7759a387e2
Backport from mainline 2017-09-12 Jonathan Wakely <jwakely@redhat.com> PR libstdc++/79433 * doc/xml/manual/status_cxx2017.xml: Update feature-test macros. * doc/html/*: Regenerate. * include/Makefile.am: Remove <bits/c++17_warning.h>. * include/Makefile.in: Regenerate. * include/bits/c++17_warning.h: Remove. * include/bits/string_view.tcc: Do not include <bits/c++17_warning.h> for pre-C++17 modes. * include/std/any: Likewise. (__cpp_lib_any): Define. * include/std/mutex (__cpp_lib_scoped_lock): Adjust value as per new SD-6 draft. * include/std/numeric (__cpp_lib_gcd_lcm): Define as per new SD-6 draft. * include/std/optional: Do not include <bits/c++17_warning.h>. (__cpp_lib_optional): Define. * include/std/shared_mutex: Do not include <bits/c++14_warning.h>. * include/std/string_view: Do not include <bits/c++17_warning.h>. (__cpp_lib_string_view): Define. * include/std/variant: Do not include <bits/c++17_warning.h>. (__cpp_lib_variant): Define. * testsuite/20_util/optional/cons/value_neg.cc: Adjust dg-error line numbers. * testsuite/26_numerics/gcd/1.cc: Test for __cpp_lib_gcd_lcm. * testsuite/26_numerics/gcd/gcd_neg.cc: Adjust dg-error line numbers. * testsuite/26_numerics/lcm/1.cc: Test for __cpp_lib_gcd_lcm. * testsuite/26_numerics/lcm/lcm_neg.cc: Adjust dg-error line numbers. * testsuite/30_threads/scoped_lock/requirements/typedefs.cc: Adjust expected value of __cpp_lib_scoped_lock. From-SVN: r253943
634 lines
18 KiB
C++
634 lines
18 KiB
C++
// <any> -*- C++ -*-
|
|
|
|
// Copyright (C) 2014-2017 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 include/any
|
|
* This is a Standard C++ Library header.
|
|
*/
|
|
|
|
#ifndef _GLIBCXX_ANY
|
|
#define _GLIBCXX_ANY 1
|
|
|
|
#pragma GCC system_header
|
|
|
|
#if __cplusplus >= 201703L
|
|
|
|
#include <typeinfo>
|
|
#include <new>
|
|
#include <utility>
|
|
#include <type_traits>
|
|
|
|
namespace std _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
/**
|
|
* @addtogroup utilities
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @brief Exception class thrown by a failed @c any_cast
|
|
* @ingroup exceptions
|
|
*/
|
|
class bad_any_cast : public bad_cast
|
|
{
|
|
public:
|
|
virtual const char* what() const noexcept { return "bad any_cast"; }
|
|
};
|
|
|
|
[[gnu::noreturn]] inline void __throw_bad_any_cast()
|
|
{
|
|
#if __cpp_exceptions
|
|
throw bad_any_cast{};
|
|
#else
|
|
__builtin_abort();
|
|
#endif
|
|
}
|
|
|
|
#define __cpp_lib_any 201603
|
|
|
|
/**
|
|
* @brief A type-safe container of any type.
|
|
*
|
|
* An @c any object's state is either empty or it stores a contained object
|
|
* of CopyConstructible type.
|
|
*/
|
|
class any
|
|
{
|
|
// Holds either pointer to a heap object or the contained object itself.
|
|
union _Storage
|
|
{
|
|
constexpr _Storage() : _M_ptr{nullptr} {}
|
|
|
|
// Prevent trivial copies of this type, buffer might hold a non-POD.
|
|
_Storage(const _Storage&) = delete;
|
|
_Storage& operator=(const _Storage&) = delete;
|
|
|
|
void* _M_ptr;
|
|
aligned_storage<sizeof(_M_ptr), alignof(void*)>::type _M_buffer;
|
|
};
|
|
|
|
template<typename _Tp, typename _Safe = is_nothrow_move_constructible<_Tp>,
|
|
bool _Fits = (sizeof(_Tp) <= sizeof(_Storage))
|
|
&& (alignof(_Tp) <= alignof(_Storage))>
|
|
using _Internal = std::integral_constant<bool, _Safe::value && _Fits>;
|
|
|
|
template<typename _Tp>
|
|
struct _Manager_internal; // uses small-object optimization
|
|
|
|
template<typename _Tp>
|
|
struct _Manager_external; // creates contained object on the heap
|
|
|
|
template<typename _Tp>
|
|
using _Manager = conditional_t<_Internal<_Tp>::value,
|
|
_Manager_internal<_Tp>,
|
|
_Manager_external<_Tp>>;
|
|
|
|
template<typename _Tp, typename _Decayed = decay_t<_Tp>>
|
|
using _Decay = enable_if_t<!is_same<_Decayed, any>::value, _Decayed>;
|
|
|
|
/// Emplace with an object created from @p __args as the contained object.
|
|
template <typename _Tp, typename... _Args,
|
|
typename _Mgr = _Manager<_Tp>>
|
|
void __do_emplace(_Args&&... __args)
|
|
{
|
|
reset();
|
|
_M_manager = &_Mgr::_S_manage;
|
|
_Mgr::_S_create(_M_storage, std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
/// Emplace with an object created from @p __il and @p __args as
|
|
/// the contained object.
|
|
template <typename _Tp, typename _Up, typename... _Args,
|
|
typename _Mgr = _Manager<_Tp>>
|
|
void __do_emplace(initializer_list<_Up> __il, _Args&&... __args)
|
|
{
|
|
reset();
|
|
_M_manager = &_Mgr::_S_manage;
|
|
_Mgr::_S_create(_M_storage, __il, std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
public:
|
|
// construct/destruct
|
|
|
|
/// Default constructor, creates an empty object.
|
|
constexpr any() noexcept : _M_manager(nullptr) { }
|
|
|
|
/// Copy constructor, copies the state of @p __other
|
|
any(const any& __other)
|
|
{
|
|
if (!__other.has_value())
|
|
_M_manager = nullptr;
|
|
else
|
|
{
|
|
_Arg __arg;
|
|
__arg._M_any = this;
|
|
__other._M_manager(_Op_clone, &__other, &__arg);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Move constructor, transfer the state from @p __other
|
|
*
|
|
* @post @c !__other.has_value() (this postcondition is a GNU extension)
|
|
*/
|
|
any(any&& __other) noexcept
|
|
{
|
|
if (!__other.has_value())
|
|
_M_manager = nullptr;
|
|
else
|
|
{
|
|
_Arg __arg;
|
|
__arg._M_any = this;
|
|
__other._M_manager(_Op_xfer, &__other, &__arg);
|
|
}
|
|
}
|
|
|
|
template <typename _Res, typename _Tp, typename... _Args>
|
|
using __any_constructible =
|
|
enable_if<__and_<is_copy_constructible<_Tp>,
|
|
is_constructible<_Tp, _Args...>>::value,
|
|
_Res>;
|
|
|
|
template <typename _Tp, typename... _Args>
|
|
using __any_constructible_t =
|
|
typename __any_constructible<bool, _Tp, _Args...>::type;
|
|
|
|
/// Construct with a copy of @p __value as the contained object.
|
|
template <typename _ValueType, typename _Tp = _Decay<_ValueType>,
|
|
typename _Mgr = _Manager<_Tp>,
|
|
__any_constructible_t<_Tp, _ValueType&&> = true,
|
|
enable_if_t<!__is_in_place_type<_Tp>::value, bool> = true>
|
|
any(_ValueType&& __value)
|
|
: _M_manager(&_Mgr::_S_manage)
|
|
{
|
|
_Mgr::_S_create(_M_storage, std::forward<_ValueType>(__value));
|
|
}
|
|
|
|
/// Construct with a copy of @p __value as the contained object.
|
|
template <typename _ValueType, typename _Tp = _Decay<_ValueType>,
|
|
typename _Mgr = _Manager<_Tp>,
|
|
enable_if_t<__and_<is_copy_constructible<_Tp>,
|
|
__not_<is_constructible<_Tp, _ValueType&&>>,
|
|
__not_<__is_in_place_type<_Tp>>>::value,
|
|
bool> = false>
|
|
any(_ValueType&& __value)
|
|
: _M_manager(&_Mgr::_S_manage)
|
|
{
|
|
_Mgr::_S_create(_M_storage, __value);
|
|
}
|
|
|
|
/// Construct with an object created from @p __args as the contained object.
|
|
template <typename _ValueType, typename... _Args,
|
|
typename _Tp = _Decay<_ValueType>,
|
|
typename _Mgr = _Manager<_Tp>,
|
|
__any_constructible_t<_Tp, _Args&&...> = false>
|
|
explicit
|
|
any(in_place_type_t<_ValueType>, _Args&&... __args)
|
|
: _M_manager(&_Mgr::_S_manage)
|
|
{
|
|
_Mgr::_S_create(_M_storage, std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
/// Construct with an object created from @p __il and @p __args as
|
|
/// the contained object.
|
|
template <typename _ValueType, typename _Up, typename... _Args,
|
|
typename _Tp = _Decay<_ValueType>,
|
|
typename _Mgr = _Manager<_Tp>,
|
|
__any_constructible_t<_Tp, initializer_list<_Up>,
|
|
_Args&&...> = false>
|
|
explicit
|
|
any(in_place_type_t<_ValueType>,
|
|
initializer_list<_Up> __il, _Args&&... __args)
|
|
: _M_manager(&_Mgr::_S_manage)
|
|
{
|
|
_Mgr::_S_create(_M_storage, __il, std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
/// Destructor, calls @c reset()
|
|
~any() { reset(); }
|
|
|
|
// assignments
|
|
|
|
/// Copy the state of another object.
|
|
any& operator=(const any& __rhs)
|
|
{
|
|
*this = any(__rhs);
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief Move assignment operator
|
|
*
|
|
* @post @c !__rhs.has_value() (not guaranteed for other implementations)
|
|
*/
|
|
any& operator=(any&& __rhs) noexcept
|
|
{
|
|
if (!__rhs.has_value())
|
|
reset();
|
|
else if (this != &__rhs)
|
|
{
|
|
reset();
|
|
_Arg __arg;
|
|
__arg._M_any = this;
|
|
__rhs._M_manager(_Op_xfer, &__rhs, &__arg);
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
/// Store a copy of @p __rhs as the contained object.
|
|
template<typename _ValueType>
|
|
enable_if_t<is_copy_constructible<_Decay<_ValueType>>::value, any&>
|
|
operator=(_ValueType&& __rhs)
|
|
{
|
|
*this = any(std::forward<_ValueType>(__rhs));
|
|
return *this;
|
|
}
|
|
|
|
/// Emplace with an object created from @p __args as the contained object.
|
|
template <typename _ValueType, typename... _Args>
|
|
typename __any_constructible<_Decay<_ValueType>&,
|
|
_Decay<_ValueType>, _Args&&...>::type
|
|
emplace(_Args&&... __args)
|
|
{
|
|
__do_emplace<_Decay<_ValueType>>
|
|
(std::forward<_Args>(__args)...);
|
|
any::_Arg __arg;
|
|
this->_M_manager(any::_Op_access, this, &__arg);
|
|
return *static_cast<_Decay<_ValueType>*>(__arg._M_obj);
|
|
}
|
|
|
|
/// Emplace with an object created from @p __il and @p __args as
|
|
/// the contained object.
|
|
template <typename _ValueType, typename _Up, typename... _Args>
|
|
typename __any_constructible<_Decay<_ValueType>&,
|
|
_Decay<_ValueType>,
|
|
initializer_list<_Up>,
|
|
_Args&&...>::type
|
|
emplace(initializer_list<_Up> __il, _Args&&... __args)
|
|
{
|
|
__do_emplace<_Decay<_ValueType>, _Up>
|
|
(__il, std::forward<_Args>(__args)...);
|
|
any::_Arg __arg;
|
|
this->_M_manager(any::_Op_access, this, &__arg);
|
|
return *static_cast<_Decay<_ValueType>*>(__arg._M_obj);
|
|
}
|
|
|
|
// modifiers
|
|
|
|
/// If not empty, destroy the contained object.
|
|
void reset() noexcept
|
|
{
|
|
if (has_value())
|
|
{
|
|
_M_manager(_Op_destroy, this, nullptr);
|
|
_M_manager = nullptr;
|
|
}
|
|
}
|
|
|
|
/// Exchange state with another object.
|
|
void swap(any& __rhs) noexcept
|
|
{
|
|
if (!has_value() && !__rhs.has_value())
|
|
return;
|
|
|
|
if (has_value() && __rhs.has_value())
|
|
{
|
|
if (this == &__rhs)
|
|
return;
|
|
|
|
any __tmp;
|
|
_Arg __arg;
|
|
__arg._M_any = &__tmp;
|
|
__rhs._M_manager(_Op_xfer, &__rhs, &__arg);
|
|
__arg._M_any = &__rhs;
|
|
_M_manager(_Op_xfer, this, &__arg);
|
|
__arg._M_any = this;
|
|
__tmp._M_manager(_Op_xfer, &__tmp, &__arg);
|
|
}
|
|
else
|
|
{
|
|
any* __empty = !has_value() ? this : &__rhs;
|
|
any* __full = !has_value() ? &__rhs : this;
|
|
_Arg __arg;
|
|
__arg._M_any = __empty;
|
|
__full->_M_manager(_Op_xfer, __full, &__arg);
|
|
}
|
|
}
|
|
|
|
// observers
|
|
|
|
/// Reports whether there is a contained object or not.
|
|
bool has_value() const noexcept { return _M_manager != nullptr; }
|
|
|
|
#if __cpp_rtti
|
|
/// The @c typeid of the contained object, or @c typeid(void) if empty.
|
|
const type_info& type() const noexcept
|
|
{
|
|
if (!has_value())
|
|
return typeid(void);
|
|
_Arg __arg;
|
|
_M_manager(_Op_get_type_info, this, &__arg);
|
|
return *__arg._M_typeinfo;
|
|
}
|
|
#endif
|
|
|
|
template<typename _Tp>
|
|
static constexpr bool __is_valid_cast()
|
|
{ return __or_<is_reference<_Tp>, is_copy_constructible<_Tp>>::value; }
|
|
|
|
private:
|
|
enum _Op {
|
|
_Op_access, _Op_get_type_info, _Op_clone, _Op_destroy, _Op_xfer
|
|
};
|
|
|
|
union _Arg
|
|
{
|
|
void* _M_obj;
|
|
const std::type_info* _M_typeinfo;
|
|
any* _M_any;
|
|
};
|
|
|
|
void (*_M_manager)(_Op, const any*, _Arg*);
|
|
_Storage _M_storage;
|
|
|
|
template<typename _Tp>
|
|
friend void* __any_caster(const any* __any);
|
|
|
|
// Manage in-place contained object.
|
|
template<typename _Tp>
|
|
struct _Manager_internal
|
|
{
|
|
static void
|
|
_S_manage(_Op __which, const any* __anyp, _Arg* __arg);
|
|
|
|
template<typename _Up>
|
|
static void
|
|
_S_create(_Storage& __storage, _Up&& __value)
|
|
{
|
|
void* __addr = &__storage._M_buffer;
|
|
::new (__addr) _Tp(std::forward<_Up>(__value));
|
|
}
|
|
|
|
template<typename... _Args>
|
|
static void
|
|
_S_create(_Storage& __storage, _Args&&... __args)
|
|
{
|
|
void* __addr = &__storage._M_buffer;
|
|
::new (__addr) _Tp(std::forward<_Args>(__args)...);
|
|
}
|
|
};
|
|
|
|
// Manage external contained object.
|
|
template<typename _Tp>
|
|
struct _Manager_external
|
|
{
|
|
static void
|
|
_S_manage(_Op __which, const any* __anyp, _Arg* __arg);
|
|
|
|
template<typename _Up>
|
|
static void
|
|
_S_create(_Storage& __storage, _Up&& __value)
|
|
{
|
|
__storage._M_ptr = new _Tp(std::forward<_Up>(__value));
|
|
}
|
|
template<typename... _Args>
|
|
static void
|
|
_S_create(_Storage& __storage, _Args&&... __args)
|
|
{
|
|
__storage._M_ptr = new _Tp(std::forward<_Args>(__args)...);
|
|
}
|
|
};
|
|
};
|
|
|
|
/// Exchange the states of two @c any objects.
|
|
inline void swap(any& __x, any& __y) noexcept { __x.swap(__y); }
|
|
|
|
/// Create an any holding a @c _Tp constructed from @c __args.
|
|
template <typename _Tp, typename... _Args>
|
|
any make_any(_Args&&... __args)
|
|
{
|
|
return any(in_place_type<_Tp>, std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
/// Create an any holding a @c _Tp constructed from @c __il and @c __args.
|
|
template <typename _Tp, typename _Up, typename... _Args>
|
|
any make_any(initializer_list<_Up> __il, _Args&&... __args)
|
|
{
|
|
return any(in_place_type<_Tp>, __il, std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
template <typename _Tp>
|
|
using _AnyCast = remove_cv_t<remove_reference_t<_Tp>>;
|
|
/**
|
|
* @brief Access the contained object.
|
|
*
|
|
* @tparam _ValueType A const-reference or CopyConstructible type.
|
|
* @param __any The object to access.
|
|
* @return The contained object.
|
|
* @throw bad_any_cast If <code>
|
|
* __any.type() != typeid(remove_reference_t<_ValueType>)
|
|
* </code>
|
|
*/
|
|
template<typename _ValueType>
|
|
inline _ValueType any_cast(const any& __any)
|
|
{
|
|
static_assert(any::__is_valid_cast<_ValueType>(),
|
|
"Template argument must be a reference or CopyConstructible type");
|
|
auto __p = any_cast<_AnyCast<_ValueType>>(&__any);
|
|
if (__p)
|
|
return static_cast<_ValueType>(*__p);
|
|
__throw_bad_any_cast();
|
|
}
|
|
|
|
/**
|
|
* @brief Access the contained object.
|
|
*
|
|
* @tparam _ValueType A reference or CopyConstructible type.
|
|
* @param __any The object to access.
|
|
* @return The contained object.
|
|
* @throw bad_any_cast If <code>
|
|
* __any.type() != typeid(remove_reference_t<_ValueType>)
|
|
* </code>
|
|
*
|
|
* @{
|
|
*/
|
|
template<typename _ValueType>
|
|
inline _ValueType any_cast(any& __any)
|
|
{
|
|
static_assert(any::__is_valid_cast<_ValueType>(),
|
|
"Template argument must be a reference or CopyConstructible type");
|
|
auto __p = any_cast<_AnyCast<_ValueType>>(&__any);
|
|
if (__p)
|
|
return static_cast<_ValueType>(*__p);
|
|
__throw_bad_any_cast();
|
|
}
|
|
|
|
template<typename _ValueType,
|
|
typename enable_if<!is_move_constructible<_ValueType>::value
|
|
|| is_lvalue_reference<_ValueType>::value,
|
|
bool>::type = true>
|
|
inline _ValueType any_cast(any&& __any)
|
|
{
|
|
static_assert(any::__is_valid_cast<_ValueType>(),
|
|
"Template argument must be a reference or CopyConstructible type");
|
|
auto __p = any_cast<_AnyCast<_ValueType>>(&__any);
|
|
if (__p)
|
|
return static_cast<_ValueType>(*__p);
|
|
__throw_bad_any_cast();
|
|
}
|
|
|
|
template<typename _ValueType,
|
|
typename enable_if<is_move_constructible<_ValueType>::value
|
|
&& !is_lvalue_reference<_ValueType>::value,
|
|
bool>::type = false>
|
|
inline _ValueType any_cast(any&& __any)
|
|
{
|
|
static_assert(any::__is_valid_cast<_ValueType>(),
|
|
"Template argument must be a reference or CopyConstructible type");
|
|
auto __p = any_cast<_AnyCast<_ValueType>>(&__any);
|
|
if (__p)
|
|
return static_cast<_ValueType>(std::move(*__p));
|
|
__throw_bad_any_cast();
|
|
}
|
|
// @}
|
|
|
|
template<typename _Tp>
|
|
void* __any_caster(const any* __any)
|
|
{
|
|
if constexpr (is_copy_constructible_v<decay_t<_Tp>>)
|
|
{
|
|
if (__any->_M_manager == &any::_Manager<decay_t<_Tp>>::_S_manage)
|
|
{
|
|
any::_Arg __arg;
|
|
__any->_M_manager(any::_Op_access, __any, &__arg);
|
|
return __arg._M_obj;
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
/**
|
|
* @brief Access the contained object.
|
|
*
|
|
* @tparam _ValueType The type of the contained object.
|
|
* @param __any A pointer to the object to access.
|
|
* @return The address of the contained object if <code>
|
|
* __any != nullptr && __any.type() == typeid(_ValueType)
|
|
* </code>, otherwise a null pointer.
|
|
*
|
|
* @{
|
|
*/
|
|
template<typename _ValueType>
|
|
inline const _ValueType* any_cast(const any* __any) noexcept
|
|
{
|
|
if (__any)
|
|
return static_cast<_ValueType*>(__any_caster<_ValueType>(__any));
|
|
return nullptr;
|
|
}
|
|
|
|
template<typename _ValueType>
|
|
inline _ValueType* any_cast(any* __any) noexcept
|
|
{
|
|
if (__any)
|
|
return static_cast<_ValueType*>(__any_caster<_ValueType>(__any));
|
|
return nullptr;
|
|
}
|
|
// @}
|
|
|
|
template<typename _Tp>
|
|
void
|
|
any::_Manager_internal<_Tp>::
|
|
_S_manage(_Op __which, const any* __any, _Arg* __arg)
|
|
{
|
|
// The contained object is in _M_storage._M_buffer
|
|
auto __ptr = reinterpret_cast<const _Tp*>(&__any->_M_storage._M_buffer);
|
|
switch (__which)
|
|
{
|
|
case _Op_access:
|
|
__arg->_M_obj = const_cast<_Tp*>(__ptr);
|
|
break;
|
|
case _Op_get_type_info:
|
|
#if __cpp_rtti
|
|
__arg->_M_typeinfo = &typeid(_Tp);
|
|
#endif
|
|
break;
|
|
case _Op_clone:
|
|
::new(&__arg->_M_any->_M_storage._M_buffer) _Tp(*__ptr);
|
|
__arg->_M_any->_M_manager = __any->_M_manager;
|
|
break;
|
|
case _Op_destroy:
|
|
__ptr->~_Tp();
|
|
break;
|
|
case _Op_xfer:
|
|
::new(&__arg->_M_any->_M_storage._M_buffer) _Tp
|
|
(std::move(*const_cast<_Tp*>(__ptr)));
|
|
__ptr->~_Tp();
|
|
__arg->_M_any->_M_manager = __any->_M_manager;
|
|
const_cast<any*>(__any)->_M_manager = nullptr;
|
|
break;
|
|
}
|
|
}
|
|
|
|
template<typename _Tp>
|
|
void
|
|
any::_Manager_external<_Tp>::
|
|
_S_manage(_Op __which, const any* __any, _Arg* __arg)
|
|
{
|
|
// The contained object is *_M_storage._M_ptr
|
|
auto __ptr = static_cast<const _Tp*>(__any->_M_storage._M_ptr);
|
|
switch (__which)
|
|
{
|
|
case _Op_access:
|
|
__arg->_M_obj = const_cast<_Tp*>(__ptr);
|
|
break;
|
|
case _Op_get_type_info:
|
|
#if __cpp_rtti
|
|
__arg->_M_typeinfo = &typeid(_Tp);
|
|
#endif
|
|
break;
|
|
case _Op_clone:
|
|
__arg->_M_any->_M_storage._M_ptr = new _Tp(*__ptr);
|
|
__arg->_M_any->_M_manager = __any->_M_manager;
|
|
break;
|
|
case _Op_destroy:
|
|
delete __ptr;
|
|
break;
|
|
case _Op_xfer:
|
|
__arg->_M_any->_M_storage._M_ptr = __any->_M_storage._M_ptr;
|
|
__arg->_M_any->_M_manager = __any->_M_manager;
|
|
const_cast<any*>(__any)->_M_manager = nullptr;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/// @}
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace std
|
|
|
|
#endif // C++14
|
|
|
|
#endif // _GLIBCXX_ANY
|