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🐛 Fix concepts when C++ standard library is lacking #116

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Merged
elbeno merged 1 commit into from
Jun 25, 2024
Merged

🐛 Fix concepts when C++ standard library is lacking #116

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22 changes: 11 additions & 11 deletions include/stdx/concepts.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@

#if __cpp_lib_concepts < 202002L

#include <functional>
#include <type_traits>
#include <utility>

Expand Down Expand Up @@ -154,23 +155,22 @@ concept totally_ordered =
equality_comparable<T> and detail::partially_ordered<T>;

template <typename F, typename... Args>
concept invocable =
requires(F &&f, Args &&...args) {
std::invoke(std::forward<F>(f), std::forward<Args>(args)...);
}
concept invocable = requires(F &&f, Args &&...args) {
std::invoke(std::forward<F>(f), std::forward<Args>(args)...);
};

namespace detail {
template <typename B>
concept boolean_testable_impl = stdx::convertible_to<B, bool>;
template <typename B>
concept boolean_testable_impl = stdx::convertible_to<B, bool>;

template <typename B>
concept boolean_testable = boolean_testable_impl<B> and requires(B &&b) {
{ not std::forward<B>(b) } -> boolean_testable_impl;
};
template <typename B>
concept boolean_testable = boolean_testable_impl<B> and requires(B &&b) {
{ not std::forward<B>(b) } -> boolean_testable_impl;
};
} // namespace detail

template <typename F, typename... Args>
concept predicate = invocable<F, Args> and
concept predicate = invocable<F, Args...> and
detail::boolean_testable<std::invoke_result_t<F, Args...>>;

template <typename T>
Expand Down