std::quick_exit

 

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Program support utilities

Program termination
abort exit quick_exit (C++11) _Exit (C++11)	atexit at_quick_exit (C++11) EXIT_SUCCESSEXIT_FAILURE
Unreachable control flow
unreachable (C++23)
Communicating with the environment
system	getenv
Signals
signal raise sig_atomic_t	SIG_DFLSIG_IGN SIG_ERR
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SIGABRTSIGFPESIGILL	SIGINTSIGSEGVSIGTERM
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setjmp	longjmp
Types
jmp_buf

 

Defined in header <cstdlib>
[[noreturn]] void quick_exit( int exit_code ) noexcept;		(since C++11)

Causes normal program termination to occur without completely cleaning the resources.

Functions passed to std::at_quick_exit are called in reverse order of their registration. If an exception tries to propagate out of any of the functions, std::terminate is called. After calling the registered functions, calls std::_Exit(exit_code)

Functions passed to std::atexit are not called.

Parameters

exit_code

-

exit status of the program

Return value

(none)

Example

Run this code

#include <cstdlib>
#include <iostream>
 
template <int N>
void quick_exit_handler()
{
    std::cout << "quick_exit handler #" << N << std::endl; // flush is intended
}
 
void at_exit_handler()
{
    std::cout << "at_exit handler\n";
}
 
int main()
{
    if ( std::at_quick_exit( quick_exit_handler<1> ) or
         std::at_quick_exit( quick_exit_handler<2> ) )
    {
        std::cerr << "Registration failed\n";
        return EXIT_FAILURE;
    }
 
    std::atexit( at_exit_handler ); // the handler will not be called
 
    struct R { ~R() { std::cout << "destructor\n"; } } resource;
 
    /*...*/
 
    std::quick_exit( EXIT_SUCCESS );
 
    std::cout << "This statement is unreachable...\n";
}

Output:

quick_exit handler #2
quick_exit handler #1

See also

abort	causes abnormal program termination (without cleaning up) (function)
exit	causes normal program termination with cleaning up (function)
atexit	registers a function to be called on std::exit() invocation (function)
at_quick_exit (C++11)	registers a function to be called on std::quick_exit invocation (function)