C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Evaluating expressions with side effects.          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Jason Heyes Guest Posted: Tue Dec 21, 2004 7:16 am    Post subject: Evaluating expressions with side effects. Are the side effects of evaluating expr1 resolved before expr2 is evaluated? if (expr1 && expr2) Thanks. Back to top Alf P. Steinbach Guest Posted: Tue Dec 21, 2004 7:36 am    Post subject: Re: Evaluating expressions with side effects. * Jason Heyes: Quote: Are the side effects of evaluating expr1 resolved before expr2 is evaluated? if (expr1 && expr2) Thanks. Do get yourself a copy of the standard. The answer is yes, except destruction of temporaries. Now find which paragraph in the standard says exactly that! ;-) -- A: Because it messes up the order in which people normally read text. Q: Why is it such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? Back to top Jason Heyes Guest Posted: Tue Dec 21, 2004 7:44 am    Post subject: Re: Evaluating expressions with side effects. "Alf P. Steinbach" <alfps (AT) start (DOT) no> wrote Quote: * Jason Heyes: Are the side effects of evaluating expr1 resolved before expr2 is evaluated? if (expr1 && expr2) Thanks. Do get yourself a copy of the standard. The answer is yes, except destruction of temporaries. Now find which paragraph in the standard says exactly that! ;-) I rarely need to refer to the standard directly (never, in fact). So why should I start now? Back to top Alf P. Steinbach Guest Posted: Tue Dec 21, 2004 7:57 am    Post subject: Re: Evaluating expressions with side effects. * Jason Heyes: Quote: "Alf P. Steinbach" <alfps (AT) start (DOT) no> wrote in message news:41c7d23a.498078062 (AT) news (DOT) individual.net... * Jason Heyes: Are the side effects of evaluating expr1 resolved before expr2 is evaluated? if (expr1 && expr2) Thanks. Do get yourself a copy of the standard. The answer is yes, except destruction of temporaries. Now find which paragraph in the standard says exactly that! ;-) I rarely need to refer to the standard directly (never, in fact). So why should I start now? You needed it now, so the 'never' is incorrect. Presumably the 'rarely' is also incorrect. You should start now so that you do your work yourself instead of asking others to do it for you. -- A: Because it messes up the order in which people normally read text. Q: Why is it such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? Back to top Jason Heyes Guest Posted: Tue Dec 21, 2004 8:17 am    Post subject: Re: Evaluating expressions with side effects. "Alf P. Steinbach" <alfps (AT) start (DOT) no> wrote Quote: * Jason Heyes: "Alf P. Steinbach" <alfps (AT) start (DOT) no> wrote in message news:41c7d23a.498078062 (AT) news (DOT) individual.net... * Jason Heyes: Are the side effects of evaluating expr1 resolved before expr2 is evaluated? if (expr1 && expr2) Thanks. Do get yourself a copy of the standard. The answer is yes, except destruction of temporaries. Now find which paragraph in the standard says exactly that! ;-) I rarely need to refer to the standard directly (never, in fact). So why should I start now? You needed it now, so the 'never' is incorrect. Presumably the 'rarely' is also incorrect. You should start now so that you do your work yourself instead of asking others to do it for you. Does this mean I can't ask questions here anymore? Back to top Sharad Kala Guest Posted: Tue Dec 21, 2004 8:38 am    Post subject: Re: Evaluating expressions with side effects. "Jason Heyes" <jasonheyes (AT) optusnet (DOT) com.au> wrote in message Quote: "Alf P. Steinbach" <alfps (AT) start (DOT) no> wrote in message asking others to do it for you. Does this mean I can't ask questions here anymore? Not at all. I think the point Alf is making is that to write correct and authoritative programs one needs to have a copy of Standard. As you may be aware that not always compilers get correct results. What do you do then ? The answer is the Holy Standard. But I do agree that if you don't require to use C++ daily, or in depth then probably Standard is not what you may want to read. But for a serious C++ programmer it is a must. Best wishes, Sharad Back to top Siemel Naran Guest Posted: Tue Dec 21, 2004 10:15 am    Post subject: Re: Evaluating expressions with side effects. "Jason Heyes" <jasonheyes (AT) optusnet (DOT) com.au> wrote Quote: Are the side effects of evaluating expr1 resolved before expr2 is evaluated? if (expr1 && expr2) Yes, but only if expr1 and expr2 evaluate to fundamental types (eg. bool or int). This is called short circuting. If expr1 and expr2 evaluate to a class type with on overload operator&&, then the order is unspecified, as this is just a function call. Back to top Jason Heyes Guest Posted: Tue Dec 21, 2004 12:03 pm    Post subject: Re: Evaluating expressions with side effects. "Sharad Kala" <no_spam.sharadk_ind (AT) yahoo (DOT) com> wrote Quote: "Jason Heyes" <jasonheyes (AT) optusnet (DOT) com.au> wrote in message "Alf P. Steinbach" <alfps (AT) start (DOT) no> wrote in message asking others to do it for you. Does this mean I can't ask questions here anymore? Not at all. I think the point Alf is making is that to write correct and authoritative programs one needs to have a copy of Standard. As you may be aware that not always compilers get correct results. What do you do then ? The answer is the Holy Standard. But I do agree that if you don't require to use C++ daily, or in depth then probably Standard is not what you may want to read. But for a serious C++ programmer it is a must. Ok I understand. Where can I get the standard? Back to top Sharad Kala Guest Posted: Tue Dec 21, 2004 12:16 pm    Post subject: Re: Evaluating expressions with side effects. "Jason Heyes" <jasonheyes (AT) optusnet (DOT) com.au> wrote in message Quote: "Sharad Kala" <no_spam.sharadk_ind (AT) yahoo (DOT) com> wrote in message news:32q5m7F3oj81cU1 (AT) individual (DOT) net... Ok I understand. Where can I get the standard? http://www.parashift.com/c++-faq-lite/big-picture.html#faq-6.12 Sharad Back to top Karl Heinz Buchegger Guest Posted: Tue Dec 21, 2004 1:22 pm    Post subject: Re: Evaluating expressions with side effects. Siemel Naran wrote: Quote: "Jason Heyes" <jasonheyes (AT) optusnet (DOT) com.au> wrote in message news:41c7cdaf$0$1121 Are the side effects of evaluating expr1 resolved before expr2 is evaluated? if (expr1 && expr2) Yes, but only if expr1 and expr2 evaluate to fundamental types (eg. bool or int). This is called short circuting. Note that this is not what the OP was asking about. In C++ speak the OP asked: Is there a sequence point at && -- Karl Heinz Buchegger [email]kbuchegg (AT) gascad (DOT) at[/email] Back to top red floyd Guest Posted: Tue Dec 21, 2004 5:17 pm    Post subject: Re: Evaluating expressions with side effects. Jason Heyes wrote: Quote: [redacted] Ok I understand. Where can I get the standard? Borders/Amazon has it in hardback (Wiley Press) for about $65. I think it includes TC1. http://www.amazon.com/exec/obidos/tg/detail/-/0470846747/qid=1103649420 Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ language (comp.lang.c++) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.