63e88f80
 Hu Chunming
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#ifndef BOOST_CONTRACT_CONSTRUCTOR_HPP_
#define BOOST_CONTRACT_CONSTRUCTOR_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
/** @file
Program contracts for constructors.
*/
#include <boost/contract/core/config.hpp>
#include <boost/contract/core/specify.hpp>
#include <boost/contract/core/access.hpp>
#include <boost/contract/core/constructor_precondition.hpp>
#if !defined(BOOST_CONTRACT_NO_CONSTRUCTORS) || \
!defined(BOOST_CONTRACT_NO_PRECONDITIONS) || \
defined(BOOST_CONTRACT_STATIC_LINK)
#include <boost/contract/detail/operation/constructor.hpp>
#endif
namespace boost { namespace contract {
/**
Program contracts for constructors.
This is used to specify postconditions, exception guarantees, old value copies
at body, and check class invariants for constructors (see
@RefClass{boost::contract::constructor_precondition} to specify preconditions
for constructors):
@code
class u {
friend class boost::contract:access;
void invariant() const { // Optional (as for static and volatile).
BOOST_CONTRACT_ASSERT(...);
...
}
public:
u(...) {
boost::contract::old_ptr<old_type> old_var;
boost::contract::check c = boost::contract::constructor(this)
// No `.precondition` (use `constructor_precondition` instead).
.old([&] { // Optional.
old_var = BOOST_CONTRACT_OLDOF(old_expr);
...
})
.postcondition([&] { // Optional.
BOOST_CONTRACT_ASSERT(...);
...
})
.except([&] { // Optional.
BOOST_CONTRACT_ASSERT(...);
...
})
;
... // Constructor body.
}
...
};
@endcode
For optimization, this can be omitted for constructors that do not have
postconditions and exception guarantees, within classes that have no invariants.
@see @RefSect{tutorial.constructors, Constructors}
@param obj The object @c this from the scope of the enclosing constructor
declaring the contract.
(Constructors check all class invariants, including static and
volatile invariants, see @RefSect{tutorial.class_invariants,
Class Invariants} and
@RefSect{extras.volatile_public_functions,
Volatile Public Functions}).
@tparam Class The type of the class containing the constructor declaring the
contract.
(Usually this template parameter is automatically deduced by C++
and it does not need to be explicitly specified by programmers.)
@return The result of this function must be assigned to a variable of type
@RefClass{boost::contract::check} declared explicitly (i.e., without
using C++11 @c auto declarations) and locally just before the code of
the constructor body (otherwise this library will generate a run-time
error, see @RefMacro{BOOST_CONTRACT_ON_MISSING_CHECK_DECL}).
*/
template<class Class>
specify_old_postcondition_except<> constructor(Class* obj) {
// Must #if also on ..._PRECONDITIONS here because specify_... is generic.
#if !defined(BOOST_CONTRACT_NO_CONSTRUCTORS) || \
!defined(BOOST_CONTRACT_NO_PRECONDITIONS) || \
defined(BOOST_CONTRACT_STATIC_LINK)
return specify_old_postcondition_except<>(
new boost::contract::detail::constructor<Class>(obj));
#else
return specify_old_postcondition_except<>();
#endif
}
} } // namespace
#endif // #include guard
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