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bdca8b01d2
#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.
40 lines
989 B
C++
40 lines
989 B
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 <cstddef>
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#include <cm/string_view>
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namespace cm {
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/** A string_view that only binds to static storage.
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*
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* This is used together with the `""_s` user-defined literal operator
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* to construct a type-safe abstraction of a string_view that only views
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* statically allocated strings. These strings are const and available
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* for the entire lifetime of the program.
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*/
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class static_string_view : public string_view
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{
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static_string_view(string_view v)
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: string_view(v)
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{
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}
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friend static_string_view operator"" _s(const char* data, size_t size);
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};
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/** Create a static_string_view using `""_s` literal syntax. */
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inline static_string_view operator"" _s(const char* data, size_t size)
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{
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return string_view(data, size);
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}
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} // namespace cm
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using cm::operator"" _s;
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