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- #ifndef BOOST_HANA_FWD_KEYS_HPP
- #define BOOST_HANA_FWD_KEYS_HPP
- #include <boost/hana/config.hpp>
- #include <boost/hana/core/when.hpp>
- BOOST_HANA_NAMESPACE_BEGIN
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- template <typename T, typename = void>
- struct keys_impl : keys_impl<T, when<true>> { };
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- struct keys_t {
- template <typename Map>
- constexpr auto operator()(Map&& map) const;
- };
- constexpr keys_t keys{};
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- #ifdef BOOST_HANA_DOXYGEN_INVOKED
- constexpr auto keys = [](auto&& object) {
- return implementation_defined;
- };
- #endif
- BOOST_HANA_NAMESPACE_END
- #endif
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