1// Copyright 2022 Peter Dimov.
2// Distributed under the Boost Software License, Version 1.0.
3// https://www.boost.org/LICENSE_1_0.txt
4
5#include <boost/utility/string_view.hpp>
6#include <boost/core/detail/string_view.hpp>
7#include <boost/container_hash/hash.hpp>
8#include <boost/core/lightweight_test.hpp>
9#include <boost/config.hpp>
10#include <string>
11#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
12#include <string_view>
13#endif
14#include <vector>
15#include <deque>
16#include <list>
17#if !defined(BOOST_NO_CXX11_HDR_FORWARD_LIST)
18# include <forward_list>
19#endif
20
21// Test whether the hash values of a string and a
22// string_view that refers to it match. This is
23// important for unordered heterogeneous lookups.
24
25template<class T> std::size_t hv( T const& t )
26{
27 return boost::hash<T>()( t );
28}
29
30int main()
31{
32 std::string s( "Test." );
33 std::size_t h0 = hv( t: s );
34
35 BOOST_TEST_EQ( h0, hv( boost::string_view( s ) ) );
36 BOOST_TEST_EQ( h0, hv( boost::core::string_view( s ) ) );
37
38#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
39 BOOST_TEST_EQ( h0, hv( std::string_view( s ) ) );
40#endif
41
42 BOOST_TEST_EQ( h0, hv( std::vector<char>( s.begin(), s.end() ) ) );
43 BOOST_TEST_EQ( h0, hv( std::deque<char>( s.begin(), s.end() ) ) );
44 BOOST_TEST_EQ( h0, hv( std::list<char>( s.begin(), s.end() ) ) );
45
46#if !defined(BOOST_NO_CXX11_HDR_FORWARD_LIST)
47 BOOST_TEST_EQ( h0, hv( std::forward_list<char>( s.begin(), s.end() ) ) );
48#endif
49
50 return boost::report_errors();
51}
52

source code of boost/libs/container_hash/test/hash_string_test2.cpp