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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2014-2014. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/move for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_MOVE_DEFAULT_DELETE_HPP_INCLUDED
#define BOOST_MOVE_DEFAULT_DELETE_HPP_INCLUDED
#include <boost/move/detail/config_begin.hpp>
#include <boost/move/detail/workaround.hpp>
#include <boost/move/detail/unique_ptr_meta_utils.hpp>
#include <boost/move/utility_core.hpp>
#include <boost/static_assert.hpp>
#include <cstddef> //For std::size_t,std::nullptr_t
//!\file
//! Describes the default deleter (destruction policy) of <tt>unique_ptr</tt>: <tt>default_delete</tt>.
namespace boost{
namespace move_upd {
namespace bmupmu = ::boost::move_upmu;
////////////////////////////////////////
//// enable_def_del
////////////////////////////////////////
//compatible with a pointer type T*:
//When either Y* is convertible to T*
//Y is U[N] and T is U cv []
template<class U, class T>
struct def_del_compatible_cond
: bmupmu::is_convertible<U*, T*>
{};
template<class U, class T, std::size_t N>
struct def_del_compatible_cond<U[N], T[]>
: def_del_compatible_cond<U[], T[]>
{};
template<class U, class T, class Type = bmupmu::nat>
struct enable_def_del
: bmupmu::enable_if_c<def_del_compatible_cond<U, T>::value, Type>
{};
////////////////////////////////////////
//// enable_defdel_call
////////////////////////////////////////
//When 2nd is T[N], 1st(*)[N] shall be convertible to T(*)[N];
//When 2nd is T[], 1st(*)[] shall be convertible to T(*)[];
//Otherwise, 1st* shall be convertible to 2nd*.
template<class U, class T, class Type = bmupmu::nat>
struct enable_defdel_call
: public enable_def_del<U, T, Type>
{};
template<class U, class T, class Type>
struct enable_defdel_call<U, T[], Type>
: public enable_def_del<U[], T[], Type>
{};
template<class U, class T, class Type, std::size_t N>
struct enable_defdel_call<U, T[N], Type>
: public enable_def_del<U[N], T[N], Type>
{};
////////////////////////////////////////
//// Some bool literal zero conversion utilities
////////////////////////////////////////
struct bool_conversion {int for_bool; int for_arg(); };
typedef int bool_conversion::* explicit_bool_arg;
#if !defined(BOOST_NO_CXX11_NULLPTR) && !defined(BOOST_NO_CXX11_DECLTYPE)
typedef decltype(nullptr) nullptr_type;
#elif !defined(BOOST_NO_CXX11_NULLPTR)
typedef std::nullptr_t nullptr_type;
#else
typedef int (bool_conversion::*nullptr_type)();
#endif
} //namespace move_upd {
namespace movelib {
namespace bmupd = boost::move_upd;
namespace bmupmu = ::boost::move_upmu;
//!The class template <tt>default_delete</tt> serves as the default deleter
//!(destruction policy) for the class template <tt>unique_ptr</tt>.
//!
//! \tparam T The type to be deleted. It may be an incomplete type
template <class T>
struct default_delete
{
//! Default constructor.
//!
BOOST_CONSTEXPR default_delete()
//Avoid "defaulted on its first declaration must not have an exception-specification" error for GCC 4.6
#if !defined(BOOST_GCC) || (BOOST_GCC < 40600 && BOOST_GCC >= 40700) || defined(BOOST_MOVE_DOXYGEN_INVOKED)
BOOST_NOEXCEPT
#endif
#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) || defined(BOOST_MOVE_DOXYGEN_INVOKED)
= default;
#else
{};
#endif
#if defined(BOOST_MOVE_DOXYGEN_INVOKED)
default_delete(const default_delete&) BOOST_NOEXCEPT = default;
default_delete &operator=(const default_delete&) BOOST_NOEXCEPT = default;
#else
typedef typename bmupmu::remove_extent<T>::type element_type;
#endif
//! <b>Effects</b>: Constructs a default_delete object from another <tt>default_delete<U></tt> object.
//!
//! <b>Remarks</b>: This constructor shall not participate in overload resolution unless:
//! - If T is not an array type and U* is implicitly convertible to T*.
//! - If T is an array type and U* is a more CV qualified pointer to remove_extent<T>::type.
template <class U>
default_delete(const default_delete<U>&
BOOST_MOVE_DOCIGN(BOOST_MOVE_I typename bmupd::enable_def_del<U BOOST_MOVE_I T>::type* =0)
) BOOST_NOEXCEPT
{
//If T is not an array type, U derives from T
//and T has no virtual destructor, then you have a problem
BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor<default_delete, U>::value ));
}
//! <b>Effects</b>: Constructs a default_delete object from another <tt>default_delete<U></tt> object.
//!
//! <b>Remarks</b>: This constructor shall not participate in overload resolution unless:
//! - If T is not an array type and U* is implicitly convertible to T*.
//! - If T is an array type and U* is a more CV qualified pointer to remove_extent<T>::type.
template <class U>
BOOST_MOVE_DOC1ST(default_delete&,
typename bmupd::enable_def_del<U BOOST_MOVE_I T BOOST_MOVE_I default_delete &>::type)
operator=(const default_delete<U>&) BOOST_NOEXCEPT
{
//If T is not an array type, U derives from T
//and T has no virtual destructor, then you have a problem
BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor<default_delete, U>::value ));
return *this;
}
//! <b>Effects</b>: if T is not an array type, calls <tt>delete</tt> on static_cast<T*>(ptr),
//! otherwise calls <tt>delete[]</tt> on static_cast<remove_extent<T>::type*>(ptr).
//!
//! <b>Remarks</b>: If U is an incomplete type, the program is ill-formed.
//! This operator shall not participate in overload resolution unless:
//! - T is not an array type and U* is convertible to T*, OR
//! - T is an array type, and remove_cv<U>::type is the same type as
//! remove_cv<remove_extent<T>::type>::type and U* is convertible to remove_extent<T>::type*.
template <class U>
BOOST_MOVE_DOC1ST(void, typename bmupd::enable_defdel_call<U BOOST_MOVE_I T BOOST_MOVE_I void>::type)
operator()(U* ptr) const BOOST_NOEXCEPT
{
//U must be a complete type
BOOST_STATIC_ASSERT(sizeof(U) > 0);
//If T is not an array type, U derives from T
//and T has no virtual destructor, then you have a problem
BOOST_STATIC_ASSERT(( !::boost::move_upmu::missing_virtual_destructor<default_delete, U>::value ));
element_type * const p = static_cast<element_type*>(ptr);
bmupmu::is_array<T>::value ? delete [] p : delete p;
}
//! <b>Effects</b>: Same as <tt>(*this)(static_cast<element_type*>(nullptr))</tt>.
//!
void operator()(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type)) const BOOST_NOEXCEPT
{ BOOST_STATIC_ASSERT(sizeof(element_type) > 0); }
};
} //namespace movelib {
} //namespace boost{
#include <boost/move/detail/config_end.hpp>
#endif //#ifndef BOOST_MOVE_DEFAULT_DELETE_HPP_INCLUDED
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