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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 BOOST_HASH_HAS_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 BOOST_HASH_HAS_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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