35 lines
872 B
C++
35 lines
872 B
C++
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// Copyright (C) 2008-2018 Lorenzo Caminiti
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// Distributed under the Boost Software License, Version 1.0 (see accompanying
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// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
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// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
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#include <limits>
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#include <cassert>
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//[introduction
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#include <boost/contract.hpp>
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void inc(int& x) {
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boost::contract::old_ptr<int> old_x = BOOST_CONTRACT_OLDOF(x); // Old value.
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boost::contract::check c = boost::contract::function()
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.precondition([&] {
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BOOST_CONTRACT_ASSERT(x < std::numeric_limits<int>::max()); // Line 17.
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})
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.postcondition([&] {
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BOOST_CONTRACT_ASSERT(x == *old_x + 1); // Line 20.
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})
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;
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++x; // Function body.
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}
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//]
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int main() {
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int x = 10;
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inc(x);
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assert(x == 11);
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return 0;
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}
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