mp-units/src/include/units/bits/stdconcepts.h

// The MIT License (MIT)
//
// Copyright (c) 2018 Mateusz Pusz
//
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#pragma once

#include <ratio>
#include <type_traits>

namespace mp {

  namespace std_concepts {

    template<typename T, typename U>
    concept bool Same = std::is_same_v<T, U>;

    template<typename From, typename To>
    concept bool ConvertibleTo =
      std::is_convertible_v<From, To> &&
      requires(From (&f)()) {
        static_cast<To>(f());
      };

  }  // namespace std_concepts
}  // namespace mp