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/* | |
Corrade::Containers::Pointer | |
— a lightweight alternative to std::unique_ptr | |
https://doc.magnum.graphics/corrade/classCorrade_1_1Containers_1_1Pointer.html | |
This is a single-header library generated from the Corrade project. With | |
the goal being easy integration, it's deliberately free of all comments | |
to keep the file size small. More info, detailed changelogs and docs here: | |
- Project homepage — https://magnum.graphics/corrade/ | |
- Documentation — https://doc.magnum.graphics/corrade/ | |
- GitHub project page — https://github.com/mosra/corrade | |
- GitHub Singles repository — https://github.com/mosra/magnum-singles | |
v2018.10-232-ge927d7f3 (2019-01-28) | |
- Stricter matching for external representation conversion | |
- Ability to convert from external representation also using pointer() | |
v2018.10-183-g4eb1adc0 (2019-01-23) | |
- Initial release | |
Generated from Corrade v2018.10-232-ge927d7f3 (2019-01-28), 259 / 2321 LoC | |
*/ | |
/* | |
This file is part of Corrade. | |
Copyright © 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, | |
2017, 2018, 2019 Vladimír Vondruš <mosra@centrum.cz> | |
Permission is hereby granted, free of charge, to any person obtaining a | |
copy of this software and associated documentation files (the "Software"), | |
to deal in the Software without restriction, including without limitation | |
the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
and/or sell copies of the Software, and to permit persons to whom the | |
Software is furnished to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included | |
in all copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
DEALINGS IN THE SOFTWARE. | |
*/ | |
#include <cassert> | |
#include <type_traits> | |
#include <utility> | |
#ifndef Corrade_Containers_Tags_h | |
#define Corrade_Containers_Tags_h | |
namespace Corrade { namespace Containers { | |
struct DefaultInitT { | |
struct Init{}; | |
constexpr explicit DefaultInitT(Init) {} | |
}; | |
struct ValueInitT { | |
struct Init{}; | |
constexpr explicit ValueInitT(Init) {} | |
}; | |
struct NoInitT { | |
struct Init{}; | |
constexpr explicit NoInitT(Init) {} | |
}; | |
struct NoCreateT { | |
struct Init{}; | |
constexpr explicit NoCreateT(Init) {} | |
}; | |
struct DirectInitT { | |
struct Init{}; | |
constexpr explicit DirectInitT(Init) {} | |
}; | |
struct InPlaceInitT { | |
struct Init{}; | |
constexpr explicit InPlaceInitT(Init) {} | |
}; | |
constexpr DefaultInitT DefaultInit{DefaultInitT::Init{}}; | |
constexpr ValueInitT ValueInit{ValueInitT::Init{}}; | |
constexpr NoInitT NoInit{NoInitT::Init{}}; | |
constexpr NoCreateT NoCreate{NoCreateT::Init{}}; | |
constexpr DirectInitT DirectInit{DirectInitT::Init{}}; | |
constexpr InPlaceInitT InPlaceInit{InPlaceInitT::Init{}}; | |
}} | |
#endif | |
#ifndef CORRADE_ASSERT | |
#ifdef NDEBUG | |
#define CORRADE_ASSERT(condition, message, returnValue) do {} while(0) | |
#else | |
#define CORRADE_ASSERT(condition, message, returnValue) assert(condition) | |
#endif | |
#endif | |
#ifndef Corrade_Containers_Pointer_h | |
#define Corrade_Containers_Pointer_h | |
namespace Corrade { namespace Containers { | |
namespace Implementation { | |
template<class, class> struct PointerConverter; | |
} | |
template<class T> class Pointer { | |
static_assert(!std::is_array<T>::value, "use Containers::Array for arrays instead"); | |
public: | |
/*implicit*/ Pointer(std::nullptr_t = nullptr) noexcept: _pointer{} {} | |
explicit Pointer(T* pointer) noexcept: _pointer{pointer} {} | |
template<class ...Args> explicit Pointer(InPlaceInitT, Args&&... args): _pointer{new T{std::forward<Args>(args)...}} {} | |
template<class U, class = typename std::enable_if<std::is_base_of<T, U>::value>::type> /*implicit*/ Pointer(Pointer<U>&& other) noexcept: _pointer{other.release()} {} | |
template<class U, class = decltype(Implementation::PointerConverter<T, U>::from(std::declval<U&&>()))> /*implicit*/ Pointer(U&& other) noexcept: Pointer{Implementation::PointerConverter<T, U>::from(std::move(other))} {} | |
Pointer(const Pointer<T>&) = delete; | |
Pointer(Pointer<T>&& other) noexcept: _pointer{other._pointer} { | |
other._pointer = nullptr; | |
} | |
Pointer<T>& operator=(const Pointer<T>&) = delete; | |
Pointer<T>& operator=(Pointer<T>&& other) noexcept { | |
std::swap(_pointer, other._pointer); | |
return *this; | |
} | |
template<class U, class = decltype(Implementation::PointerConverter<T, U>::to(std::declval<Pointer<T>&&>()))> /*implicit*/ operator U() && { | |
return Implementation::PointerConverter<T, U>::to(std::move(*this)); | |
} | |
bool operator==(std::nullptr_t) const { return !_pointer; } | |
bool operator!=(std::nullptr_t) const { return _pointer; } | |
~Pointer() { delete _pointer; } | |
explicit operator bool() const { return _pointer; } | |
T* get() { return _pointer; } | |
const T* get() const { return _pointer; } | |
T* operator->() { | |
CORRADE_ASSERT(_pointer, "Containers::Pointer: the pointer is null", nullptr); | |
return _pointer; | |
} | |
const T* operator->() const { | |
CORRADE_ASSERT(_pointer, "Containers::Pointer: the pointer is null", nullptr); | |
return _pointer; | |
} | |
T& operator*() { | |
CORRADE_ASSERT(_pointer, "Containers::Pointer: the pointer is null", *_pointer); | |
return *_pointer; | |
} | |
const T& operator*() const { | |
CORRADE_ASSERT(_pointer, "Containers::Pointer: the pointer is null", *_pointer); | |
return *_pointer; | |
} | |
void reset(T* pointer = nullptr) { | |
delete _pointer; | |
_pointer = pointer; | |
} | |
template<class ...Args> T& emplace(Args&&... args) { | |
delete _pointer; | |
_pointer = new T{std::forward<Args>(args)...}; | |
return *_pointer; | |
} | |
T* release() { | |
T* const out = _pointer; | |
_pointer = nullptr; | |
return out; | |
} | |
private: | |
T* _pointer; | |
}; | |
template<class T> bool operator==(std::nullptr_t, const Pointer<T>& b) { return b == nullptr; } | |
template<class T> bool operator!=(std::nullptr_t, const Pointer<T>& b) { return b != nullptr; } | |
template<class T> inline Pointer<T> pointer(T* pointer) { | |
static_assert(!std::is_constructible<T, T*>::value, "the type is constructible from its own pointer, which is ambiguous -- explicitly use the constructor instead"); | |
return Pointer<T>{pointer}; | |
} | |
namespace Implementation { | |
template<class> struct DeducedPointerConverter; | |
} | |
template<class T> inline auto pointer(T&& other) -> decltype(Implementation::DeducedPointerConverter<T>::from(std::move(other))) { | |
return Implementation::DeducedPointerConverter<T>::from(std::move(other)); | |
} | |
template<class U, class T> Pointer<U> pointerCast(Pointer<T>&& pointer) { | |
return Pointer<U>{static_cast<U*>(pointer.release())}; | |
} | |
namespace Implementation { | |
template<class T, class ...Args> struct IsFirstAPointer: std::false_type {}; | |
template<class T> struct IsFirstAPointer<T, T*>: std::true_type {}; | |
} | |
template<class T, class ...Args> inline Pointer<T> pointer(Args&&... args) { | |
static_assert(!Implementation::IsFirstAPointer<T, Args...>::value || !std::is_constructible<T, T*>::value, "attempt to construct a type from its own pointer, which is ambiguous -- explicitly use the constructor instead"); | |
return Pointer<T>{InPlaceInit, std::forward<Args>(args)...}; | |
} | |
}} | |
#endif | |
#ifdef CORRADE_POINTER_STL_COMPATIBILITY | |
#include <memory> | |
#ifndef Corrade_Containers_PointerStl_h | |
#define Corrade_Containers_PointerStl_h | |
namespace Corrade { namespace Containers { namespace Implementation { | |
template<class T> struct PointerConverter<T, std::unique_ptr<T>> { | |
static Pointer<T> from(std::unique_ptr<T>&& other) { | |
return Pointer<T>{other.release()}; | |
} | |
static std::unique_ptr<T> to(Pointer<T>&& other) { | |
return std::unique_ptr<T>{other.release()}; | |
} | |
}; | |
template<class T> struct DeducedPointerConverter<std::unique_ptr<T>>: PointerConverter<T, std::unique_ptr<T>> {}; | |
}}} | |
#endif | |
#endif |