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Hello all,
I was coding one day a while back, and discovered that #ifndef DEFINITION_NAME was not supported in the compiler I was using through the IDE Code::Blocks, IIRC, and therefore I was forced to change it to #if !defined DEFINITION_NAME instead. I was wondering if the #if !defined version is supported in every C++ standard compliant compiler, in which case I will just always use the #if !defined version.
That's odd. Perusing the relevant chapter of the standard, both are to be supported as part of the language. Neither
#ifndef
or
#if !defined ( identifier )
is an extension to the preprocessor. If one doesn't work, use the other, but there's no good answer here.
Hmm...is there a way to detect which version the compiler which compiles the code supports, and use the one that is, or if both are supported, use the version I pick for default?Quote:
Originally Posted by whiteflags
I really doubt you are seeing what you think you are seeing.
If not, throw the compiler in the garbage.
Ok, maybe you're right. I just tested it again in the compiler of Code::Blocks, and #ifndef worked just fine. Maybe I was mistaken, though I could have sworn I saw a compiler error at that a while back.Quote:
Originally Posted by brewbuck
Oh well. I guess I'll stick with #ifndef then for all header files then, just to be consistent. :p