Simon Rozman
308f63490c
These files are C++ only. They should either have no extension like standard C++ headers (which is cumbersome on Windows environments), or .hpp. .h is used for C and hybrid C/C++ headers. Signed-off-by: Simon Rozman <simon@rozman.si>
53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
/*
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SPDX-License-Identifier: MIT
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Copyright © 2023 Amebis
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*/
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#pragma once
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#include <memory>
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namespace stdex
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{
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///
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/// Noop deleter
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///
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template <class T>
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struct no_delete {
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constexpr no_delete() noexcept = default;
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template <class T2, std::enable_if_t<std::is_convertible_v<T2*, T*>, int> = 0>
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inline no_delete(const no_delete<T2>&) noexcept {}
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inline void operator()(T* p) const noexcept { p; }
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};
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///
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/// Noop array deleter
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///
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template <class T>
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struct no_delete<T[]> {
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constexpr no_delete() noexcept = default;
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template <class _Uty, std::enable_if_t<std::is_convertible_v<_Uty(*)[], T(*)[]>, int> = 0>
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inline no_delete(const no_delete<_Uty[]>&) noexcept {}
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template <class _Uty, std::enable_if_t<std::is_convertible_v<_Uty(*)[], T(*)[]>, int> = 0>
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inline void operator()(_Uty* p) const noexcept { p; }
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};
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///
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/// Create shared_ptr with noop deleter.
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///
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/// This may be used to wrap data on stack in a shared_ptr. However, be extra careful
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/// that shared_ptr is completely dereferenced _before_ stack data goes out of scope.
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///
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/// \param[in] p Pointer to assign to shared_ptr
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///
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template <class T>
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inline std::shared_ptr<T> make_shared_no_delete(_In_ T* p)
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{
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return std::shared_ptr<T>(p, no_delete<T>{});
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}
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}
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