr);
+        std::shared_ptr<Data> sptr0(new Data(42));
+        const std::shared_ptr<Data> sptr1 = sptr0;
 
-        QCOMPARE(waitForValue(p, std::shared_ptr<int>()), sptr);
+        auto p0 = QtPromise::resolve(std::shared_ptr<Data>(new Data(42)));
+        auto p1 = QtPromise::resolve(sptr0);
+        auto p2 = QtPromise::resolve(sptr1);
 
-        wptr = sptr;
-        sptr.reset();
+        Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<std::shared_ptr<Data>>>::value));
+        Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<std::shared_ptr<Data>>>::value));
+        Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<std::shared_ptr<Data>>>::value));
 
-        QCOMPARE(wptr.use_count(), 1l); // "p" still holds a reference
+        QCOMPARE(waitForValue(p1, std::shared_ptr<Data>()), sptr0);
+        QCOMPARE(waitForValue(p2, std::shared_ptr<Data>()), sptr1);
+
+        wptr = sptr0;
+
+        QCOMPARE(wptr.use_count(), 4l);
+        QCOMPARE(Data::logs().refs, 2);
     }
 
     QCOMPARE(wptr.use_count(), 0l);
+
+    QCOMPARE(Data::logs().ctor, 2);
+    QCOMPARE(Data::logs().copy, 0);
+    QCOMPARE(Data::logs().move, 0);
+    QCOMPARE(Data::logs().refs, 0);
+}
+
+void tst_helpers_resolve::typedPromise()
+{
+    auto resolver = [](const QPromiseResolve<int>& resolve) {
+        QtPromisePrivate::qtpromise_defer([=](){
+            resolve(42);
+        });
+    };
+
+    QPromise<int> v0(resolver);
+    const QPromise<int> v1 = v0;
+
+    auto p0 = QtPromise::resolve(QPromise<int>(resolver));
+    auto p1 = QtPromise::resolve(v0);
+    auto p2 = QtPromise::resolve(v1);
+
+    Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<int>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<int>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<int>>::value));
+
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(promise.isPending(), true);
+    }
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(waitForValue(promise, -1), 42);
+    }
+}
+
+void tst_helpers_resolve::voidPromise()
+{
+    auto resolver = [](const QPromiseResolve<void>& resolve) {
+        QtPromisePrivate::qtpromise_defer([=](){
+            resolve();
+        });
+    };
+
+    QPromise<void> v0(resolver);
+    const QPromise<void> v1 = v0;
+
+    auto p0 = QtPromise::resolve(QPromise<void>(resolver));
+    auto p1 = QtPromise::resolve(v0);
+    auto p2 = QtPromise::resolve(v1);
+
+    Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<void>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<void>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<void>>::value));
+
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(promise.isPending(), true);
+    }
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(waitForValue(promise, -1, 42), 42);
+    }
+}
+
+void tst_helpers_resolve::typedFuture()
+{
+    auto fn = [](){ return 42; };
+    QFuture<int> v0 = QtConcurrent::run(fn);
+    const QFuture<int> v1 = v0;
+
+    auto p0 = QtPromise::resolve(QtConcurrent::run(fn));
+    auto p1 = QtPromise::resolve(v0);
+    auto p2 = QtPromise::resolve(v1);
+
+    Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<int>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<int>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<int>>::value));
+
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(promise.isPending(), true);
+    }
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(waitForValue(promise, -1), 42);
+    }
+}
+
+void tst_helpers_resolve::voidFuture()
+{
+    auto fn = [](){ };
+    QFuture<void> v0 = QtConcurrent::run(fn);
+    const QFuture<void> v1 = v0;
+
+    auto p0 = QtPromise::resolve(QtConcurrent::run(fn));
+    auto p1 = QtPromise::resolve(v0);
+    auto p2 = QtPromise::resolve(v1);
+
+    Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<void>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<void>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<void>>::value));
+
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(promise.isPending(), true);
+    }
+    for (const auto& promise : {p0, p1, p2}) {
+        QCOMPARE(waitForValue(promise, -1, 42), 42);
+    }
 }

tests/auto/qtpromise/qpromise/each/tst_each.cpp

@@ -34,14 +34,14 @@ struct SequenceTester
     static void exec()
     {
         QVector<int> values;
-        auto p = QtPromise::qPromise(Sequence{42, 43, 44}).each([&](int v, int i) {
+        auto p = QtPromise::resolve(Sequence{42, 43, 44}).each([&](int v, int i) {
             values << i << v;
         }).each([&](int v, ...) {
             values << v;
             return QString("foo");
         }).each([&](int v, ...) {
             values << v + 1;
-            return QPromise<QString>::resolve(QString("foo")).then([&](){
+            return QtPromise::resolve(QString("foo")).then([&](){
                 values << -1;
             });
         }).each([&](int v, ...) {

tests/auto/qtpromise/qpromise/filter/tst_filter.cpp

@@ -33,7 +33,7 @@ struct SequenceTester
 {
     static void exec()
     {
-        auto p = QtPromise::qPromise(Sequence{
+        auto p = QtPromise::resolve(Sequence{
             42, 43, 44, 45, 46, 47, 48, 49, 50, 51
         }).filter([](int v, ...) {
             return v > 42 && v < 51;

tests/auto/qtpromise/qpromise/map/tst_map.cpp

@@ -34,12 +34,12 @@ struct SequenceTester
 {
     static void exec()
     {
-        auto p = QtPromise::qPromise(Sequence{42, 43, 44}).map([](int v, ...) {
+        auto p = QtPromise::resolve(Sequence{42, 43, 44}).map([](int v, ...) {
             return QString::number(v + 1);
         }).map([](const QString& v, int i) {
-            return QtPromise::qPromise(QString("%1:%2").arg(i).arg(v));
+            return QtPromise::resolve(QString("%1:%2").arg(i).arg(v));
         }).map([](const QString& v, ...) {
-            return QtPromise::qPromise((v + "!").toUtf8());
+            return QtPromise::resolve((v + "!").toUtf8());
         }).map([](const QByteArray& v, ...) {
             return QString::fromUtf8(v);
         });
@@ -53,7 +53,7 @@ struct SequenceTester
 
 void tst_qpromise_map::emptySequence()
 {
-    auto p = QtPromise::qPromise(QVector<int>{}).map([](int v, ...) {
+    auto p = QtPromise::resolve(QVector<int>{}).map([](int v, ...) {
         return v + 1;
     });
 
@@ -63,7 +63,7 @@ void tst_qpromise_map::emptySequence()
 
 void tst_qpromise_map::modifyValues()
 {
-    auto p = QtPromise::qPromise(QVector<int>{42, 43, 44}).map([](int v, ...) {
+    auto p = QtPromise::resolve(QVector<int>{42, 43, 44}).map([](int v, ...) {
         return v + 1;
     });
 
@@ -73,7 +73,7 @@ void tst_qpromise_map::modifyValues()
 
 void tst_qpromise_map::convertValues()
 {
-    auto p = QtPromise::qPromise(QVector<int>{42, 43, 44}).map([](int v, ...) {
+    auto p = QtPromise::resolve(QVector<int>{42, 43, 44}).map([](int v, ...) {
         return QString::number(v + 1);
     });
 
@@ -83,7 +83,7 @@ void tst_qpromise_map::convertValues()
 
 void tst_qpromise_map::delayedFulfilled()
 {
-    auto p = QtPromise::qPromise(QVector<int>{42, 43, 44}).map([](int v, ...) {
+    auto p = QtPromise::resolve(QVector<int>{42, 43, 44}).map([](int v, ...) {
         return QPromise<int>([&](const QPromiseResolve<int>& resolve) {
                 QtPromisePrivate::qtpromise_defer([=]() {
                     resolve(v + 1);
@@ -97,7 +97,7 @@ void tst_qpromise_map::delayedFulfilled()
 
 void tst_qpromise_map::delayedRejected()
 {
-    auto p = QtPromise::qPromise(QVector<int>{42, 43, 44}).map([](int v, ...) {
+    auto p = QtPromise::resolve(QVector<int>{42, 43, 44}).map([](int v, ...) {
         return QPromise<int>([&](
             const QPromiseResolve<int>& resolve,
             const QPromiseReject<int>& reject) {
@@ -116,7 +116,7 @@ void tst_qpromise_map::delayedRejected()
 
 void tst_qpromise_map::functorThrows()
 {
-    auto p = QtPromise::qPromise(QVector<int>{42, 43, 44}).map([](int v, ...) {
+    auto p = QtPromise::resolve(QVector<int>{42, 43, 44}).map([](int v, ...) {
         if (v == 43) {
             throw QString("foo");
         }
@@ -129,7 +129,7 @@ void tst_qpromise_map::functorThrows()
 
 void tst_qpromise_map::functorArguments()
 {
-    auto p1 = QtPromise::qPromise(QVector<int>{42, 42, 42}).map([](int v, int i) {
+    auto p1 = QtPromise::resolve(QVector<int>{42, 42, 42}).map([](int v, int i) {
         return v * i;
     });
 
@@ -139,8 +139,8 @@ void tst_qpromise_map::functorArguments()
 
 void tst_qpromise_map::preserveOrder()
 {
-    auto p = QtPromise::qPromise(QVector<int>{250, 500, 100}).map([](int v, ...) {
-        return QtPromise::qPromise(v + 1).delay(v);
+    auto p = QtPromise::resolve(QVector<int>{250, 500, 100}).map([](int v, ...) {
+        return QtPromise::resolve(v + 1).delay(v);
     });
 
     Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<QVector<int>>>::value));

tests/auto/qtpromise/qpromise/qpromise.pro

@@ -8,6 +8,7 @@ SUBDIRS += \
     finally \
     map \
     operators \
+    resolve \
     tap \
     tapfail \
     then \

tests/auto/qtpromise/qpromise/resolve/resolve.pro

@@ -0,0 +1,4 @@
+TARGET = tst_qpromise_resolve
+SOURCES += $$PWD/tst_resolve.cpp
+
+include(../../qtpromise.pri)

tests/auto/qtpromise/qpromise/resolve/tst_resolve.cpp

@@ -0,0 +1,165 @@
+#include "../../shared/data.h"
+#include "../../shared/utils.h"
+
+// QtPromise
+#include <QtPromise>
+
+// Qt
+#include <QtTest>
+
+// STL
+#include <memory>
+
+using namespace QtPromise;
+
+class tst_qpromise_resolve : public QObject
+{
+    Q_OBJECT
+
+private Q_SLOTS:
+    void value();
+    void noValue();
+    void moveRValue();
+    void copyLValue();
+    void qtSharedPtr();
+    void stdSharedPtr();
+};
+
+QTEST_MAIN(tst_qpromise_resolve)
+#include "tst_resolve.moc"
+
+void tst_qpromise_resolve::value()
+{
+    int v0 = 42;
+    const int v1 = 42;
+
+    auto p0 = QPromise<int>::resolve(42);
+    auto p1 = QPromise<int>::resolve(v0);
+    auto p2 = QPromise<int>::resolve(v1);
+
+    Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<int>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<int>>::value));
+    Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<int>>::value));
+
+    for (const auto& p : {p0, p1, p2}) {
+        QCOMPARE(p.isFulfilled(), true);
+    }
+    for (const auto& p : {p0, p1, p2}) {
+        QCOMPARE(waitForValue(p, -1), 42);
+    }
+}
+
+void tst_qpromise_resolve::noValue()
+{
+    auto p = QPromise<void>::resolve();
+
+    Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<void>>::value));
+
+    QCOMPARE(p.isFulfilled(), true);
+    QCOMPARE(waitForValue(p, -1, 42), 42);
+}
+
+void tst_qpromise_resolve::moveRValue()
+{
+    Data::logs().reset();
+
+    {
+        auto p = QtPromise::resolve(Data(42)).wait();
+
+        Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<Data>>::value));
+    }
+
+    QCOMPARE(Data::logs().ctor, 1);
+    QCOMPARE(Data::logs().copy, 0);
+    QCOMPARE(Data::logs().move, 1);
+    QCOMPARE(Data::logs().refs, 0);
+}
+
+void tst_qpromise_resolve::copyLValue()
+{
+    Data::logs().reset();
+
+    {
+        Data value(42);
+        auto p = QtPromise::resolve(value).wait();
+
+        Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<Data>>::value));
+    }
+
+    QCOMPARE(Data::logs().ctor, 1);
+    QCOMPARE(Data::logs().copy, 1);
+    QCOMPARE(Data::logs().move, 0);
+    QCOMPARE(Data::logs().refs, 0);
+}
+
+// https://github.com/simonbrunel/qtpromise/issues/6
+void tst_qpromise_resolve::qtSharedPtr()
+{
+    Data::logs().reset();
+
+    QWeakPointer<Data> wptr;
+
+    {
+        QSharedPointer<Data> sptr0(new Data(42));
+        const QSharedPointer<Data> sptr1 = sptr0;
+
+        auto p0 = QPromise<QSharedPointer<Data>>::resolve(QSharedPointer<Data>(new Data(42)));
+        auto p1 = QPromise<QSharedPointer<Data>>::resolve(sptr0);
+        auto p2 = QPromise<QSharedPointer<Data>>::resolve(sptr1);
+
+        Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<QSharedPointer<Data>>>::value));
+        Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<QSharedPointer<Data>>>::value));
+        Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<QSharedPointer<Data>>>::value));
+
+        QCOMPARE(waitForValue(p1, QSharedPointer<Data>()), sptr0);
+        QCOMPARE(waitForValue(p2, QSharedPointer<Data>()), sptr1);
+
+        wptr = sptr0;
+
+        QCOMPARE(wptr.isNull(), false);
+        QCOMPARE(Data::logs().refs, 2);
+    }
+
+    QCOMPARE(wptr.isNull(), true);
+
+    QCOMPARE(Data::logs().ctor, 2);
+    QCOMPARE(Data::logs().copy, 0);
+    QCOMPARE(Data::logs().move, 0);
+    QCOMPARE(Data::logs().refs, 0);
+}
+
+// https://github.com/simonbrunel/qtpromise/issues/6
+void tst_qpromise_resolve::stdSharedPtr()
+{
+    Data::logs().reset();
+
+    std::weak_ptr<Data> wptr;
+
+    {
+        std::shared_ptr<Data> sptr0(new Data(42));
+        const std::shared_ptr<Data> sptr1 = sptr0;
+
+        auto p0 = QPromise<std::shared_ptr<Data>>::resolve(std::shared_ptr<Data>(new Data(42)));
+        auto p1 = QPromise<std::shared_ptr<Data>>::resolve(sptr0);
+        auto p2 = QPromise<std::shared_ptr<Data>>::resolve(sptr1);
+
+        Q_STATIC_ASSERT((std::is_same<decltype(p0), QPromise<std::shared_ptr<Data>>>::value));
+        Q_STATIC_ASSERT((std::is_same<decltype(p1), QPromise<std::shared_ptr<Data>>>::value));
+        Q_STATIC_ASSERT((std::is_same<decltype(p2), QPromise<std::shared_ptr<Data>>>::value));
+
+        QCOMPARE(waitForValue(p1, std::shared_ptr<Data>()), sptr0);
+        QCOMPARE(waitForValue(p2, std::shared_ptr<Data>()), sptr1);
+
+        wptr = sptr0;
+
+        QCOMPARE(wptr.use_count(), 4l);
+        QCOMPARE(Data::logs().refs, 2);
+    }
+
+    QCOMPARE(wptr.use_count(), 0l);
+
+    QCOMPARE(Data::logs().ctor, 2);
+    QCOMPARE(Data::logs().copy, 0);
+    QCOMPARE(Data::logs().move, 0);
+    QCOMPARE(Data::logs().refs, 0);
+}

tests/auto/qtpromise/qtpromise.pri

@@ -8,7 +8,7 @@ DEFINES += QT_DEPRECATED_WARNINGS
 # Additional warnings and make all warnings into errors
 # https://github.com/simonbrunel/qtpromise/issues/10
 gcc:QMAKE_CXXFLAGS += -Werror -Wold-style-cast
-msvc:QMAKE_CXXFLAGS -= -WX
+msvc:QMAKE_CXXFLAGS += -WX
 
 coverage {
     gcc {
@@ -21,6 +21,7 @@ coverage {
 }
 
 HEADERS += \
+    $$PWD/shared/data.h \
     $$PWD/shared/object.h \
     $$PWD/shared/utils.h
 

tests/auto/qtpromise/qtpromise.pro

@@ -1,6 +1,7 @@
 TEMPLATE = subdirs
 SUBDIRS += \
     benchmark \
+    deprecations \
     exceptions \
     future \
     helpers \

tests/auto/qtpromise/shared/data.h

@@ -0,0 +1,76 @@
+#ifndef QTPROMISE_TESTS_AUTO_SHARED_DATA_H
+#define QTPROMISE_TESTS_AUTO_SHARED_DATA_H
+
+// STL
+#include <utility>
+
+struct Logs {
+    int ctor = 0;
+    int copy = 0;
+    int move = 0;
+    int refs = 0;
+
+    void reset() {
+        ctor = 0;
+        copy = 0;
+        move = 0;
+        refs = 0;
+    }
+};
+
+struct Logger
+{
+    Logger() { logs().ctor++; logs().refs++; }
+    Logger(const Logger&) { logs().copy++; logs().refs++; }
+    Logger(Logger&&) { logs().move++; logs().refs++; }
+    ~Logger() { logs().refs--; }
+
+    Logger& operator=(const Logger&) { logs().copy++; return *this; }
+    Logger& operator=(Logger&&) { logs().move++; return *this; }
+
+public: // STATICS
+    static Logs& logs() { static Logs logs; return logs; }
+};
+
+struct Data : public Logger
+{
+    Data(int v) : Logger(), m_value(v) {}
+    int value() const { return m_value; }
+
+    // MSVC 2013 doesn't support implicit generation of the move constructor and
+    // operator, so we need to explicitly define these methods and thus the copy
+    // constructor and operator also need to be explicitly defined (error C2280).
+    // https://stackoverflow.com/a/26581337
+
+    Data(const Data& other)
+        : Logger(other)
+        , m_value(other.m_value)
+    { }
+
+    Data(Data&& other) : Logger(std::forward<Data>(other))
+    {
+        std::swap(m_value, other.m_value);
+    }
+
+    Data& operator=(const Data& other)
+    {
+        Logger::operator=(other);
+        m_value = other.m_value;
+        return *this;
+    }
+
+    Data& operator=(Data&& other)
+    {
+        Logger::operator=(std::forward<Data>(other));
+        std::swap(m_value, other.m_value);
+        return *this;
+    }
+
+    bool operator==(const Data& other) const { return (m_value == other.m_value); }
+    bool operator!=(const Data& other) const { return (m_value != other.m_value); }
+
+private:
+    int m_value;
+};
+
+#endif // QTPROMISE_TESTS_AUTO_SHARED_DATA_H

tests/auto/qtpromise/thread/tst_thread.cpp

@@ -102,7 +102,7 @@ void tst_thread::then()
 
     int value = -1;
     QThread* target = nullptr;
-    qPromise(QtConcurrent::run([&](const QPromise<int>& p) {
+    QtPromise::resolve(QtConcurrent::run([&](const QPromise<int>& p) {
         p.then([&](int res) {
             target = QThread::currentThread();
             value = res;
@@ -125,7 +125,7 @@ void tst_thread::then_void()
 
     int value = -1;
     QThread* target = nullptr;
-    qPromise(QtConcurrent::run([&](const QPromise<void>& p) {
+    QtPromise::resolve(QtConcurrent::run([&](const QPromise<void>& p) {
         p.then([&]() {
             target = QThread::currentThread();
             value = 43;
@@ -148,7 +148,7 @@ void tst_thread::fail()
 
     QString error;
     QThread* target = nullptr;
-    qPromise(QtConcurrent::run([&](const QPromise<int>& p) {
+    QtPromise::resolve(QtConcurrent::run([&](const QPromise<int>& p) {
         p.fail([&](const QString& err) {
             target = QThread::currentThread();
             error = err;
@@ -172,7 +172,7 @@ void tst_thread::finally()
 
     int value = -1;
     QThread* target = nullptr;
-    qPromise(QtConcurrent::run([&](const QPromise<int>& p) {
+    QtPromise::resolve(QtConcurrent::run([&](const QPromise<int>& p) {
         p.finally([&]() {
             target = QThread::currentThread();
             value = 43;