================ @@ -0,0 +1,102 @@ +// -*- 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___INOUT_PTR_H +#define _LIBCPP___INOUT_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_same.h> +#include <__type_traits/is_specialization.h> +#include <__type_traits/is_void.h> +#include <tuple> + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +# pragma GCC system_header +#endif + +_LIBCPP_BEGIN_NAMESPACE_STD + +#if _LIBCPP_STD_VER >= 23 + +template <class _Smart, class _Pointer, class... _Args> +class _LIBCPP_TEMPLATE_VIS inout_ptr_t { + static_assert(!__is_specialization_v<_Smart, shared_ptr>, "std::shared_ptr<> is not supported"); + +public: + _LIBCPP_HIDE_FROM_ABI explicit inout_ptr_t(_Smart& __s, _Args... __args) + : __s_(__s), __a_(std::forward<_Args>(__args)...), __p_([&__s] { + if constexpr (is_pointer_v<_Smart>) { + return __s; + } else { + return __s.get(); + } + }()) { + if constexpr (requires { __s.release(); }) { + __s.release(); + } else { + __s = _Smart(); + } + } + + _LIBCPP_HIDE_FROM_ABI inout_ptr_t(const inout_ptr_t&) = delete; + + _LIBCPP_HIDE_FROM_ABI ~inout_ptr_t() { + if constexpr (!is_pointer_v<_Smart>) { + if (!__p_) { + return; + } + } + + using _SP = __pointer_of_or_t<_Smart, _Pointer>; + if constexpr (is_pointer_v<_Smart>) { + std::apply([&](auto&&... __args) { __s_ = _Smart(static_cast<_SP>(__p_), std::forward<_Args>(__args)...); }, + std::move(__a_)); + } else 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 if constexpr (is_constructible_v<_Smart, _SP, _Args...>) { + std::apply([&](auto&&... __args) { __s_ = _Smart(static_cast<_SP>(__p_), std::forward<_Args>(__args)...); }, + std::move(__a_)); + } else { + static_assert(is_pointer_v<_Smart> || __resettable_smart_pointer_with_args<_Smart, _Pointer, _Args...> || + is_constructible_v<_Smart, _SP, _Args...>); + } + } + + _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>); + + return reinterpret_cast<void**>(static_cast<_Pointer*>(*this)); + } + +private: + _Smart& __s_; + tuple<_Args...> __a_; + _Pointer __p_; +}; + +template <class _Pointer = void, class _Smart, class... _Args> +_LIBCPP_HIDE_FROM_ABI auto inout_ptr(_Smart& __s, _Args&&... __args) { + using _Ptr = conditional_t<is_void_v<_Pointer>, __pointer_of_t<_Smart>, _Pointer>; + return std::inout_ptr_t<_Smart, _Ptr, _Args&&...>(__s, std::forward<_Args>(__args)...); ---------------- H-G-Hristov wrote:
Maybe I don't understand but the following fails to compile: https://godbolt.org/z/cseMEfdj5 > opt/compiler-explorer/gcc-trunk-20240117/include/c++/14.0.1/bits/out_ptr.h:212:42: > error: use of deleted function 'constexpr Foo& Foo::operator=(const Foo&)' 212 | _M_smart._M_t._M_deleter() = std::forward<_Del2>(_M_del); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ```c++ #include <memory> #include <tuple> struct Foo { Foo() = default; Foo(Foo const&) = delete; // not copyable Foo(Foo&&) = delete; // not movable either! void operator()(int*) {}; }; int main() { std::unique_ptr<int, Foo> smart; Foo arg; // std::ignore = std::out_ptr(smart, arg); std::ignore = std::inout_ptr(smart, arg); } ``` https://github.com/llvm/llvm-project/pull/73618 _______________________________________________ lldb-commits mailing list lldb-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
