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46 lines
1.0 KiB
C++
46 lines
1.0 KiB
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/siphash.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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private:
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H h_;
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public:
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hash( unsigned char const* p, std::size_t n ): h_( p, n )
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{
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}
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std::size_t operator()( T const& v ) const
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{
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H 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.result() );
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}
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};
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int main()
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{
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unsigned char const seed[ 16 ] =
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{
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0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
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0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10
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};
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using hasher = hash<std::string, boost::hash2::siphash_64>;
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boost::unordered_flat_map<std::string, int, hasher> map( 0, hasher( seed, sizeof(seed) ) );
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map[ "foo" ] = 1;
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map[ "bar" ] = 2;
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}
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