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