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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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