External/cxxopts
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Include <optional> if possible to check if we can use the feature (#309)

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Fixes #303
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Nick Krichevsky 2021-10-09 22:01:47 -04:00 committed by GitHub
parent c641241a87
commit 4a02ad94f4
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1 changed files with 9 additions and 4 deletions
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7
include/cxxopts.hpp
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@ -51,10 +51,15 @@ THE SOFTWARE.
# include <regex>
#endif // CXXOPTS_NO_REGEX
#ifdef __cpp_lib_optional
// Nonstandard before C++17, which is coincidentally what we also need for <optional>
#ifdef __has_include
# if __has_include(<optional>)
# include <optional>
# ifdef __cpp_lib_optional
# define CXXOPTS_HAS_OPTIONAL
# endif
# endif
#endif
#if __cplusplus >= 201603L
#define CXXOPTS_NODISCARD [[nodiscard]]