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Showing content from https://en.cppreference.com/w/cpp/language/../language/../utility/program/at_quick_exit.html below:

std::at_quick_exit - cppreference.com

int at_quick_exit( /*atexit-handler*/* func ) noexcept;
int at_quick_exit( /*c-atexit-handler*/* func ) noexcept;

extern "C++" using /*atexit-handler*/ = void();
extern "C" using /*c-atexit-handler*/ = void();

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.

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

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

#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);
}

Output:

pushed third
pushed second
pushed first

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