FTXUI/include/ftxui/util/ref.hpp

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#ifndef FTXUI_UTIL_REF_HPP
#define FTXUI_UTIL_REF_HPP
#include <ftxui/screen/string.hpp>
#include <string>
namespace ftxui {
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/// @brief An adapter. Own or reference an immutable object.
template <typename T>
class ConstRef {
public:
ConstRef() {}
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ConstRef(T t) : owned_(t) {}
ConstRef(const T* t) : address_(t) {}
const T& operator*() const { return address_ ? *address_ : owned_; }
const T& operator()() const { return address_ ? *address_ : owned_; }
const T* operator->() const { return address_ ? address_ : &owned_; }
private:
T owned_;
const T* address_ = nullptr;
};
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/// @brief An adapter. Own or reference an mutable object.
template <typename T>
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class Ref {
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public:
Ref() {}
Ref(const T& t) : owned_(t) {}
Ref(T&& t) : owned_(std::forward<T>(t)) {}
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Ref(T* t) : address_(t) {}
T& operator*() { return address_ ? *address_ : owned_; }
T& operator()() { return address_ ? *address_ : owned_; }
T* operator->() { return address_ ? address_ : &owned_; }
private:
T owned_;
T* address_ = nullptr;
};
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/// @brief An adapter. Own or reference a constant string. For convenience, this
/// class convert multiple mutable string toward a shared representation.
class StringRef {
public:
StringRef(std::string* ref) : address_(ref) {}
StringRef(std::string ref) : owned_(std::move(ref)) {}
StringRef(const wchar_t* ref) : StringRef(to_string(std::wstring(ref))) {}
StringRef(const char* ref) : StringRef(std::string(ref)) {}
std::string& operator*() { return address_ ? *address_ : owned_; }
std::string* operator->() { return address_ ? address_ : &owned_; }
private:
std::string owned_;
std::string* address_ = nullptr;
};
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/// @brief An adapter. Own or reference a constant string. For convenience, this
/// class convert multiple immutable string toward a shared representation.
class ConstStringRef {
public:
ConstStringRef(const std::string* ref) : address_(ref) {}
ConstStringRef(const std::wstring* ref) : ConstStringRef(to_string(*ref)) {}
ConstStringRef(std::string ref) : owned_(std::move(ref)) {}
ConstStringRef(std::wstring ref) : ConstStringRef(to_string(ref)) {}
ConstStringRef(const wchar_t* ref) : ConstStringRef(std::wstring(ref)) {}
ConstStringRef(const char* ref)
: ConstStringRef(to_wstring(std::string(ref))) {}
const std::string& operator*() const { return address_ ? *address_ : owned_; }
const std::string* operator->() const {
return address_ ? address_ : &owned_;
}
private:
const std::string owned_;
const std::string* address_ = nullptr;
};
/// @brief An adapter. Reference a list of strings.
class ConstStringListRef {
public:
ConstStringListRef(const std::vector<std::string>* ref) : ref_(ref) {}
ConstStringListRef(const std::vector<std::wstring>* ref) : ref_wide_(ref) {}
size_t size() const { return ref_ ? ref_->size() : ref_wide_->size(); }
std::string operator[](size_t i) const {
return ref_ ? (*ref_)[i] : to_string((*ref_wide_)[i]);
}
private:
const std::vector<std::string>* ref_ = nullptr;
const std::vector<std::wstring>* ref_wide_ = nullptr;
};
} // namespace ftxui
#endif /* end of include guard: FTXUI_UTIL_REF_HPP */
// Copyright 2020 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.