Questions tagged [ifdefine]
37 questions
188
votes
7 answers
C++ compiling on Windows and Linux: ifdef switch
I want to run some c++ code on Linux and Windows. There are some pieces of code that I want to include only for one operating system and not the other. Is there a standard #ifdef that once can use?
Something like:
#ifdef LINUX_KEY_WORD
...…
Sardathrion - against SE abuse
- 14,083
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15
votes
6 answers
Apache .htaccess - applying basic authentication conditionally based on environment or hostname
My dev setup: Mac OSX 10.7.4 / Apache 2.2.21 / PHP 5.3.10
I wish to add conditional logic to my .htaccess files depending on dev vs live environment. for example i want to have authentication on the live server but not on the dev server. i have in…
Devin Emke
- 169
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7
votes
3 answers
Why include direct.h or sys/stat.h conditionally based on _WIN32 or __linux__?
What will the following code do? Why is it used?
#ifdef _WIN32
#include
#elif defined __linux__
#include
#endif
Bosnia
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6
votes
2 answers
#ifdef #else #endif choose iOS sdk version and function?
I am buliding a dark themed iOS 6 and 7 app. I understand I can call [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent]; to make the iOS 7 status bar suit a dark color theme application.
The problem is I am going to…
HYC
- 59
- 1
- 1
- 7
5
votes
3 answers
How to do conditional .htaccess password protect
I'm trying to password protect a specific url using a .htaccess. Different urls point to the same files but have different workings. I now need to password protect only one url. I'm trying to do this using setenvif but it doesn't seem to work. I…
Clooner
- 141
- 2
- 9
4
votes
1 answer
#error inside of #define - Possible in C++ (generate error WHEN calling macro MyMacro IF some constant is not defined)?
I want to define the macro, that based on some condition (existence of #define INITED, not the parameter of the macro) will return value, or generate compiler's error, like:
#error Not initialized!
I've tried (for myIdea.h):
#ifdef INITED
…
PolGraphic
- 2,941
- 9
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- 100
3
votes
4 answers
SetEnvIf HTTP_HOST not working
I can't get it work this part of .htaccess, the IfDefine never runs. What am I doing wrong, setenvif mod is enabled.
RewriteBase /
SetEnvIf HTTP_HOST ^localhost$ local
RewriteBase /codeigniter-app/
SetEnvIf HTTP_HOST…
Alex
- 7,089
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- 141
3
votes
5 answers
Using C X macros in combination with #ifdef
Assuming my code looks like in the following snippet:
#ifdef COND1
extern int func1(void);
#endif
...
#ifdef CONDN
extern int funcn(void);
#endif
my_struct funcs[] = {
#ifdef COND1
{"func1 description", func1},
#endif
...
#ifdef CONDN
…
Cenk Gündoğan
- 51
- 4
3
votes
2 answers
How to use a variable from a Makefile in #ifdef in C++ file
Makefile
ifeq ($(wifiSim),1)
WIFISIM :=1
endif
all: test.cpp
test.cpp : test.o
./a.out
test.o :
c++ test.cpp
test.cpp
#include
using namespace std;
int main()
{
#ifdef WIFISIM
cout <<…
a2n3k7it
- 55
- 1
- 6
3
votes
2 answers
Conditional Directory Index In Htaccess
This relates to the question in:
conditional DirectoryIndex in .htaccess
The answer states that the following should work:
SetEnvIf Remote_Addr ^127\.0\.0\.0$ owner
DirectoryIndex index.html
…
Lizard
- 39,504
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3
votes
3 answers
How to #define based on iOS version?
I have a Constants.h file in my app, where I #define app-wide things for easy access later. I'm having a hard time, though, #defineing based on iOS version. Here's what I've tried:
#ifdef __IPHONE_7_0
#define kHamburgerImage [UIImage…
Undo
- 25,204
- 37
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2
votes
1 answer
Check is member in struct with C
I want to access to member in struct but check if this member exist
#include
int main()
{
struct MyStruct { int a;};
struct MyStruct temp ;
temp.a=3;
return 0;
}
Is there a way to check if member a is in struct m and if…
MicrosoctCprog
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- 12
2
votes
2 answers
purpose of #ifdef before main() in program
What is the purpose of the #ifdef below? And why does it allow me to step through my program when debugging it (active solution configuration = debug) but not when the active solution configuration = release or when building the solution and the…
traggatmot
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1
vote
1 answer
How to know the version of the C# using the preprocessor?
My project in Debug mode contains constructs that only supports C# 7.3. But in Release mode, the project should be built on C# 7.0 without specific code lines.
I know about some standard preprocessor symbols like NET472 and NETSTANDARD2_0 but it…
groser
- 215
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1
vote
2 answers
Why directive not working (Apache 2.4)?
I'm trying to block a IP list generated by CustomLog using IfDefine to avoid log ip again, but it's not working. I changed CustomLog conditional and something bizarre behavior can be observed:
RewriteMap blacklist…
Arthur Ronconi
- 1,634
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