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// Copyright 2018 Daniel James
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#include "./config.hpp"
#ifndef BOOST_HASH_TEST_STD_INCLUDES
# include <boost/container_hash/hash.hpp>
#endif
#include <boost/config.hpp>
#include <boost/core/lightweight_test.hpp>
#if !defined(BOOST_NO_CXX17_HDR_VARIANT)
#include <variant>
#include <string>
void test_monostate()
{
std::monostate x1;
std::monostate x2;
boost::hash<std::monostate> hasher;
BOOST_TEST(hasher(x1) == hasher(x2));
}
void test_variant_int()
{
std::variant<std::monostate, int> x1a;
std::variant<std::monostate, int> x1b;
std::variant<std::monostate, int> x2a(10);
std::variant<std::monostate, int> x2b(x2a);
std::variant<std::monostate, int> x3(20);
boost::hash<std::variant<std::monostate, int> > hasher;
BOOST_TEST(hasher(x1a) == hasher(x1a));
BOOST_TEST(hasher(x1a) == hasher(x1b));
BOOST_TEST(hasher(x1a) != hasher(x2a));
BOOST_TEST(hasher(x1a) != hasher(x3));
BOOST_TEST(hasher(x2a) == hasher(x2a));
BOOST_TEST(hasher(x2b) == hasher(x2b));
BOOST_TEST(hasher(x2a) != hasher(x3));
BOOST_TEST(hasher(x3) == hasher(x3));
}
struct custom1 {
int value;
friend std::size_t hash_value(custom1 v) { return boost::hash_value(v.value); }
};
struct custom2 {
int value;
friend std::size_t hash_value(custom2 v) { return boost::hash_value(v.value); }
};
void test_variant_unique_types()
{
custom1 x11 = { 0 };
custom1 x12 = { 1 };
custom2 x21 = { 0 };
custom2 x22 = { 1 };
boost::hash<custom1> hasher1;
boost::hash<custom2> hasher2;
BOOST_TEST(hasher1(x11) == hasher2(x21));
BOOST_TEST(hasher1(x11) != hasher2(x22));
BOOST_TEST(hasher1(x12) != hasher2(x21));
BOOST_TEST(hasher1(x12) == hasher2(x22));
typedef std::variant<custom1, custom2> variant_type;
variant_type y11(x11);
variant_type y12(x12);
variant_type y21(x21);
variant_type y22(x22);
boost::hash<variant_type> hasher;
BOOST_TEST(hasher(y11) != hasher(y21));
BOOST_TEST(hasher(y11) != hasher(y22));
BOOST_TEST(hasher(y12) != hasher(y21));
BOOST_TEST(hasher(y12) != hasher(y22));
}
#endif
int main()
{
#if !defined(BOOST_NO_CXX17_HDR_VARIANT)
test_variant_int();
test_variant_unique_types();
#else
BOOST_LIGHTWEIGHT_TEST_OSTREAM << "<variant> not available." << std::endl;
#endif
return boost::report_errors();
}
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