mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-12 01:08:00 +00:00
101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP___OUT_PTR_H
|
|
#define _LIBCPP___OUT_PTR_H
|
|
|
|
#include <__config>
|
|
#include <__memory/addressof.h>
|
|
#include <__memory/pointer_traits.h>
|
|
#include <__memory/shared_ptr.h>
|
|
#include <__memory/unique_ptr.h>
|
|
#include <__type_traits/is_specialization.h>
|
|
#include <__type_traits/is_void.h>
|
|
#include <__utility/forward.h>
|
|
#include <__utility/move.h>
|
|
#include <tuple>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_PUSH_MACROS
|
|
#include <__undef_macros>
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
#if _LIBCPP_STD_VER >= 23
|
|
|
|
template <class _Smart, class _Pointer, class... _Args>
|
|
class _LIBCPP_TEMPLATE_VIS out_ptr_t {
|
|
static_assert(!__is_specialization_v<_Smart, shared_ptr> || sizeof...(_Args) > 0,
|
|
"Using std::shared_ptr<> without a deleter in std::out_ptr is not supported.");
|
|
|
|
public:
|
|
_LIBCPP_HIDE_FROM_ABI explicit out_ptr_t(_Smart& __smart, _Args... __args)
|
|
: __s_(__smart), __a_(std::forward<_Args>(__args)...), __p_() {
|
|
using _Ptr = decltype(__smart);
|
|
if constexpr (__resettable_smart_pointer<_Ptr>) {
|
|
__s_.reset();
|
|
} else if constexpr (is_constructible_v<_Smart>) {
|
|
__s_ = _Smart();
|
|
} else {
|
|
static_assert(__resettable_smart_pointer<_Ptr> || is_constructible_v<_Smart>,
|
|
"The adapted pointer type must have a reset() member function or be default constructible.");
|
|
}
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI out_ptr_t(const out_ptr_t&) = delete;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI ~out_ptr_t() {
|
|
if (!__p_) {
|
|
return;
|
|
}
|
|
|
|
using _SP = __pointer_of_or_t<_Smart, _Pointer>;
|
|
if constexpr (__resettable_smart_pointer_with_args<_Smart, _Pointer, _Args...>) {
|
|
std::apply([&](auto&&... __args) { __s_.reset(static_cast<_SP>(__p_), std::forward<_Args>(__args)...); },
|
|
std::move(__a_));
|
|
} else {
|
|
static_assert(is_constructible_v<_Smart, _SP, _Args...>,
|
|
"The smart pointer must be constructible from arguments of types _Smart, _Pointer, _Args...");
|
|
std::apply([&](auto&&... __args) { __s_ = _Smart(static_cast<_SP>(__p_), std::forward<_Args>(__args)...); },
|
|
std::move(__a_));
|
|
}
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI operator _Pointer*() const noexcept { return std::addressof(const_cast<_Pointer&>(__p_)); }
|
|
|
|
_LIBCPP_HIDE_FROM_ABI operator void**() const noexcept
|
|
requires(!is_same_v<_Pointer, void*>)
|
|
{
|
|
static_assert(is_pointer_v<_Pointer>, "The conversion to void** requires _Pointer to be a raw pointer.");
|
|
|
|
return reinterpret_cast<void**>(static_cast<_Pointer*>(*this));
|
|
}
|
|
|
|
private:
|
|
_Smart& __s_;
|
|
tuple<_Args...> __a_;
|
|
_Pointer __p_ = _Pointer();
|
|
};
|
|
|
|
template <class _Pointer = void, class _Smart, class... _Args>
|
|
_LIBCPP_HIDE_FROM_ABI auto out_ptr(_Smart& __s, _Args&&... __args) {
|
|
using _Ptr = conditional_t<is_void_v<_Pointer>, __pointer_of_t<_Smart>, _Pointer>;
|
|
return std::out_ptr_t<_Smart, _Ptr, _Args&&...>(__s, std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
#endif // _LIBCPP_STD_VER >= 23
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
_LIBCPP_POP_MACROS
|
|
|
|
#endif // _LIBCPP___OUT_PTR_H
|