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- #ifndef BOOST_HANA_FWD_HASH_HPP
- #define BOOST_HANA_FWD_HASH_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
- constexpr auto hash = [](auto const& x) {
- return tag-dispatched;
- };
- #else
- template <typename T, typename = void>
- struct hash_impl : hash_impl<T, when<true>> { };
- struct hash_t {
- template <typename X>
- constexpr auto operator()(X const& x) const;
- };
- constexpr hash_t hash{};
- #endif
- BOOST_HANA_NAMESPACE_END
- #endif
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