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5132044bc4
* [clipp] Add patch to fix std::result_of deprecated in C++20 * x-add-version * Modify version-string to version-date * x-add-version * Add upstream PR comment. * Version DB Co-authored-by: Billy Robert O'Neal III <bion@microsoft.com>
48 lines
1.6 KiB
Diff
48 lines
1.6 KiB
Diff
diff --git a/include/clipp.h b/include/clipp.h
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index d7b101e..a1bec2d 100644
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--- a/include/clipp.h
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+++ b/include/clipp.h
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@@ -155,16 +155,27 @@ namespace traits {
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* @brief function (class) signature type trait
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*
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*****************************************************************************/
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+#if defined(__cpp_lib_is_invocable)
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template<class Fn, class Ret, class... Args>
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constexpr auto
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check_is_callable(int) -> decltype(
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std::declval<Fn>()(std::declval<Args>()...),
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std::integral_constant<bool,
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- std::is_same<Ret,typename std::result_of<Fn(Args...)>::type>::value>{} );
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+ std::is_same<Ret,typename std::invoke_result<Fn,Args...>::type>::value>{} );
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-template<class,class,class...>
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+template<class Fn, class Ret>
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constexpr auto
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-check_is_callable(long) -> std::false_type;
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+check_is_callable_without_arg(int) -> decltype(
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+ std::declval<Fn>()(),
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+ std::integral_constant<bool,
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+ std::is_same<Ret,typename std::invoke_result<Fn>::type>::value>{} );
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+#else
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+template<class Fn, class Ret, class... Args>
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+constexpr auto
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+check_is_callable(int) -> decltype(
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+ std::declval<Fn>()(std::declval<Args>()...),
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+ std::integral_constant<bool,
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+ std::is_same<Ret,typename std::result_of<Fn(Args...)>::type>::value>{} );
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template<class Fn, class Ret>
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constexpr auto
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@@ -172,6 +183,11 @@ check_is_callable_without_arg(int) -> decltype(
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std::declval<Fn>()(),
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std::integral_constant<bool,
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std::is_same<Ret,typename std::result_of<Fn()>::type>::value>{} );
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+#endif
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+
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+template<class,class,class...>
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+constexpr auto
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+check_is_callable(long) -> std::false_type;
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template<class,class>
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constexpr auto
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