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- #ifndef BOOST_HANA_FWD_LIFT_HPP
- #define BOOST_HANA_FWD_LIFT_HPP
- #include <boost/hana/config.hpp>
- #include <boost/hana/core/when.hpp>
- BOOST_HANA_NAMESPACE_BEGIN
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- #ifdef BOOST_HANA_DOXYGEN_INVOKED
- template <typename A>
- constexpr auto lift = [](auto&& x) {
- return tag-dispatched;
- };
- #else
- template <typename A, typename = void>
- struct lift_impl : lift_impl<A, when<true>> { };
- template <typename A>
- struct lift_t {
- template <typename X>
- constexpr auto operator()(X&& x) const;
- };
- template <typename A>
- constexpr lift_t<A> lift{};
- #endif
- BOOST_HANA_NAMESPACE_END
- #endif
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