41 lines
1.1 KiB
C++
41 lines
1.1 KiB
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 <boost/contract.hpp>
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#include <vector>
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#include <algorithm>
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#include <limits>
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int main() {
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std::vector<int> v;
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v.push_back(1);
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v.push_back(2);
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v.push_back(3);
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//[loop
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int total = 0;
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// Contract for a for-loop (same for while- and all other loops).
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for(std::vector<int>::const_iterator i = v.begin(); i != v.end(); ++i) {
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boost::contract::old_ptr<int> old_total = BOOST_CONTRACT_OLDOF(total);
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boost::contract::check c = boost::contract::function()
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.precondition([&] {
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BOOST_CONTRACT_ASSERT(
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total < std::numeric_limits<int>::max() - *i);
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})
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.postcondition([&] {
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BOOST_CONTRACT_ASSERT(total == *old_total + *i);
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})
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;
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total += *i; // For-loop body.
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}
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//]
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assert(total == 6);
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return 0;
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}
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