159 lines
4.1 KiB
C++
159 lines
4.1 KiB
C++
//-----------------------------------------------------------------------------
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// boost-libs variant/test/variant_comparison_test.cpp source file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2003 Eric Friedman, Itay Maman
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// Copyright (c) 2014-2021 Antony Polukhin
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include "boost/variant/variant.hpp"
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#include "boost/core/lightweight_test.hpp"
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#include <iostream>
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#include <sstream>
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#include <string>
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#include <algorithm>
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#include <vector>
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#include "boost/detail/workaround.hpp"
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#if BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x0551))
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# pragma warn -lvc // temporary used for parameter warning
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#endif
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template <typename T>
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void assert_equality_comparable(
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const T& x, const T& y, const T& z
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)
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{
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// identity check
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BOOST_TEST( !(&x == &y) || (x == y) );
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BOOST_TEST( !(&x == &z) || (x == z) );
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BOOST_TEST( !(&y == &z) || (y == z) );
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BOOST_TEST( !(&x == &y) || !(x != y) );
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BOOST_TEST( !(&x == &z) || !(x != z) );
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BOOST_TEST( !(&y == &z) || !(y != z) );
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// reflexivity check
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BOOST_TEST( (x == x) );
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BOOST_TEST( (y == y) );
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BOOST_TEST( (z == z) );
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// symmetry check
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BOOST_TEST( !(x == y) || (y == x) );
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BOOST_TEST( !(y == x) || (x == y) );
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BOOST_TEST( (x != y) || (y == x) );
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BOOST_TEST( (y != x) || (x == y) );
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BOOST_TEST( !(x == z) || (z == x) );
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BOOST_TEST( !(z == x) || (x == z) );
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BOOST_TEST( (x != z) || (z == x) );
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BOOST_TEST( (z != x) || (x == z) );
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BOOST_TEST( !(y == z) || (z == y) );
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BOOST_TEST( !(z == y) || (y == z) );
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BOOST_TEST( (y != z) || (z == y) );
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BOOST_TEST( (z != y) || (y == z) );
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// transitivity check
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BOOST_TEST( !(x == y && y == z) || (x == z) );
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BOOST_TEST( !(x == z && z == y) || (x == y) );
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BOOST_TEST( !(y == z && z == x) || (y == x) );
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}
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template <typename T>
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void assert_less_than_comparable(
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const T& x, const T& y, const T& z
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)
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{
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// irreflexivity check
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BOOST_TEST( !(x < x) );
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BOOST_TEST( !(y < y) );
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BOOST_TEST( !(z < z) );
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BOOST_TEST( !(x > x) );
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BOOST_TEST( !(y > y) );
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BOOST_TEST( !(z > z) );
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BOOST_TEST( (x <= x) );
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BOOST_TEST( (y <= y) );
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BOOST_TEST( (z <= z) );
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BOOST_TEST( (x >= x) );
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BOOST_TEST( (y >= y) );
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BOOST_TEST( (z >= z) );
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// transitivity check
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BOOST_TEST( (x < y) );
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BOOST_TEST( (y < z) );
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BOOST_TEST( (x < z) );
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BOOST_TEST( (x <= y) );
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BOOST_TEST( (y <= z) );
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BOOST_TEST( (x <= z) );
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BOOST_TEST( (z > y) );
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BOOST_TEST( (y > x) );
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BOOST_TEST( (z > x) );
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BOOST_TEST( (z >= y) );
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BOOST_TEST( (y >= x) );
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BOOST_TEST( (z >= x) );
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// antisymmetry check
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BOOST_TEST( !(y < x) );
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BOOST_TEST( !(z < y) );
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BOOST_TEST( !(z < x) );
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}
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template <typename It>
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std::string print_range(It first, It last)
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{
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std::ostringstream result;
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while (first != last)
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{
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result << *first << ' ';
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++first;
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}
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return result.str();
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}
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int main()
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{
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typedef boost::variant<int, std::string> var_t;
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var_t var1(3);
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var_t var2(5);
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var_t var3("goodbye");
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var_t var4("hello");
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assert_equality_comparable(var1, var1, var1);
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assert_equality_comparable(var_t(var1), var_t(var1), var_t(var1));
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assert_equality_comparable(var1, var2, var3);
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assert_less_than_comparable(var1, var2, var3);
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assert_less_than_comparable(var2, var3, var4);
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std::vector<var_t> vec;
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vec.push_back( var3 );
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vec.push_back( var2 );
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vec.push_back( var4 );
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vec.push_back( var1 );
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std::sort(vec.begin(), vec.end());
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std::string sort_result( print_range(vec.begin(), vec.end()) );
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BOOST_TEST( sort_result == "3 5 goodbye hello " );
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// https://svn.boost.org/trac/boost/ticket/11751
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int a = 0, b = 0;
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boost::variant< int& > v (a), u (b);
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BOOST_TEST(v == u);
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return boost::report_errors();
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}
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