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Enhance QPromise::finally implementation

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Make sure that the chained value is not copied when `finally` is called for a fulfilled input promise. The value was copied 7 times in the previous version because it was captured in a lambda, which one copied multiple times.
This commit is contained in:
Simon Brunel
2017-08-23 10:56:39 +02:00
parent 49a1d6a57b
commit 25d2bad54f
4 changed files with 96 additions and 86 deletions
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100
tests/auto/qpromise/tst_qpromise.cpp
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@ -30,8 +30,10 @@ private Q_SLOTS:
void failBaseClass();
void failCatchAll();
void finallyReturns();
void finallyReturns_void();
void finallyFulfilled();
void finallyFulfilled_void();
void finallyRejected();
void finallyRejected_void();
void finallyThrows();
void finallyThrows_void();
void finallyDelayedResolved();
@ -355,60 +357,60 @@ void tst_qpromise::failCatchAll()
QCOMPARE(error, QString("bar"));
}
void tst_qpromise::finallyReturns()
void tst_qpromise::finallyFulfilled()
{
{ // fulfilled
int value = -1;
auto p = QPromise<int>::resolve(42).finally([&]() {
value = 8;
return 16; // ignored!
});
int value = -1;
auto p = QPromise<int>::resolve(42).finally([&]() {
value = 8;
return 16; // ignored!
});
Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<int> >::value));
QCOMPARE(waitForValue(p, -1), 42);
QCOMPARE(p.isFulfilled(), true);
QCOMPARE(value, 8);
}
{ // rejected
int value = -1;
auto p = QPromise<int>::reject(QString("foo")).finally([&]() {
value = 8;
return 16; // ignored!
});
Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<int> >::value));
QCOMPARE(waitForError(p, QString()), QString("foo"));
QCOMPARE(p.isRejected(), true);
QCOMPARE(value, 8);
}
Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<int> >::value));
QCOMPARE(waitForValue(p, -1), 42);
QCOMPARE(p.isFulfilled(), true);
QCOMPARE(value, 8);
}
void tst_qpromise::finallyReturns_void()
void tst_qpromise::finallyFulfilled_void()
{
{ // fulfilled
int value = -1;
auto p = QPromise<void>::resolve().finally([&]() {
value = 8;
return 16; // ignored!
});
int value = -1;
auto p = QPromise<void>::resolve().finally([&]() {
value = 8;
return 16; // ignored!
});
Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<void> >::value));
QCOMPARE(waitForValue(p, -1, 42), 42);
QCOMPARE(p.isFulfilled(), true);
QCOMPARE(value, 8);
}
{ // rejected
int value = -1;
auto p = QPromise<void>::reject(QString("foo")).finally([&]() {
value = 8;
return 16; // ignored!
});
Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<void> >::value));
QCOMPARE(waitForValue(p, -1, 42), 42);
QCOMPARE(p.isFulfilled(), true);
QCOMPARE(value, 8);
}
Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<void> >::value));
QCOMPARE(waitForError(p, QString()), QString("foo"));
QCOMPARE(p.isRejected(), true);
QCOMPARE(value, 8);
}
void tst_qpromise::finallyRejected()
{
int value = -1;
auto p = QPromise<int>::reject(QString("foo")).finally([&]() {
value = 8;
return 16; // ignored!
});
Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<int> >::value));
QCOMPARE(waitForError(p, QString()), QString("foo"));
QCOMPARE(p.isRejected(), true);
QCOMPARE(value, 8);
}
void tst_qpromise::finallyRejected_void()
{
int value = -1;
auto p = QPromise<void>::reject(QString("foo")).finally([&]() {
value = 8;
return 16; // ignored!
});
Q_STATIC_ASSERT((std::is_same<decltype(p), QPromise<void> >::value));
QCOMPARE(waitForError(p, QString()), QString("foo"));
QCOMPARE(p.isRejected(), true);
QCOMPARE(value, 8);
}
void tst_qpromise::finallyThrows()