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