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- #ifndef BOOST_HANA_DETAIL_INTEGRAL_CONSTANT_HPP
- #define BOOST_HANA_DETAIL_INTEGRAL_CONSTANT_HPP
- #include <boost/hana/config.hpp>
- #include <boost/hana/detail/operators/adl.hpp>
- #include <type_traits>
- namespace boost { namespace hana {
-
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- template <typename T>
- struct integral_constant_tag {
- using value_type = T;
- };
- namespace ic_detail {
- template <typename T, T v>
- struct with_index_t {
- template <typename F>
- constexpr void operator()(F&& f) const;
- };
- template <typename T, T v>
- struct times_t {
- static constexpr with_index_t<T, v> with_index{};
- template <typename F>
- constexpr void operator()(F&& f) const;
- };
- }
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- #ifdef BOOST_HANA_DOXYGEN_INVOKED
- template <typename T, T v>
- struct integral_constant {
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- template <typename F>
- static constexpr void times(F&& f) {
- f(); f(); ... f();
- }
-
- template <typename X, typename Y>
- friend constexpr auto operator+(X&& x, Y&& y);
-
- template <typename X, typename Y>
- friend constexpr auto operator-(X&& x, Y&& y);
-
- template <typename X>
- friend constexpr auto operator-(X&& x);
-
- template <typename X, typename Y>
- friend constexpr auto operator*(X&& x, Y&& y);
-
- template <typename X, typename Y>
- friend constexpr auto operator/(X&& x, Y&& y);
-
- template <typename X, typename Y>
- friend constexpr auto operator%(X&& x, Y&& y);
-
- template <typename X, typename Y>
- friend constexpr auto operator==(X&& x, Y&& y);
-
- template <typename X, typename Y>
- friend constexpr auto operator!=(X&& x, Y&& y);
-
- template <typename X, typename Y>
- friend constexpr auto operator||(X&& x, Y&& y);
-
- template <typename X, typename Y>
- friend constexpr auto operator&&(X&& x, Y&& y);
-
- template <typename X>
- friend constexpr auto operator!(X&& x);
-
- template <typename X, typename Y>
- friend constexpr auto operator<(X&& x, Y&& y);
-
- template <typename X, typename Y>
- friend constexpr auto operator>(X&& x, Y&& y);
-
- template <typename X, typename Y>
- friend constexpr auto operator<=(X&& x, Y&& y);
-
- template <typename X, typename Y>
- friend constexpr auto operator>=(X&& x, Y&& y);
- };
- #else
- template <typename T, T v>
- #ifdef BOOST_HANA_WORKAROUND_MSVC_EMPTYBASE
- struct __declspec(empty_bases) integral_constant
- #else
- struct integral_constant
- #endif
- : std::integral_constant<T, v>
- , detail::operators::adl<integral_constant<T, v>>
- {
- using type = integral_constant;
- static constexpr ic_detail::times_t<T, v> times{};
- using hana_tag = integral_constant_tag<T>;
- };
- #endif
- }}
- #endif
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