std::set_new_handler

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Defined in header <new>
std::new_handler set_new_handler(std::new_handler new_p)
使new_p新的全球新的处理函数，并返回以前安装的新的处理程序.
Original:
Makes new_p the new global new-handler function and returns the previously installed new-handler.
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目录

[编辑] 注释

“新的处理程序”功能是调用的函数的内存分配尝试失败时，<div class="t-tr-text">分配的功能
Original:
allocation functions
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。其目的是三件事情之一
Original:
The new-handler function is the function called by
分配的功能
Original:
allocation functions
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</div> whenever a memory allocation attempt fails. Its intended purpose is one of three things:
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1)
使更多的内存可用
Original:
make more memory available
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2)
终止程序（例如，通过调用std::terminate）
Original:
terminate the program (e.g. by calling std::terminate)
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3)
抛出异常的类型std::bad_alloc或来自std::bad_alloc
Original:
throw exception of type std::bad_alloc or derived from std::bad_alloc
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如果“新的处理程序”回报，分配函数重复先前分配失败的尝试，并调用新的“处理程序”，如果分配失败，再次。结束循环，新的处理程序“，可致电std::set_new_handler(nullptr)：如果分配失败尝试后，发现，std::get_new_handler返回一个空指针值分配功能，它会抛出std::bad_alloc.
Original:
If new-handler returns, the allocation function repeats the previously-failed allocation attempt and calls the new-handler again if the allocation fails again. To end the loop, new-handler may call std::set_new_handler(nullptr): if, after a failed allocation attempt, allocation function finds that std::get_new_handler returns a null pointer value, it will throw std::bad_alloc.
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在程序启动时，“新的处理程序”是一个空指针.
Original:
At program startup, new-handler is a null pointer.
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[编辑] 参数

new_p -
的的类型std::new_handler，或空指针指向函数
Original:
pointer to function of type std::new_handler, or null pointer
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[编辑] 返回值

以前安装的新的处理程序，或一个空指针，如果没有安装.
Original:
The previously-installed new handler, or a null pointer value if none was installed.
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[编辑] 例外

noexcept specification:  
noexcept
  （C++11 起）

[编辑] 为例

#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';
    }
}

Output: 

Memory allocation failed, terminating
std::bad_alloc

[编辑] 另请参阅
分配的功能
Original:
allocation functions
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（函数） [edit]
set_new_handler
注册一个新的处理程序
Original:
registers a new handler
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（函数） [edit]
新的处理程序的函数指针类型
Original:
function pointer type of the new handler
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（的typedef） [edit]
内存分配失败时抛出的异常
Original:
exception thrown when memory allocation fails
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（类） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/memory/new/set_new_handler&oldid=27253”