std::bad_weak_ptr

来自cppreference.com

This page has been machine-translated from the English version of the wiki using Google Translate.

The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here.

Click here for the English version of this page

 
C++
 
实用工具库
类型的支持 (basic types, RTTI, type traits)
动态内存管理
错误处理
程序实用工具
可变参数函数
日期和时间
函数对象
initializer_list（C++11）
bitset
hash（C++11）
关系运算符
Original:
Relational operators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
双和元组
Original:
Pairs and tuples
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
pair
tuple（C++11）
piecewise_construct_t（C++11）
piecewise_construct（C++11）
掉期，远期和移动
Original:
Swap, forward and move
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
swap
forward（C++11）
move（C++11）
move_if_noexcept（C++11）
declval（C++11）
 
动态内存管理
低级别的内存管理
分配器
Original:
Allocators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
allocator
allocator_traits（C++11）
allocator_arg_t（C++11）
allocator_arg（C++11）
uses_allocator（C++11）
scoped_allocator_adaptor（C++11）
未初始化的存储空间
Original:
Uninitialized storage
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
uninitialized_copy
uninitialized_copy_n（C++11）
uninitialized_fill
uninitialized_fill_n
raw_storage_iterator
get_temporary_buffer
return_temporary_buffer
智能指针
Original:
Smart pointers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
unique_ptr（C++11）
shared_ptr（C++11）
weak_ptr（C++11）
auto_ptr（过时了）
owner_less（C++11）
enable_shared_from_this（C++11）
bad_weak_ptr（C++11）
default_delete（C++11）
垃圾收集的支持
Original:
Garbage collection support
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
declare_reachable（C++11）
undeclare_reachable（C++11）
declare_no_pointers（C++11）
undeclare_no_pointers（C++11）
pointer_safety（C++11）
get_pointer_safety（C++11）
杂项
Original:
Miscellaneous
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
pointer_traits（C++11）
addressof（C++11）
align（C++11）
C库
Original:
C Library
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
 
std::bad_weak_ptr
成员函数
Original:
Member functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
bad_weak_ptr::bad_weak_ptr
 
Defined in header <memory>
class bad_weak_ptr;
 （C++11 起）
std::bad_weak_ptr是std::shared_ptr，std::weak_ptr的说法，当std::weak_ptr指的是一个已被删除的对象的构造函数抛出的异常对象的类型.
Original:
std::bad_weak_ptr is the type of the object thrown as exceptions by the constructors of std::shared_ptr that take std::weak_ptr as the argument, when the std::weak_ptr refers to an already deleted object.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
cpp/error/exceptionstd-bad weak ptr-inheritance.svg
关于这幅图像

Inheritance diagram

目录

[编辑] 成员函数
构建bad_weak_ptr对象
Original:
constructs the bad_weak_ptr object
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

（公共成员函数）

Inherited from std::exception

Member functions

[虚拟的] </ SPAN></div></div>
解构异常对象
Original:
destructs the exception object
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

（虚拟公有成员函数of std::exception） [edit]
[虚拟的] </ SPAN></div></div>
返回一个说明字符串
Original:
returns an explanatory string
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

（虚拟公有成员函数of std::exception） [edit]

</div>

[编辑] 为例

#include <memory>
#include <iostream>
int main()
{
    std::shared_ptr<int> p1(new int(42));
    std::weak_ptr<int> wp(p1);
    p1.reset();
    try {
        std::shared_ptr<int> p2(wp);
    } catch(const std::bad_weak_ptr& e) {
        std::cout << e.what() << '\n';
    }
}

Output: 

std::bad_weak_ptr

[编辑] 另请参阅

（C++11）
 smart pointer with shared object ownership semantics
（类模板） [edit]
（C++11）
std::shared_ptr管理对象的弱引用
Original:
weak reference to an object managed by std::shared_ptr
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

（类模板） [edit]

来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/memory/bad_weak_ptr&oldid=27516”