dev-cpp-users Mailing List for Dev-C++

Guard statements are lines like these in your header files:

#ifndef FOOHEADER_H
#define FOOHEADER_H

int foo;
char *foostring;
//...

#endif

Then if two files include foo.h, it won't be recompiled because FOOHEADER_H
has already been defined.

At 04:12 PM 11/10/2003 -0700, David McKen wrote:
>Explain.
>
>----- Original Message ----- 
>From: <age...@co...>
>To: <ci...@ya...>
>Sent: Saturday, October 11, 2003 12:12 PM
>Subject: Re: [Dev-C++] Where to include files
>
>
>> Guard statements can prevent this.
>> 
>> --
>> ~~Scott Simontis~~
>> Programmer
>> > As far as  I know there are no "rules". However here is my rule
>> > "Include in
>> > the .cpp, if it gives you errors put it in the .h".
>> > 
>> > The main reason you don't want to put it in the .h is because the
>> > header
>> > will be included in EVERY single file that includes your header
>and
>> > (this is
>> > the killer) is recompiled every time one of those files is
>> > re-compiled. If
>> > the header is in the .cpp then it is only re-compiled when the
>.cpp
>> > changes.
>> > 
>> > Of course if you have some super computer avalible then this
>reason
>> > goes out
>> > the window. If you don't then this is about the only reason I can
>> > think of.
>> > 
>> > Signed
>> > David McKen
>> > 
>> > 
>> > ----- Original Message ----- 
>> > From: "Glen Vermeylen" <gve...@pa...>
>> > To: <dev...@li...>
>> > Sent: Saturday, October 11, 2003 10:32 AM
>> > Subject: [Dev-C++] Where to include files
>> > 
>> > 
>> > > Hi, I was wondering where I should best place my include files.
>> > > Suppose I have a class testClass which needs to include a
>couple of
>> > files.
>> > > Should I place the include-statements in the .cpp files or in
>the
>> > .h (so
>> > > one could see which files are needed?)?
>> > > Or does it depend on the circomstances? For example:
>include-files
>> > which
>> > > contain the type of declared members in the header, and
>> > include-files
>> > > needed for the implementation in the .cpp file?
>> > > Are there rules, or am I free to choose?
>> > >
>> > > Please enlighten me :-) .
>> > >
>> > >
>> > >
>> > > -------------------------------------------------------
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Ahh, I see where you are coming from.

What those statements won't quard against is compiling files that
simply aren't required.

e.g. If your class uses math.h you would only include it in the .cpp
file. This prevents any .cpp files that include your header from
having to compile in math.h (unless they include it themselves).

I don't believe the question posed is how to prevent multiple
inclusion, if I mis-interpreted then your answer would work
perfectly.

Signed
David McKen

--- age...@co... wrote:
> Whereever you may be putting your include files, try something like
> this:
> #ifndef __HEADERNAME_H__
> #define __HEADERNAME_H__
> #endif
> 
> Or, you can use #pragma statements. I am not sure about #pragmas,
> as they depend on compilers. Check the MinGW docs.
> 
> --
> ~~Scott Simontis~~
> Programmer
> > Explain.
> > 
> > ----- Original Message ----- 
> > From: <age...@co...>
> > To: <ci...@ya...>
> > Sent: Saturday, October 11, 2003 12:12 PM
> > Subject: Re: [Dev-C++] Where to include files
> > 
> > 
> > > Guard statements can prevent this.
> > > 
> > > --
> > > ~~Scott Simontis~~
> > > Programmer
> > > > As far as  I know there are no "rules". However here is my
> rule
> > > > "Include in
> > > > the .cpp, if it gives you errors put it in the .h".
> > > > 
> > > > The main reason you don't want to put it in the .h is because
> the
> > > > header
> > > > will be included in EVERY single file that includes your
> header
> > and
> > > > (this is
> > > > the killer) is recompiled every time one of those files is
> > > > re-compiled. If
> > > > the header is in the .cpp then it is only re-compiled when
> the
> > .cpp
> > > > changes.
> > > > 
> > > > Of course if you have some super computer avalible then this
> > reason
> > > > goes out
> > > > the window. If you don't then this is about the only reason I
> can
> > > > think of.
> > > > 
> > > > Signed
> > > > David McKen
> > > > 
> > > > 
> > > > ----- Original Message ----- 
> > > > From: "Glen Vermeylen" <gve...@pa...>
> > > > To: <dev...@li...>
> > > > Sent: Saturday, October 11, 2003 10:32 AM
> > > > Subject: [Dev-C++] Where to include files
> > > > 
> > > > 
> > > > > Hi, I was wondering where I should best place my include
> files.
> > > > > Suppose I have a class testClass which needs to include a
> > couple of
> > > > files.
> > > > > Should I place the include-statements in the .cpp files or
> in
> > the
> > > > .h (so
> > > > > one could see which files are needed?)?
> > > > > Or does it depend on the circomstances? For example:
> > include-files
> > > > which
> > > > > contain the type of declared members in the header, and
> > > > include-files
> > > > > needed for the implementation in the .cpp file?
> > > > > Are there rules, or am I free to choose?
> > > > >
> > > > > Please enlighten me :-) .
> > > > >
> > > > >
> > > > >
> > > > > -------------------------------------------------------
> > > > > This SF.net email is sponsored by: SF.net Giveback Program.
> > > > > SourceForge.net hosts over 70,000 Open Source Projects.
> > > > > See the people who have HELPED US provide better services:
> > > > > Click here: http://sourceforge.net/supporters.php
> > > > > _______________________________________________
> > > > > Dev-cpp-users mailing list
> > > > > Dev...@li...
> > > > > TO UNSUBSCRIBE:
> http://www23.brinkster.com/noicys/devcpp/ub.htm
> > > > > https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> > > > 
> > > > 
> > > > __________________________________
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> > > > 
> > > > 
> > > > -------------------------------------------------------
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> > 
> > __________________________________
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> > 
> > 
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=====
Signed 
David Mcken

Life Sucks
Live with it

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