102 lines
2.1 KiB
C++
102 lines
2.1 KiB
C++
// Copyright 2022 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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#define _CRT_SECURE_NO_WARNINGS
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#include <boost/container_hash/hash.hpp>
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#include <boost/core/detail/splitmix64.hpp>
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#include <boost/core/type_name.hpp>
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#include <boost/config.hpp>
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#include <cstddef>
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#include <cstdio>
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#include <cstdint>
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#include <string>
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#include <vector>
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#include <deque>
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#include <list>
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#include <chrono>
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// test_hash_speed
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template<class T, class V> void test_hash_speed( int N, V const& v )
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{
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std::vector<T> w;
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w.reserve( N );
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for( int i = 0; i < N; ++i )
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{
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w.emplace_back( v[i].begin(), v[i].end() );
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}
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typedef std::chrono::steady_clock clock_type;
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clock_type::time_point t1 = clock_type::now();
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std::size_t q = 0;
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boost::hash<T> const h;
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for( int i = 0; i < N; ++i )
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{
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q += h( w[i] );
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}
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clock_type::time_point t2 = clock_type::now();
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long long ms1 = std::chrono::duration_cast<std::chrono::milliseconds>( t2 - t1 ).count();
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std::string type = boost::core::type_name<T>();
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#if defined( _MSC_VER )
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std::printf( "%25s : q=%20Iu, %lld ms\n", type.c_str(), q, ms1 );
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#else
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std::printf( "%25s : q=%20zu, %lld ms\n", type.c_str(), q, ms1 );
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#endif
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}
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int main()
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{
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int const N = 1048576 * 8;
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std::vector<std::string> v;
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{
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v.reserve( N );
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boost::detail::splitmix64 rnd;
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for( int i = 0; i < N; ++i )
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{
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char buffer[ 64 ];
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unsigned long long k = rnd();
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if( k & 1 )
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{
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sprintf( buffer, "prefix_%llu_suffix", k );
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}
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else
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{
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sprintf( buffer, "{%u}", static_cast<unsigned>( k ) );
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}
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v.push_back( buffer );
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}
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}
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std::puts( "Char sequence hashing test:\n" );
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test_hash_speed< std::string >( N, v );
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test_hash_speed< std::vector<char> >( N, v );
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test_hash_speed< std::deque<char> >( N, v );
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test_hash_speed< std::list<char> >( N, v );
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std::puts( "" );
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}
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