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std::bad_weak_ptr

Материал из cppreference.com

 
 
 
Динамическое управление памятью
Низкий уровень управления памятью
Распределители
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Allocators
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allocator
allocator_traits(C++11)
allocator_arg_t(C++11)
allocator_arg(C++11)
uses_allocator(C++11)
scoped_allocator_adaptor(C++11)
Неинициализированные хранения
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Uninitialized storage
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uninitialized_copy
uninitialized_copy_n(C++11)
uninitialized_fill
uninitialized_fill_n
raw_storage_iterator
get_temporary_buffer
return_temporary_buffer
Умные указатели
Original:
Smart pointers
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unique_ptr(C++11)
shared_ptr(C++11)
weak_ptr(C++11)
auto_ptr(устарело)
owner_less(C++11)
enable_shared_from_this(C++11)
bad_weak_ptr(C++11)
default_delete(C++11)
Поддержка сборки мусора
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Garbage collection support
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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)
Разное
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Miscellaneous
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pointer_traits(C++11)
addressof(C++11)
align(C++11)
C Library
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C Library
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std::bad_weak_ptr
Член функций
Original:
Member functions
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bad_weak_ptr::bad_weak_ptr
 
Заголовочный файл <memory>
class bad_weak_ptr;
(начиная с C++11)
std::bad_weak_ptr является тип объекта брошен в качестве исключения в конструкторах std::shared_ptr, которые принимают std::weak_ptr в качестве аргумента, когда std::weak_ptr относится к уже удаленному объекту.
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.
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cpp/error/exceptionstd-bad weak ptr-inheritance.svg
Описание изображения

Диаграмма наследования

Содержание

[править] Член функций

строит bad_weak_ptr объекта
Original:
constructs the bad_weak_ptr object
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(public функция-член)

Унаследован от std::exception

Member functions

[virtual]
разрушает объект исключения
Original:
destructs the exception object
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(virtual public std::exception функция-член) [edit]
[virtual]
возвращает пояснительной строкой
Original:
returns an explanatory string
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(virtual public std::exception функция-член) [edit]

[править] Пример

#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';
    }
}

Вывод:

std::bad_weak_ptr

[править] См. также

smart pointer with shared object ownership semantics
(шаблон класса) [edit]
(C++11)
слабую ссылку на объект, управляемый std::shared_ptr
Original:
weak reference to an object managed by std::shared_ptr
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(шаблон класса) [edit]