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
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unreachable (C++23)
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system	getenv
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signal raise sig_atomic_t	SIG_DFLSIG_IGN SIG_ERR
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SIGABRTSIGFPESIGILL	SIGINTSIGSEGVSIGTERM
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setjmp	longjmp
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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>)||std::at_quick_exit(quick_exit_handler<2>)){std::cerr<<"Registration failed\n";returnEXIT_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)
C documentation for quick_exit