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std::set_new_handler

STD：设置[医]新[医]处理程序

Defined in header ​​
std::new_handler set_new_handler( std::new_handler new_p ​​

制造new_p新的全局新处理程序函数并返回先前安装的新处理程序。

大新处理程序函数是由分配函数每当内存分配尝试失败时。它的目的是三件事之一：

1%29使更多内存可用

2%29终止程序%28例如。打电话std::terminate%29

3%29抛出类型异常std::bad_alloc或衍生自std::bad_alloc...

默认实现抛出std::bad_alloc.用户可以安装自己的新处理程序，这可能提供与默认行为不同的行为。

如果新处理程序返回时，分配函数重复先前失败的分配尝试，并调用新处理程序如果分配再次失败的话。结束循环，新处理程序可能打电话std::set_new_handler(nullptr)*如果在尝试分配失败后，分配函数发现std::get_new_handler返回一个空指针值，它将引发std::bad_alloc...

在程序启动时，新处理程序为空指针。

This function is thread-safe. Every call to std::set_new_handler synchronizes-with (see std::memory_order) the subsequent std::set_new_handler and std::get_new_handler calls.(since C++11)

参数

new_p-pointer to function of type std::new_handler, or null pointer

返回值

以前安装的新处理程序，如果没有安装，则为空指针值。

例外

(none)(until C++11)
noexcept specification: noexcept(since C++11)

例

二次

#include <iostream>
#include <new>
 
void handler()
{
    std::cout << "Memory allocation failed, terminating\n";
    std::set_new_handler(nullptr
}
 
int main()
{
    std::set_new_handler(handler
    try {
        while (true) {
            new int[100000000ul];
        }
    } catch (const std::bad_alloc& e) {
        std::cout << e.what() << '\n';
    }
}

二次

产出：

二次

Memory allocation failed, terminating
std::bad_alloc

二次

另见

operator newoperator new[]allocation functions (function)
get_new_handler (C++11)obtains the current new handler (function)
new_handlerfunction pointer type of the new handler (typedef)
bad_allocexception thrown when memory allocation fails (class)

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http：//en.cppreference.com/w/cpp/Memory/new/set[医]新[医]处理程序

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