std::atexit
科技促进发展：出口
| Defined in header | | |
|---|---|---|
| int atexit( /*c-atexit-handler*/* func int atexit( /*atexit-handler*/* func | (1) | |
| extern "C++" using /*atexit-handler*/ = void( // exposition-only extern "C" using /*c-atexit-handler*/ = void( // exposition-only | (2) | |
注册所指向的函数。func在正常程序终止%28via时被调用std::exit()或从主要功能29%。
| The functions will be called during the destruction of the static objects, in reverse order: if A was registered before B, then the call to B is made before the call to A. Same applies to the ordering between static object constructors and the calls to atexit: see std::exit | (until C++11) |
|---|---|
| The functions may be called concurrently with the destruction of the objects with static storage duration and with each other, maintaining the guarantee that if registration of A was sequenced-before the registration of B, then the call to B is sequenced-before the call to A, same applies to the sequencing between static object constructors and calls to atexit: see std::exit | (since C++11) |
同一功能可以多次注册。
如果函数通过异常退出，std::terminate叫做。
atexit线程安全：从多个线程调用函数不会引发数据竞争。
保证执行至少支持注册32职能。确切的限制是实现定义的。
参数
| func | - | pointer to a function to be called on normal program termination |
|---|
返回值
0如果注册成功，则为非零值。
注记
这两个重载是不同的，因为参数的类型。func分别为%28语言链接是其类型%29的一部分。
例外
| (none) | (until C++11) |
|---|---|
| noexcept specification: noexcept | (since C++11) |
例
二次
#include <iostream>
#include <cstdlib>
void atexit_handler_1()
{
std::cout << "at exit #1\n";
}
void atexit_handler_2()
{
std::cout << "at exit #2\n";
}
int main()
{
const int result_1 = std::atexit(atexit_handler_1
const int result_2 = std::atexit(atexit_handler_2
if ((result_1 != 0) or (result_2 != 0)) {
std::cerr << "Registration failed\n";
return EXIT_FAILURE;
}
std::cout << "returning from main\n";
return EXIT_SUCCESS;
}
二次
产出：
二次
returning from main
at exit #2
at exit #1
二次
另见
| at_quick_exit (C++11) | registers a function to be called on quick_exit invocation (function) |
|---|
c出口文件
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