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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
//[cline90_stack
#include <boost/contract.hpp>
#include <cassert>
// NOTE: Incomplete contract assertions, addressing only `empty` and `full`.
template<typename T>
class stack
#define BASES private boost::contract::constructor_precondition<stack<T> >
: BASES
{
friend class boost::contract::access;
typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types;
#undef BASES
public:
explicit stack(int capacity) :
boost::contract::constructor_precondition<stack>([&] {
BOOST_CONTRACT_ASSERT(capacity >= 0);
}),
data_(new T[capacity]), capacity_(capacity), size_(0)
{
boost::contract::check c = boost::contract::constructor(this)
.postcondition([&] {
BOOST_CONTRACT_ASSERT(empty());
BOOST_CONTRACT_ASSERT(full() == (capacity == 0));
})
;
for(int i = 0; i < capacity_; ++i) data_[i] = T();
}
virtual ~stack() {
boost::contract::check c = boost::contract::destructor(this);
delete[] data_;
}
bool empty() const {
boost::contract::check c = boost::contract::public_function(this);
return size_ == 0;
}
bool full() const {
boost::contract::check c = boost::contract::public_function(this);
return size_ == capacity_;
}
void push(T const& value) {
boost::contract::check c = boost::contract::public_function(this)
.precondition([&] {
BOOST_CONTRACT_ASSERT(!full());
})
.postcondition([&] {
BOOST_CONTRACT_ASSERT(!empty());
})
;
data_[size_++] = value;
}
T pop() {
boost::contract::check c = boost::contract::public_function(this)
.precondition([&] {
BOOST_CONTRACT_ASSERT(!empty());
})
.postcondition([&] {
BOOST_CONTRACT_ASSERT(!full());
})
;
return data_[--size_];
}
private:
T* data_;
int capacity_;
int size_;
};
int main() {
stack<int> s(3);
s.push(123);
assert(s.pop() == 123);
return 0;
}
//]
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