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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 <cassert>
#include <vector>
//[old_no_macro
template<typename T>
class vector {
public:
virtual void push_back(T const& value, boost::contract::virtual_* v = 0) {
// Program old value instead of using `OLD(size())` macro.
boost::contract::old_ptr<unsigned> old_size =
boost::contract::make_old(v, boost::contract::copy_old(v) ?
size() : boost::contract::null_old())
;
boost::contract::check c = boost::contract::public_function(v, this)
.postcondition([&] {
BOOST_CONTRACT_ASSERT(size() == *old_size + 1);
})
;
vect_.push_back(value);
}
/* ... */
//]
unsigned size() const { return vect_.size(); }
private:
std::vector<T> vect_;
};
int main() {
vector<int> vect;
vect.push_back(123);
assert(vect.size() == 1);
return 0;
}
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