94e7c0b051
Works towards P0619R4 / #99985. The use of `std::get_temporary_buffer` and `std::return_temporary_buffer` are replaced with `unique_ptr`-based RAII buffer holder. Escape hatches: - `_LIBCPP_ENABLE_CXX20_REMOVED_TEMPORARY_BUFFER` restores `std::get_temporary_buffer` and `std::return_temporary_buffer`. Drive-by changes: - In `<syncstream>`, states that `get_temporary_buffer` is now removed, because `<syncstream>` is added in C++20.
44 lines
1.1 KiB
C++
44 lines
1.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03
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// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX20_REMOVED_TEMPORARY_BUFFER
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// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
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// <memory>
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// template <class T>
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// pair<T*, ptrdiff_t>
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// get_temporary_buffer(ptrdiff_t n);
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//
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// template <class T>
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// void
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// return_temporary_buffer(T* p);
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#include <cassert>
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#include <cstdint>
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#include <memory>
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#include <utility>
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#include "test_macros.h"
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struct alignas(32) A {
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int field;
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};
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int main(int, char**)
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{
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std::pair<A*, std::ptrdiff_t> ip = std::get_temporary_buffer<A>(5);
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assert(!(ip.first == nullptr) ^ (ip.second == 0));
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assert(reinterpret_cast<std::uintptr_t>(ip.first) % alignof(A) == 0);
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std::return_temporary_buffer(ip.first);
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return 0;
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}
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