include-guards Questions
2
Solved
I recently started working on a project where I came across this:
#include <string.h> // includes before include guards
#include "whatever.h"
#ifndef CLASSNAME_H // header guards
#define CL...
Mendy asked 29/4, 2015 at 20:43
3
I always placed my #include after the #ifdef/#define Include-Guard. Now the refactor mechanism of my IDE (Qt Creator) put it before the Include-Guard e.g.
#include "AnotherHeader.h"
#ifndef MYHEA...
Dedicated asked 8/1, 2014 at 6:43
3
Solved
http://en.wikipedia.org/wiki/Pragma_once
Should I still use include guards when all of these compilers support #pragma once?
A lot of responses on stack overflow say to use both for compatibility...
Wrongdoer asked 12/11, 2012 at 6:46
4
Solved
I am used to putting header guards around my objects like:
#ifndef SOMETHING_H
#define SOMETHING_H
class Something {
...
}
#endif
but I have been given code where they also do:
#ifndef SOMETHI...
Midge asked 6/11, 2013 at 0:1
4
Solved
I am wondering if/ what include guards exist in files like windows.h, math.h, iostream, stdio... etc.
Since I have those headers included multiple times in different files. Do those files already h...
Vines asked 2/11, 2013 at 3:37
2
Solved
I have 3 *.c files (file1.c, file2.c and file3.c) and 1 *.h file (file3.h) in a project (Visual Studio).
/*******************************
file3.h
********************************/
#ifndef FILE3_H
...
Finalize asked 21/8, 2013 at 11:30
2
Solved
I usually write them as (for example.h):
#ifndef _EXAMPLE_H_
#define _EXAMPLE_H_
#include "example.h"
#endif
Does underscore convention matter? I've seen conflicting information when I g...
Neglect asked 25/6, 2013 at 21:6
4
Solved
Possible Duplicate:
What is the difference between #import and #include in Objective-C?
What is the difference between
#include< >
#include" "
#import< >
#import" "
Clackmannan asked 6/11, 2012 at 11:40
2
Solved
All of my header files use include guards as well as pragma once:
#pragma once
#ifndef FILE_NAME_H
#define FILE_NAME_H
class foo
{
//foo interface..
};
#endif /* FILE_NAME_H */
I understand t...
Pointing asked 28/5, 2012 at 4:13
2
Solved
Is it possible (and how) to add the namespace in the name of the automatic generated include guards in Eclipse CDT, when creating a new class using the .hpp/.cpp templates?
For me Eclipse generate...
Mayweed asked 19/8, 2010 at 10:41
9
Solved
I am currently working on a big project and maintaining all those include guards makes me crazy! Writing it by hand is frustrating waste of time. Although many editors can generate include guards t...
Clientage asked 8/11, 2009 at 8:52
2
Solved
I have seen #ifndef ABC and #if !defined (ABC) in the same C source file.
Is there subtle difference between them?
(If it is a matter of style, why would someone use them in the same file)
Purpose asked 23/12, 2011 at 15:27
3
Solved
So I know how to place an include guard in my own header files with the standard
#ifndef ...
#define ...
Now, My question is about including libraries that are not my own. would be a good exampl...
Princely asked 13/12, 2011 at 3:24
6
Solved
For some reason, I'm getting multiple declarations of content within my header file even though I'm using header guards. My example code is below:
main.c:
#include "thing.h"
int main(){
printf(...
Cityscape asked 28/10, 2011 at 7:16
3
Solved
In C++, I have a problem with a double include:
File stuffcollection.h
#pragma once
#ifndef STUFFCOLLECTION_H
#define STUFFCOLLECTION_H
#include "Stage.h"
class Stuffcollection {
public:
bool...
Tassel asked 5/10, 2011 at 18:29
2
Solved
I have been making files like this for awhile:
Does the order make sense? or should the namespace and the #includes be swapped and why.
#ifndef CLASSNAME_H // header guards
#define CLASSNAME...
Lankton asked 3/10, 2011 at 16:54
4
Can anyone explain how to create a header file in C with a simple example from beginning to end.
Ahner asked 18/8, 2011 at 15:25
3
Solved
Is there any difference between placing the #pragma once inside the include guards as opposed to outside?
case 1:
#ifndef SOME_HEADER_H
#define SOME_HEADER_H
#pragma once
case 2:
#pragma once
...
Watering asked 21/3, 2011 at 19:8
6
Solved
I know why include guards exist, and that #pragma once is not standard and thus not supported by all compilers etc.
My question is of a different kind:
Is there any sensible reason to ever not ha...
Gerdes asked 4/3, 2011 at 8:44
9
Solved
How are include guards typically named? I tend to see this a lot:
#ifndef FOO_H
#define FOO_H
// ...
#endif
However, I don't think that's very intuitive. Without seeing the file name it's diffic...
Heckle asked 1/2, 2011 at 20:23
3
Solved
Is that the right way to have functions in namespace that i will #include in multiple files?
test.h
#pragma once
#ifndef TEST
#define TEST
namespace test{
namespace {
bool test(){
return...
Idell asked 28/1, 2011 at 11:16
5
At LearnCpp.com | 1.10 — A first look at the preprocessor. Under Header guards, there are those code snippets:
add.h:
#include "mymath.h"
int add(int x, int y);
subtract.h:
#include &quo...
Transpadane asked 22/1, 2011 at 9:17
4
Solved
I currently do the following and the compiler (MSVC2008 / as well as 2010) doesn't complain about it but I'm not sure if it's a bad idea or not:
#ifndef FOO_H_
#define FOO_H_
// note, FOO_H_ is n...
Thithia asked 11/8, 2010 at 18:43
4
Solved
I have a C++ file like this
#ifndef _MOVE_H
#define _MOVE_H
class Move {
int x, y;
public:
Move(int initX = 0, int initY = 0) : x(initX), y(initY) {}
int getX() { return x; }
void setX(int ne...
Bouillabaisse asked 27/7, 2010 at 15:22
3
Solved
Is there a way in PHP to try to include a file, but if the file contains errors that stop it from compiling to just skip that file from inclusion?
Puparium asked 6/6, 2010 at 0:8
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