44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
|
|
// 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;
|
|
}
|
|
|