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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
- #include <boost/contract.hpp>
- #include <vector>
- #include <algorithm>
- #include <limits>
- int main() {
- std::vector<int> v;
- v.push_back(1);
- v.push_back(2);
- v.push_back(3);
- //[lambda
- int total = 0;
- std::for_each(v.cbegin(), v.cend(),
- // Contract for a lambda function.
- [&total] (int const x) {
- boost::contract::old_ptr<int> old_total =
- BOOST_CONTRACT_OLDOF(total);
- boost::contract::check c = boost::contract::function()
- .precondition([&] {
- BOOST_CONTRACT_ASSERT(
- total < std::numeric_limits<int>::max() - x);
- })
- .postcondition([&] {
- BOOST_CONTRACT_ASSERT(total == *old_total + x);
- })
- ;
- total += x; // Lambda function body.
- }
- );
- //]
- assert(total == 6);
- return 0;
- }
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