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// Copyright (C) 2008-2018 Lorenzo Caminiti
// Distributed under the Boost Software License, Version 1.0 (see accompanying
// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
//[n1962_equal
#include <boost/contract.hpp>
#include <cassert>
// Forward declaration because == and != contracts use one another's function.
template<typename T>
bool operator==(T const& left, T const& right);
template<typename T>
bool operator!=(T const& left, T const& right) {
bool result;
boost::contract::check c = boost::contract::function()
.postcondition([&] {
BOOST_CONTRACT_ASSERT(result == !(left == right));
})
;
return result = (left.value != right.value);
}
template<typename T>
bool operator==(T const& left, T const& right) {
bool result;
boost::contract::check c = boost::contract::function()
.postcondition([&] {
BOOST_CONTRACT_ASSERT(result == !(left != right));
})
;
return result = (left.value == right.value);
}
struct number { int value; };
int main() {
number n;
n.value = 123;
assert((n == n) == true); // Explicitly call operator==.
assert((n != n) == false); // Explicitly call operator!=.
return 0;
}
//]
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