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  • Why are #ifndef and #define used in C++ header files?
    Those are called #include guards Once the header is included, it checks if a unique value (in this case HEADERFILE_H) is defined Then if it's not defined, it defines it and continues to the rest of the page When the code is included again, the first ifndef fails, resulting in a blank file That prevents double declaration of any identifiers such as types, enums and static variables
  • system verilog - Include guards in SystemVerilog - Stack Overflow
    `ifdef, `ifndef, `define, and other related ` operations are dependent on compile order Macro definitions exist in the global space from moment they are defined until they are undefined In the example above, once MY_GUARD is defined any `ifndef MY_GUARD will evaluate to false until it is undefined (`undef MY_GUARD)
  • What is the recommended naming convention for include guards?
    Personally, I feel that adding the extension is redundant, but I like the way _INCLUDED actually says what it stands for, +1 for that My preference is to use INCLUDE_GUARD_FOO (without the redundant _H, we only ever need include guards for headers, after all) which is even a bit more to the point imho, but that's a matter of taste, really
  • c++ - #pragma once vs include guards? - Stack Overflow
    Where the include guard was internal it took 50 times as long compared with where the include guard was external (external include guards are at least as good as #pragma) But let's consider the possible affect of this: According to the tables presented, the time to open the include and check it is 50 times that of a #pragma equivalent
  • macros - What exactly do C include guards do? - Stack Overflow
    This header file has an include guard However, I'm kind of confused as to what #define HEADER_FILE is actually doing Let's say I were to forget the include guard, it would have been perfectly legal for me to completely ignore adding '#define HEADER_FILE' What exactly are we doing when we define HEADER_FILE? What are we defining? And why is it okay to forget the include guard in which case
  • #ifndef syntax for include guards in C++ - Stack Overflow
    In your example: you don't show us the #define HEADER_H Is it somewhere in header h? If so, how do you know that the author of header h chose to use HEADER_H as the name of the include guard macro? What if it changes to something else later? If you decide to put the include guard in the including file, you should define the macro there as





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