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- //-----------------------------------------------------------------------------
- // boost-libs variant/test/variant_comparison_test.cpp source file
- // See http://www.boost.org for updates, documentation, and revision history.
- //-----------------------------------------------------------------------------
- //
- // Copyright (c) 2003 Eric Friedman, Itay Maman
- // Copyright (c) 2014-2019 Antony Polukhin
- //
- // 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 "boost/variant/variant.hpp"
- #include "boost/core/lightweight_test.hpp"
- #include <iostream>
- #include <sstream>
- #include <string>
- #include <algorithm>
- #include <vector>
- #include "boost/detail/workaround.hpp"
- #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x0551))
- # pragma warn -lvc // temporary used for parameter warning
- #endif
- template <typename T>
- void assert_equality_comparable(
- const T& x, const T& y, const T& z
- )
- {
- // identity check
- BOOST_TEST( !(&x == &y) || (x == y) );
- BOOST_TEST( !(&x == &z) || (x == z) );
- BOOST_TEST( !(&y == &z) || (y == z) );
- BOOST_TEST( !(&x == &y) || !(x != y) );
- BOOST_TEST( !(&x == &z) || !(x != z) );
- BOOST_TEST( !(&y == &z) || !(y != z) );
- // reflexivity check
- BOOST_TEST( (x == x) );
- BOOST_TEST( (y == y) );
- BOOST_TEST( (z == z) );
- // symmetry check
- BOOST_TEST( !(x == y) || (y == x) );
- BOOST_TEST( !(y == x) || (x == y) );
- BOOST_TEST( (x != y) || (y == x) );
- BOOST_TEST( (y != x) || (x == y) );
- BOOST_TEST( !(x == z) || (z == x) );
- BOOST_TEST( !(z == x) || (x == z) );
- BOOST_TEST( (x != z) || (z == x) );
- BOOST_TEST( (z != x) || (x == z) );
- BOOST_TEST( !(y == z) || (z == y) );
- BOOST_TEST( !(z == y) || (y == z) );
- BOOST_TEST( (y != z) || (z == y) );
- BOOST_TEST( (z != y) || (y == z) );
- // transitivity check
- BOOST_TEST( !(x == y && y == z) || (x == z) );
- BOOST_TEST( !(x == z && z == y) || (x == y) );
- BOOST_TEST( !(y == z && z == x) || (y == x) );
- }
- template <typename T>
- void assert_less_than_comparable(
- const T& x, const T& y, const T& z
- )
- {
- // irreflexivity check
- BOOST_TEST( !(x < x) );
- BOOST_TEST( !(y < y) );
- BOOST_TEST( !(z < z) );
- BOOST_TEST( !(x > x) );
- BOOST_TEST( !(y > y) );
- BOOST_TEST( !(z > z) );
- BOOST_TEST( (x <= x) );
- BOOST_TEST( (y <= y) );
- BOOST_TEST( (z <= z) );
- BOOST_TEST( (x >= x) );
- BOOST_TEST( (y >= y) );
- BOOST_TEST( (z >= z) );
- // transitivity check
- BOOST_TEST( (x < y) );
- BOOST_TEST( (y < z) );
- BOOST_TEST( (x < z) );
- BOOST_TEST( (x <= y) );
- BOOST_TEST( (y <= z) );
- BOOST_TEST( (x <= z) );
- BOOST_TEST( (z > y) );
- BOOST_TEST( (y > x) );
- BOOST_TEST( (z > x) );
- BOOST_TEST( (z >= y) );
- BOOST_TEST( (y >= x) );
- BOOST_TEST( (z >= x) );
- // antisymmetry check
- BOOST_TEST( !(y < x) );
- BOOST_TEST( !(z < y) );
- BOOST_TEST( !(z < x) );
- }
- template <typename It>
- std::string print_range(It first, It last)
- {
- std::ostringstream result;
- while (first != last)
- {
- result << *first << ' ';
- ++first;
- }
- return result.str();
- }
- int main()
- {
- typedef boost::variant<int, std::string> var_t;
-
- var_t var1(3);
- var_t var2(5);
- var_t var3("goodbye");
- var_t var4("hello");
- assert_equality_comparable(var1, var1, var1);
- assert_equality_comparable(var_t(var1), var_t(var1), var_t(var1));
- assert_equality_comparable(var1, var2, var3);
- assert_less_than_comparable(var1, var2, var3);
- assert_less_than_comparable(var2, var3, var4);
- std::vector<var_t> vec;
- vec.push_back( var3 );
- vec.push_back( var2 );
- vec.push_back( var4 );
- vec.push_back( var1 );
- std::sort(vec.begin(), vec.end());
- std::string sort_result( print_range(vec.begin(), vec.end()) );
- BOOST_TEST( sort_result == "3 5 goodbye hello " );
- // https://svn.boost.org/trac/boost/ticket/11751
- int a = 0, b = 0;
- boost::variant< int& > v (a), u (b);
- BOOST_TEST(v == u);
- return boost::report_errors();
- }
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