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// unique_ptr implementation -*- C++ -*-
// Copyright (C) 2008, 2009 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file unique_ptr.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
#ifndef _UNIQUE_PTR_H
#define _UNIQUE_PTR_H 1
#ifndef __GXX_EXPERIMENTAL_CXX0X__
# include <c++0x_warning.h>
#endif
#include <bits/c++config.h>
#include <debug/debug.h>
#include <type_traits>
#include <utility>
#include <tuple>
_GLIBCXX_BEGIN_NAMESPACE(std)
/**
* @addtogroup pointer_abstractions
* @{
*/
/// Primary template, default_delete.
template<typename _Tp>
struct default_delete
{
default_delete() { }
template<typename _Up>
default_delete(const default_delete<_Up>&) { }
void
operator()(_Tp* __ptr) const
{
static_assert(sizeof(_Tp)>0,
"can't delete pointer to incomplete type");
delete __ptr;
}
};
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 740 - omit specialization for array objects with a compile time length
/// Specialization, default_delete.
template<typename _Tp>
struct default_delete<_Tp[]>
{
void
operator()(_Tp* __ptr) const
{
static_assert(sizeof(_Tp)>0,
"can't delete pointer to incomplete type");
delete [] __ptr;
}
};
/// 20.7.12.2 unique_ptr for single objects.
template <typename _Tp, typename _Tp_Deleter = default_delete<_Tp> >
class unique_ptr
{
typedef std::tuple<_Tp*, _Tp_Deleter> __tuple_type;
typedef __tuple_type unique_ptr::* __unspecified_bool_type;
typedef _Tp* unique_ptr::* __unspecified_pointer_type;
public:
typedef _Tp* pointer;
typedef _Tp element_type;
typedef _Tp_Deleter deleter_type;
// Constructors.
unique_ptr()
: _M_t(pointer(), deleter_type())
{ static_assert(!std::is_pointer<deleter_type>::value,
"constructed with null function pointer deleter"); }
explicit
unique_ptr(pointer __p)
: _M_t(__p, deleter_type())
{ static_assert(!std::is_pointer<deleter_type>::value,
"constructed with null function pointer deleter"); }
unique_ptr(pointer __p,
typename std::conditional<std::is_reference<deleter_type>::value,
deleter_type, const deleter_type&>::type __d)
: _M_t(__p, __d) { }
unique_ptr(pointer __p,
typename std::remove_reference<deleter_type>::type&& __d)
: _M_t(std::move(__p), std::move(__d))
{ static_assert(!std::is_reference<deleter_type>::value,
"rvalue deleter bound to reference"); }
// Move constructors.
unique_ptr(unique_ptr&& __u)
: _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
template<typename _Up, typename _Up_Deleter>
unique_ptr(unique_ptr<_Up, _Up_Deleter>&& __u)
: _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter()))
{ }
// Destructor.
~unique_ptr() { reset(); }
// Assignment.
unique_ptr&
operator=(unique_ptr&& __u)
{
reset(__u.release());
get_deleter() = std::move(__u.get_deleter());
return *this;
}
template<typename _Up, typename _Up_Deleter>
unique_ptr&
operator=(unique_ptr<_Up, _Up_Deleter>&& __u)
{
reset(__u.release());
get_deleter() = std::move(__u.get_deleter());
return *this;
}
unique_ptr&
operator=(__unspecified_pointer_type)
{
reset();
return *this;
}
// Observers.
typename std::add_lvalue_reference<element_type>::type operator*() const
{
_GLIBCXX_DEBUG_ASSERT(get() != 0);
return *get();
}
pointer
operator->() const
{
_GLIBCXX_DEBUG_ASSERT(get() != 0);
return get();
}
pointer
get() const
{ return std::get<0>(_M_t); }
typename std::add_lvalue_reference<deleter_type>::type
get_deleter()
{ return std::get<1>(_M_t); }
typename std::add_lvalue_reference<
typename std::add_const<deleter_type>::type
>::type
get_deleter() const
{ return std::get<1>(_M_t); }
operator __unspecified_bool_type () const
{ return get() == 0 ? 0 : &unique_ptr::_M_t; }
// Modifiers.
pointer
release()
{
pointer __p = get();
std::get<0>(_M_t) = 0;
return __p;
}
void
reset(pointer __p = pointer())
{
if (__p != get())
{
get_deleter()(get());
std::get<0>(_M_t) = __p;
}
}
void
swap(unique_ptr&& __u)
{
using std::swap;
swap(_M_t, __u._M_t);
}
// Disable copy from lvalue.
unique_ptr(const unique_ptr&) = delete;
template<typename _Up, typename _Up_Deleter>
unique_ptr(const unique_ptr<_Up, _Up_Deleter>&) = delete;
unique_ptr& operator=(const unique_ptr&) = delete;
template<typename _Up, typename _Up_Deleter>
unique_ptr& operator=(const unique_ptr<_Up, _Up_Deleter>&) = delete;
private:
__tuple_type _M_t;
};
/// 20.7.12.3 unique_ptr for array objects with a runtime length
// [unique.ptr.runtime]
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 740 - omit specialization for array objects with a compile time length
template<typename _Tp, typename _Tp_Deleter>
class unique_ptr<_Tp[], _Tp_Deleter>
{
typedef std::tuple<_Tp*, _Tp_Deleter> __tuple_type;
typedef __tuple_type unique_ptr::* __unspecified_bool_type;
typedef _Tp* unique_ptr::* __unspecified_pointer_type;
public:
typedef _Tp* pointer;
typedef _Tp element_type;
typedef _Tp_Deleter deleter_type;
// Constructors.
unique_ptr()
: _M_t(pointer(), deleter_type())
{ static_assert(!std::is_pointer<deleter_type>::value,
"constructed with null function pointer deleter"); }
explicit
unique_ptr(pointer __p)
: _M_t(__p, deleter_type())
{ static_assert(!std::is_pointer<deleter_type>::value,
"constructed with null function pointer deleter"); }
unique_ptr(pointer __p,
typename std::conditional<std::is_reference<deleter_type>::value,
deleter_type, const deleter_type&>::type __d)
: _M_t(__p, __d) { }
unique_ptr(pointer __p,
typename std::remove_reference<deleter_type>::type && __d)
: _M_t(std::move(__p), std::move(__d))
{ static_assert(!std::is_reference<deleter_type>::value,
"rvalue deleter bound to reference"); }
// Move constructors.
unique_ptr(unique_ptr&& __u)
: _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
template<typename _Up, typename _Up_Deleter>
unique_ptr(unique_ptr<_Up, _Up_Deleter>&& __u)
: _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter()))
{ }
// Destructor.
~unique_ptr() { reset(); }
// Assignment.
unique_ptr&
operator=(unique_ptr&& __u)
{
reset(__u.release());
get_deleter() = std::move(__u.get_deleter());
return *this;
}
template<typename _Up, typename _Up_Deleter>
unique_ptr&
operator=(unique_ptr<_Up, _Up_Deleter>&& __u)
{
reset(__u.release());
get_deleter() = std::move(__u.get_deleter());
return *this;
}
unique_ptr&
operator=(__unspecified_pointer_type)
{
reset();
return *this;
}
// Observers.
typename std::add_lvalue_reference<element_type>::type
operator[](size_t __i) const
{
_GLIBCXX_DEBUG_ASSERT(get() != 0);
return get()[__i];
}
pointer
get() const
{ return std::get<0>(_M_t); }
typename std::add_lvalue_reference<deleter_type>::type
get_deleter()
{ return std::get<1>(_M_t); }
typename std::add_lvalue_reference<
typename std::add_const<deleter_type>::type
>::type
get_deleter() const
{ return std::get<1>(_M_t); }
operator __unspecified_bool_type () const
{ return get() == 0 ? 0 : &unique_ptr::_M_t; }
// Modifiers.
pointer
release()
{
pointer __p = get();
std::get<0>(_M_t) = 0;
return __p;
}
void
reset(pointer __p = pointer())
{
if (__p != get())
{
get_deleter()(get());
std::get<0>(_M_t) = __p;
}
}
// DR 821.
template<typename _Up>
void reset(_Up) = delete;
void
swap(unique_ptr&& __u)
{
using std::swap;
swap(_M_t, __u._M_t);
}
// Disable copy from lvalue.
unique_ptr(const unique_ptr&) = delete;
unique_ptr& operator=(const unique_ptr&) = delete;
// Disable construction from convertible pointer types.
// (N2315 - 20.6.5.3.1)
template<typename _Up>
unique_ptr(_Up*, typename
std::conditional<std::is_reference<deleter_type>::value,
deleter_type, const deleter_type&>::type,
typename std::enable_if<std::is_convertible<_Up*,
pointer>::value>::type* = 0) = delete;
template<typename _Up>
unique_ptr(_Up*, typename std::remove_reference<deleter_type>::type&&,
typename std::enable_if<std::is_convertible<_Up*,
pointer>::value>::type* = 0) = delete;
template<typename _Up>
explicit
unique_ptr(_Up*, typename std::enable_if<std::is_convertible<_Up*,
pointer>::value>::type* = 0) = delete;
private:
__tuple_type _M_t;
};
template<typename _Tp, typename _Tp_Deleter>
inline void
swap(unique_ptr<_Tp, _Tp_Deleter>& __x,
unique_ptr<_Tp, _Tp_Deleter>& __y)
{ __x.swap(__y); }
template<typename _Tp, typename _Tp_Deleter>
inline void
swap(unique_ptr<_Tp, _Tp_Deleter>&& __x,
unique_ptr<_Tp, _Tp_Deleter>& __y)
{ __x.swap(__y); }
template<typename _Tp, typename _Tp_Deleter>
inline void
swap(unique_ptr<_Tp, _Tp_Deleter>& __x,
unique_ptr<_Tp, _Tp_Deleter>&& __y)
{ __x.swap(__y); }
template<typename _Tp, typename _Tp_Deleter,
typename _Up, typename _Up_Deleter>
inline bool
operator==(const unique_ptr<_Tp, _Tp_Deleter>& __x,
const unique_ptr<_Up, _Up_Deleter>& __y)
{ return __x.get() == __y.get(); }
template<typename _Tp, typename _Tp_Deleter,
typename _Up, typename _Up_Deleter>
inline bool
operator!=(const unique_ptr<_Tp, _Tp_Deleter>& __x,
const unique_ptr<_Up, _Up_Deleter>& __y)
{ return !(__x.get() == __y.get()); }
template<typename _Tp, typename _Tp_Deleter,
typename _Up, typename _Up_Deleter>
inline bool
operator<(const unique_ptr<_Tp, _Tp_Deleter>& __x,
const unique_ptr<_Up, _Up_Deleter>& __y)
{ return __x.get() < __y.get(); }
template<typename _Tp, typename _Tp_Deleter,
typename _Up, typename _Up_Deleter>
inline bool
operator<=(const unique_ptr<_Tp, _Tp_Deleter>& __x,
const unique_ptr<_Up, _Up_Deleter>& __y)
{ return !(__y.get() < __x.get()); }
template<typename _Tp, typename _Tp_Deleter,
typename _Up, typename _Up_Deleter>
inline bool
operator>(const unique_ptr<_Tp, _Tp_Deleter>& __x,
const unique_ptr<_Up, _Up_Deleter>& __y)
{ return __y.get() < __x.get(); }
template<typename _Tp, typename _Tp_Deleter,
typename _Up, typename _Up_Deleter>
inline bool
operator>=(const unique_ptr<_Tp, _Tp_Deleter>& __x,
const unique_ptr<_Up, _Up_Deleter>& __y)
{ return !(__x.get() < __y.get()); }
// @} group pointer_abstractions
_GLIBCXX_END_NAMESPACE
#endif /* _UNIQUE_PTR_H */
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