120 lines
4.0 KiB
C++
120 lines
4.0 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 <boost/local_function.hpp>
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#include <boost/bind.hpp>
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#include <cassert>
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class iarray :
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private boost::contract::constructor_precondition<iarray> {
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public:
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static void static_invariant() {
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BOOST_CONTRACT_ASSERT(instances() >= 0);
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}
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void invariant() const {
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BOOST_CONTRACT_ASSERT(size() <= capacity());
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}
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static void constructor_pre(unsigned const max, unsigned const count) {
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BOOST_CONTRACT_ASSERT(count <= max);
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}
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explicit iarray(unsigned max, unsigned count = 0) :
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boost::contract::constructor_precondition<iarray>(boost::bind(
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&iarray::constructor_pre, max, count)),
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values_(new int[max]),
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capacity_(max)
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{
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boost::contract::old_ptr<int> old_instances;
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void BOOST_LOCAL_FUNCTION(bind& old_instances) {
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old_instances = BOOST_CONTRACT_OLDOF(iarray::instances());
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} BOOST_LOCAL_FUNCTION_NAME(old)
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void BOOST_LOCAL_FUNCTION(const bind this_, const bind& count,
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const bind& old_instances) {
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BOOST_CONTRACT_ASSERT(this_->size() == count);
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BOOST_CONTRACT_ASSERT(this_->instances() == *old_instances + 1);
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} BOOST_LOCAL_FUNCTION_NAME(post)
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boost::contract::check c = boost::contract::constructor(this)
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.old(old).postcondition(post);
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for(unsigned i = 0; i < count; ++i) values_[i] = int();
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size_ = count;
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++instances_;
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}
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virtual ~iarray() {
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boost::contract::old_ptr<int> old_instances;
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void BOOST_LOCAL_FUNCTION(const bind this_, bind& old_instances) {
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old_instances = BOOST_CONTRACT_OLDOF(this_->instances());
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} BOOST_LOCAL_FUNCTION_NAME(old)
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void BOOST_LOCAL_FUNCTION(const bind& old_instances) {
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BOOST_CONTRACT_ASSERT(iarray::instances() == *old_instances - 1);
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} BOOST_LOCAL_FUNCTION_NAME(post)
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boost::contract::check c = boost::contract::destructor(this)
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.old(old).postcondition(post);
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delete[] values_;
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--instances_;
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}
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virtual void push_back(int value, boost::contract::virtual_* v = 0) {
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boost::contract::old_ptr<unsigned> old_size;
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void BOOST_LOCAL_FUNCTION(const bind this_) {
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BOOST_CONTRACT_ASSERT(this_->size() < this_->capacity());
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} BOOST_LOCAL_FUNCTION_NAME(pre)
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void BOOST_LOCAL_FUNCTION(const bind v, const bind this_,
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bind& old_size) {
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old_size = BOOST_CONTRACT_OLDOF(v, this_->size());
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} BOOST_LOCAL_FUNCTION_NAME(old)
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void BOOST_LOCAL_FUNCTION(const bind this_, const bind& old_size) {
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BOOST_CONTRACT_ASSERT(this_->size() == *old_size + 1);
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} BOOST_LOCAL_FUNCTION_NAME(post)
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boost::contract::check c = boost::contract::public_function(v, this)
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.precondition(pre).old(old).postcondition(post);
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values_[size_++] = value;
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}
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unsigned capacity() const {
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// Check invariants.
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boost::contract::check c = boost::contract::public_function(this);
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return capacity_;
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}
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unsigned size() const {
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// Check invariants.
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boost::contract::check c = boost::contract::public_function(this);
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return size_;
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}
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static int instances() {
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// Check static invariants.
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boost::contract::check c = boost::contract::public_function<iarray>();
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return instances_;
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}
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private:
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int* values_;
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unsigned capacity_;
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unsigned size_;
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static int instances_;
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};
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int iarray::instances_ = 0;
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int main() {
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iarray a(3, 2);
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assert(a.capacity() == 3);
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assert(a.size() == 2);
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a.push_back('x');
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assert(a.size() == 3);
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return 0;
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}
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