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

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Addresses #303
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Nick Krichevsky 2021-10-05 10:56:58 -04:00
parent 5eca8a3001
commit 1bf360c037
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1 changed files with 9 additions and 4 deletions
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11
include/cxxopts.hpp
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@ -51,9 +51,14 @@ THE SOFTWARE.
# include <regex> # include <regex>
#endif // CXXOPTS_NO_REGEX #endif // CXXOPTS_NO_REGEX
#ifdef __cpp_lib_optional // Nonstandard before C++17, which is coincidentally what we also need for <optional>
#include <optional> #ifdef __has_include
#define CXXOPTS_HAS_OPTIONAL # if __has_include(<optional>)
# include <optional>
# ifdef __cpp_lib_optional
# define CXXOPTS_HAS_OPTIONAL
# endif
# endif
#endif #endif
#if __cplusplus >= 201603L #if __cplusplus >= 201603L