could if/else avoid syntax checking compile time unreachable code?
I understand most optimisers will not code up blocks which are known at
compile time not to execute.
Should this behaviour be extended in some future standard to complete
ignoring of the unreachable code? Perhaps restricted to {if, else, switch,
case}?
e.g.
if(0)
{
this is not syntax checked
}
else
{
// compiled code
}
This should allow much shorter and clearer implimentation of much current
messy templated traits code.
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stuart
9/17/2003 8:16:33 PM
comp.lang.c++.moderated
10738 articles. 
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allnor
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On 17 Sep 2003 16:16:33 -0400, stuart macgregor
<stuart.191@ntlworld.com> wrote:
>I understand most optimisers will not code up blocks which are known at
>compile time not to execute.
>
>Should this behaviour be extended in some future standard to complete
>ignoring of the unreachable code? Perhaps restricted to {if, else, switch,
>case}?
>
>e.g.
>
>if(0)
>{
>this is not syntax checked
>}
>else
>{
>// compiled code
>}
What about: the following?
if(0)
{
this is not syntax } checked
}
else
{
// compiled code
}
Surely the syntax /has/ to parse for the compiler to know where the
reachable code resumes?
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Tim
9/18/2003 9:56:33 AM
On 17 Sep 2003 16:16:33 -0400, stuart macgregor
<stuart.191@ntlworld.com> wrote in comp.lang.c++.moderated:
> I understand most optimisers will not code up blocks which are known at
> compile time not to execute.
>
> Should this behaviour be extended in some future standard to complete
> ignoring of the unreachable code? Perhaps restricted to {if, else, switch,
> case}?
>
> e.g.
>
> if(0)
> {
> this is not syntax checked
> }
> else
> {
> // compiled code
> }
Since you're asking for opinions, mine is a resounding NO. If nothing
else, you could get nasty surprises if/when the time comes that you do
want that section compiled.
If you don't want the code compiled, you have two choices:
/*
this is not syntax checked
*/
.....or:
#if 0
must parse to valid pp tokens, but need not be syntactically
or semantically valid C++
#endif
--
Jack Klein
Home: http://JK-Technology.Com
FAQs for
comp.lang.c http://www.eskimo.com/~scs/C-faq/top.html
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alt.comp.lang.learn.c-c++ ftp://snurse-l.org/pub/acllc-c++/faq
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Jack
9/18/2003 10:01:37 AM
On 17 Sep 2003 16:16:33 -0400, stuart macgregor
<stuart.191@ntlworld.com> wrote:
>I understand most optimisers will not code up blocks which are known at
>compile time not to execute.
>
>Should this behaviour be extended in some future standard to complete
>ignoring of the unreachable code? Perhaps restricted to {if, else, switch,
>case}?
>
>e.g.
>
>if(0)
>{
>this is not syntax checked
Say what?
How are you doing to determine what the boundaries of the
unreachable block are if you do not check for syntax? Did you mean
that the section should not be checked for semantics?
>}
>else
>{
>// compiled code
>}
>
>This should allow much shorter and clearer implimentation of much current
>messy templated traits code.
Sincerely,
Gene Wirchenko
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Gene
9/19/2003 10:00:51 AM
As others have pointed out, the unreachable code has to be syntax
checked. But it might not need to be typechecked or checked for names
that are in scope (calls to nonexistent functions, etc).
However it would be too confusing if the normal 'if' started to not
give errors for code that the compiler considers unreachable (and
different compilers will have different levels of intelligence on
that). Better to have a separate 'cif' (compile-time if) where the
condition must be a compile-time expression.
--
Ed Avis <ed@membled.com>
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Ed
9/21/2003 6:54:58 PM
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Can anyone let me know whether a .m code compiled and included as a library/header file in C (application deployment) runs faster as compared to running on matlab environment? "Rubal " <rub_dua_06@yahoo.com> schrieb im Newsbeitrag news:fm6oen$61m$1@fred.mathworks.com... > Can anyone let me know whether a .m code compiled and > included as a library/header file in C (application > deployment) runs faster as compared to running on matlab > environment? No, it won't. Since R14 the compiled code and the interpreted code run on same speed, because the code is not...
How to compile this C Code in Dev-C++??
I have done the following: New Project -> Console Application -> C Project. Then I get the following text: #include <stdio.h> #include <stdlib.h> int main(int argc, char *argv[]) { system("PAUSE"); return 0; } But where do I write my own C code? I have written the following code: void c(unsigned int n) { while (n > 1) if ((n & 1) == 0) n = n/2; else n = 3 * n + 1; } But where should I put it and how do I compile it? js * JS: > I have done the following: New Project -> Console Application -> C Project. Off-topic on two groun...
C++0x/1x exception specifications proposal: Compile-time checked
Perhaps a mechanism can be introduced in the C++0x/1x standard, something simple like defining a function as: void somefunc(void) throw() { // ... } and getting a compile time error saying something like: "Error: void somefunc(void) throw(): Wrong exception specification. somefunc can throw std::bad_alloc, std::range_error". That is make the compiler to check exception specifications for errors too. Ioannis A. Vranos In article <fmvvf1$1i2i$1@ulysses.noc.ntua.gr>, ivranos@no.spamfreemail.nospam.gr says... > Perhaps a mechanism can be introduced in the C++0x/1...
C++0x/1x exception specifications proposal: Compile-time checked
Perhaps a mechanism can be introduced in the C++0x/1x standard, something simple like defining a function as: void somefunc(void) throw() { // ... } and getting a compile time error saying something like: "Error: void somefunc(void) throw(): Wrong exception specification. somefunc can throw std::bad_alloc, std::range_error". That is make the compiler to check exception specifications for errors too. Ioannis A. Vranos -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Ioannis Vranos w...
using Dev-C++ to compile ONLY C code ?
Hi there, don't know if it's the right group, but I'll try anyway. Sorry if I'm OT, anybody can be so patient to tell me the right group ? Thanks :) Anyway, the question is: I know I can write C programs using a C++ environment like Dev-C++. However, I'd like to know if there are some options that allow Dev to ignore C++ syntax and act as a C-only compiler. Is this possible ? And, if not, can anybody suggest me a free C compiler under Windows ? Thanks a lot. -- Emanuele Blanco PGP Key Available - http://studenti.unina.it/~emblanco/key.asc "Emanuele Blanco"...
Why would someone use c++ compiler on a C code?
Would it suppress errors? Is he trying to hide errors in his code? On Apr 7, 9:56 pm, 2005 <FW3...@sbcglobal.net> wrote: > Would it suppress errors? > > Is he trying to hide errors in his code? He is using g++ on a *.c code! Also what is so different between gcc & cc compiler - any advantages? 2005 wrote: > Would it suppress errors? > > Is he trying to hide errors in his code? Probably the reverse, C++ and its compilers are more pedantic about a number of issues, particularly type safety. Do bear in ming there are sometimes obscure semantic differences betw...
Compile c/c++ code on a pocket pc?
Hi, my name is Sean and I was wondering if it's possible to compile c/c++ code on a pocket pc running windows ce. Is it possible? On 25 Apr 2005 07:56:34 -0700, "twoeyedhuman1111" <twoeyedhuman1111@gmail.com> wrote: >Hi, my name is Sean and I was wondering if it's possible to compile >c/c++ code on a pocket pc running windows ce. Is it possible? The closest I know about is PocketC: http://www.orbworks.com/wince/index.html I've never tried it, so I can't say more. The only other C/C++ compilers I know about require cross-compilation (develop and build on desktop, run on handheld). I _think_ gnu has some support. Microsoft provides eVC, which is available free (_large_ download); I don't know the web location offhand, but your can probably find it by going to www.microsoft.com and searching for evc (search box in top right corner). For some other possibilities, see: http://www.cewindows.net/developer/languages.htm ----------------------------------------- To reply to me, remove the underscores (_) from my email address (and please indicate which newsgroup and message). Robert E. Zaret, eMVP PenFact, Inc. 500 Harrison Ave., Suite 3R Boston, MA 02118 www.penfact.com "twoeyedhuman1111" <twoeyedhuman1111@gmail.com> wrote: > > > Hi, my name is Sean and I was wondering if it's possible to compile > c/c++ code on a pocket pc running windows ce. Is it possible? there is a port of gcc called pgcc th...
Sequitur C/C++ code
Hello, Has perhaps anyone tried the Sequitur C/C++ code available at http://sequitur.rutgers.edu/sequitur (follow the link "Full source") ? Judging from the Makefile, it is supposed to be compiled using gcc, but I have tried several versions of gcc under both Linux and Windows, and it either doesn't compile (there are include files required that do actually not exist), or it does, but crashes when ran. I would appreciate it if someone who successfully managed to compile the code and run the resulting program, told me using which compiler/settings/platform/... they did it. Tha...
Compile C/C++ code and connect it to matlab
Hello, I want to compile a C++ code and connect it to matlab. Can anyone pls tell me how i should do it. I tried doing it using mex with some built in matlab c codes, but these c codes are very diff from what i have written. My c code is the normal c code that we write.I am naive regarding this and so kindly explain as much as possible. Thanks, Prads On 27 Okt, 02:57, prads <kashya...@gmail.com> wrote: > Hello, > I want to compile a C++ code and connect it to matlab. Can anyone pls tell me how i should do it. I tried doing it using mex with some built in matlab c codes, but thes...
is c the best? why does everything else compile to c?
Is it jsut the truth that you have to learn c? I know almost no programming and want to learn and build killer apps 1 people say use java its the best for getting large complex thgns done 2 learn perl because it has msot code online and great frameworks and is faster to develop than java 3 learn clisp becauase it has most power and real macros 4 learn haskell because it has lazy evaluation and strong types eliminate errors 5 learn ruby because it maximizes programming ease and has good libraries 6 learn tcl beacuase it is simple and has gui abilities 7 learn smalltalk becasue oo i sbest way to...
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