std:: at_quick_exit

Registers the function pointed to by func to be called on quick program termination (via std::quick_exit ).

Calling the function from several threads does not induce a data race. The implementation is guaranteed to support the registration of at least 32 functions. The exact limit is implementation-defined.

The registered functions will not be called on normal program termination . If a function need to be called in that case, std::atexit must be used.

Parameters

Return value

​ 0 ​ if the registration succeeds, nonzero value otherwise.

Notes

The two overloads are distinct because the types of the parameter func are distinct ( language linkage is part of its type).

Example

#include <cstdlib>
#include <iostream>
 
void f1()
{
    std::cout << "pushed first" << std::endl; // flush is intentional
}
 
extern "C" void f2()
{
    std::cout << "pushed second\n";
}
 
int main()
{
    auto f3 = []
    {
        std::cout << "pushed third\n";
    };
 
    std::at_quick_exit(f1);
    std::at_quick_exit(f2);
    std::at_quick_exit(f3);
    std::quick_exit(0);
}

pushed third
pushed second
pushed first

See also