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32 lines
746 B
C++
32 lines
746 B
C++
// Copyright 2024 Peter Dimov
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <boost/hash2/fnv1a.hpp>
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#include <boost/hash2/hash_append.hpp>
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#include <boost/hash2/get_integral_result.hpp>
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#include <boost/unordered/unordered_flat_map.hpp>
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#include <string>
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template<class T, class H> class hash
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{
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public:
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std::size_t operator()( T const& v ) const
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{
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H h;
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boost::hash2::hash_append( h, {}, v );
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return boost::hash2::get_integral_result<std::size_t>( h );
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}
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};
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int main()
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{
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using hasher = hash<std::string, boost::hash2::fnv1a_64>;
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boost::unordered_flat_map<std::string, int, hasher> map;
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map[ "foo" ] = 1;
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map[ "bar" ] = 2;
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}
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