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Added workaround for non-constexpr std::exchange

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Herb Sutter 2020-12-18 12:02:42 -08:00
parent 248a7cbdce
commit 0c5a66b666
1 changed files with 8 additions and 0 deletions
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8
include/gsl/assert
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@ -114,7 +114,15 @@ public:
#else
constexpr contract_group (handler h) : chandler(h ? h : []()noexcept{}) { }
#endif
#if __cplusplus >= 202002L
constexpr auto set_handler(handler h) -> handler { return std::exchange(chandler, h ? h : []()noexcept{}); }
#else
constexpr auto set_handler(handler h) -> handler { auto old = chandler;
chandler = h ? h : []()noexcept{};
return old;
}
#endif
constexpr auto get_handler() -> handler { return chandler; }
constexpr void expects (bool b) { assertion(b); }