libs/contract/example/features/separate_body.hpp
#ifndef SEPARATE_BODY_HPP_
#define SEPARATE_BODY_HPP_
// 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>
//[separate_body_hpp
class iarray :
private boost::contract::constructor_precondition<iarray> {
public:
void invariant() const {
BOOST_CONTRACT_ASSERT(size() <= capacity());
}
explicit iarray(unsigned max, unsigned count = 0) :
boost::contract::constructor_precondition<iarray>([&] {
BOOST_CONTRACT_ASSERT(count <= max);
}),
// Still, member initializations must be here.
values_(new int[max]),
capacity_(max)
{
boost::contract::check c = boost::contract::constructor(this)
.postcondition([&] {
BOOST_CONTRACT_ASSERT(capacity() == max);
BOOST_CONTRACT_ASSERT(size() == count);
})
;
constructor_body(max, count); // Separate constructor body impl.
}
virtual ~iarray() {
boost::contract::check c = boost::contract::destructor(this); // Inv.
destructor_body(); // Separate destructor body implementation.
}
virtual void push_back(int value, boost::contract::virtual_* v = 0) {
boost::contract::old_ptr<unsigned> old_size =
BOOST_CONTRACT_OLDOF(v, size());
boost::contract::check c = boost::contract::public_function(v, this)
.precondition([&] {
BOOST_CONTRACT_ASSERT(size() < capacity());
})
.postcondition([&] {
BOOST_CONTRACT_ASSERT(size() == *old_size + 1);
})
;
push_back_body(value); // Separate member function body implementation.
}
private:
// Contracts in class declaration (above), but body implementations are not.
void constructor_body(unsigned max, unsigned count);
void destructor_body();
void push_back_body(int value);
/* ... */
//]
public:
unsigned capacity() const {
// Check invariants.
boost::contract::check c = boost::contract::public_function(this);
return capacity_body();
}
unsigned size() const {
// Check invariants.
boost::contract::check c = boost::contract::public_function(this);
return size_body();
}
private:
unsigned size_body() const;
unsigned capacity_body() const;
int* values_;
unsigned capacity_;
unsigned size_;
};
#endif // #include guard