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92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
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// Copyright (C) 2008-2015 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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// Home at http://www.boost.org/libs/contract
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#include <boost/detail/lightweight_test.hpp>
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template<typename T>
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class pushable;
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//[introduction
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#include <boost/contract.hpp>
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#include <vector>
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#include <cstddef>
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template<typename T>
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class vector
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#define BASES public pushable<T>
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: BASES
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{
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public:
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typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types; // Subcontracting.
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#undef BASES
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void invariant() const { // Checked in AND with base class invariants.
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BOOST_CONTRACT_ASSERT(size() <= capacity()); // Line 27.
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}
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virtual void push_back(T const& value, boost::contract::virtual_* v = 0)
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/* override */ {
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boost::contract::old_ptr<std::size_t> old_size =
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BOOST_CONTRACT_OLDOF(v, size()); // Old values.
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boost::contract::guard c = boost::contract::public_function<
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override_push_back>(v, &vector::push_back, this, value)
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.precondition([&] { // Checked in OR with base preconditions.
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BOOST_CONTRACT_ASSERT(size() < max_size()); // Line 36.
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})
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.postcondition([&] { // Checked in AND with base postconditions.
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BOOST_CONTRACT_ASSERT(size() == *old_size + 1); // Line 39.
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})
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;
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vect_.push_back(value);
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}
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BOOST_CONTRACT_OVERRIDE(push_back)
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std::size_t size() const { return vect_.size(); }
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std::size_t max_size() const { return vect_.max_size(); }
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std::size_t capacity() const { return vect_.capacity(); }
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private:
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std::vector<T> vect_;
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};
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//]
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template<typename T>
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class pushable {
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public:
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void invariant() const {
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BOOST_CONTRACT_ASSERT(capacity() <= max_size());
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}
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virtual void push_back(T const& value, boost::contract::virtual_* v = 0)
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= 0;
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virtual std::size_t max_size() const = 0;
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virtual std::size_t capacity() const = 0;
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};
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template<typename T> // Contract for pure virtual function.
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void pushable<T>::push_back(T const& value, boost::contract::virtual_* v) {
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boost::contract::old_ptr<std::size_t> old_capacity =
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BOOST_CONTRACT_OLDOF(v, capacity());
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boost::contract::guard c = boost::contract::public_function(v, this)
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.precondition([&] {
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BOOST_CONTRACT_ASSERT(capacity() < max_size());
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})
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.postcondition([&] {
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BOOST_CONTRACT_ASSERT(capacity() >= *old_capacity);
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})
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;
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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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BOOST_TEST_EQ(vect.size(), 1);
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return boost::report_errors();
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}
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