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#pragma once is a widely supported compiler pragma, even though it is not part of the C++ standard. Many of the issues keeping #pragma once from being standardized (distributed filesystems, build farms, hard links, etc.) do not apply to CMake - it is easy to build CMake on a single machine. CMake also does not install any header files which can be consumed by other projects (though cmCPluginAPI.h has been deliberately omitted from this conversion in case anyone is still using it.) Finally, #pragma once has been required to build CMake since at least August 2017 (7f29bbe6enabled server mode unconditionally, which had been using #pragma once since September 2016 (b13d3e0d)). The fact that we now require C++11 filters out old compilers, and it is unlikely that there is a compiler which supports C++11 but does not support #pragma once.
68 lines
1.3 KiB
C++
68 lines
1.3 KiB
C++
// -*-c++-*-
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// vim: set ft=cpp:
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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#pragma once
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#include "cmSTL.hxx" // IWYU pragma: keep
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#include <memory> // IWYU pragma: export
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#if !defined(CMake_HAVE_CXX_MAKE_UNIQUE)
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# include <cstddef>
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# include <type_traits>
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# include <utility>
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#endif
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namespace cm {
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#if defined(CMake_HAVE_CXX_MAKE_UNIQUE)
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using std::make_unique;
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#else
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namespace internals {
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template <typename T>
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struct make_unique_if
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{
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using single = std::unique_ptr<T>;
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};
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template <typename T>
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struct make_unique_if<T[]>
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{
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using unbound_array = std::unique_ptr<T[]>;
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};
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template <typename T, std::size_t N>
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struct make_unique_if<T[N]>
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{
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using bound_array = void;
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};
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}
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template <typename T, typename... Args>
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typename internals::make_unique_if<T>::single make_unique(Args&&... args)
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{
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return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
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}
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template <typename T>
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typename internals::make_unique_if<T>::unbound_array make_unique(std::size_t n)
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{
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using E = typename std::remove_extent<T>::type;
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return std::unique_ptr<T>(new E[n]());
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}
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template <typename T, typename... Args>
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typename internals::make_unique_if<T>::bound_array make_unique(Args&&...) =
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delete;
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#endif
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} // namespace cm
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