digitalmars.D.learn - How do I properly exit from a D program (outside main)?
- AsmMan (4/4) Sep 15 2014 Someone said somewhere that call std.c.process.exit() isn't the
- notna (4/8) Sep 15 2014 how about "return"? :)
- AsmMan (10/18) Sep 15 2014 Neither assert or return will help. Check out this code example:
- Jacob Carlborg (5/14) Sep 15 2014 If you want to exit the application with exit code 1 then it sounds like...
- H. S. Teoh via Digitalmars-d-learn (36/39) Sep 15 2014 AFAIK, there is currently no replacement. I personally use an
- AsmMan (3/49) Sep 15 2014 Thanks! I'll use it.
Someone said somewhere that call std.c.process.exit() isn't the proper way to exit from a D program since it doesn't terminate some phobos stuff. So what should I use instead of? or there's no a replacement?
Sep 15 2014
how about "return"? :) there is also "assert"... and pls note, scope could also be your friend :O On Monday, 15 September 2014 at 23:36:56 UTC, AsmMan wrote:Someone said somewhere that call std.c.process.exit() isn't the proper way to exit from a D program since it doesn't terminate some phobos stuff. So what should I use instead of? or there's no a replacement?
Sep 15 2014
On Monday, 15 September 2014 at 23:42:02 UTC, notna wrote:how about "return"? :) there is also "assert"... and pls note, scope could also be your friend :O On Monday, 15 September 2014 at 23:36:56 UTC, AsmMan wrote:Neither assert or return will help. Check out this code example: void main() { f(); } void f() { if(!foo) exit(1); do_something(); }Someone said somewhere that call std.c.process.exit() isn't the proper way to exit from a D program since it doesn't terminate some phobos stuff. So what should I use instead of? or there's no a replacement?
Sep 15 2014
On 16/09/14 02:06, AsmMan wrote:Neither assert or return will help. Check out this code example: void main() { f(); } void f() { if(!foo) exit(1); do_something(); }If you want to exit the application with exit code 1 then it sounds like something has gone wrong. In that case, throw an exception instead. -- /Jacob Carlborg
Sep 15 2014
On Mon, Sep 15, 2014 at 11:36:54PM +0000, AsmMan via Digitalmars-d-learn wrote:Someone said somewhere that call std.c.process.exit() isn't the proper way to exit from a D program since it doesn't terminate some phobos stuff. So what should I use instead of? or there's no a replacement?AFAIK, there is currently no replacement. I personally use an ExitException and put a catch block in main(): class ExitException : Exception { int status; this(int _status=0, string file=__FILE__, size_t line=__LINE__) { super("Program exit", file, line); status = _status; } } void exit(int status=0) { throw new ExitException(status); } ... int main() { try { ... } catch(ExitException e) { return e.status; } return 0; } The catch is that this may or may not work correctly in multithreaded programs, because the exception may happen in a different thread than the one main() is running in, and there isn't any nice way to terminate other still-running threads after catching such an exception. There has some discussion as to how to implement this, but AFAIK no good solution was found. See also: https://issues.dlang.org/show_bug.cgi?id=3462 But at least, for single-threaded programs, the above ExitException should work reasonably well. T -- Almost all proofs have bugs, but almost all theorems are true. -- Paul Pedersen
Sep 15 2014
On Monday, 15 September 2014 at 23:52:25 UTC, H. S. Teoh via Digitalmars-d-learn wrote:On Mon, Sep 15, 2014 at 11:36:54PM +0000, AsmMan via Digitalmars-d-learn wrote:Thanks! I'll use it.Someone said somewhere that call std.c.process.exit() isn't the proper way to exit from a D program since it doesn't terminate some phobos stuff. So what should I use instead of? or there's no a replacement?AFAIK, there is currently no replacement. I personally use an ExitException and put a catch block in main(): class ExitException : Exception { int status; this(int _status=0, string file=__FILE__, size_t line=__LINE__) { super("Program exit", file, line); status = _status; } } void exit(int status=0) { throw new ExitException(status); } ... int main() { try { ... } catch(ExitException e) { return e.status; } return 0; } The catch is that this may or may not work correctly in multithreaded programs, because the exception may happen in a different thread than the one main() is running in, and there isn't any nice way to terminate other still-running threads after catching such an exception. There has some discussion as to how to implement this, but AFAIK no good solution was found. See also: https://issues.dlang.org/show_bug.cgi?id=3462 But at least, for single-threaded programs, the above ExitException should work reasonably well. T
Sep 15 2014