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add additional check for invocability

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Philip Top
2019-12-19 12:22:42 -08:00
committed by Philip Top
parent 605cd8ef4a
commit acad8b1a61
1 changed files with 1 additions and 1 deletions
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toml/traits.hpp
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@@ -282,7 +282,7 @@ using enable_if_t = typename std::enable_if<B, T>::type;
// --------------------------------------------------------------------------- // ---------------------------------------------------------------------------
// return_type_of_t // return_type_of_t
#if __cplusplus >= 201703L #if __cplusplus >= 201703L && defined(__cpp_lib_is_invocable) && __cpp_lib_is_invokable>=201710
template<typename F, typename ... Args> template<typename F, typename ... Args>
using return_type_of_t = std::invoke_result_t<F, Args...>; using return_type_of_t = std::invoke_result_t<F, Args...>;