As far as I know, what you're trying to do (use if statement and then return a value from a macro) isn't possible in ISO C... but it is somewhat possible with statement expressions (GNU …

Nov 27, 2015 · In the normal C or C++ build process the first thing that happens is that the PreProcessor runs, the preprocessor looks though the source files for preprocessor directives …

You could indeed perform those check, at the cost of increased volume and complexity of code. The pythonic way is to assume the happy path (all types correct) is being followed, and cross …

Oct 28, 2009 · #define is a compiler pre processor directive and should be used as such, for conditional compilation etc.. E.g. where low level code needs to define some possible …

#define is a special "before compile" directive in C# (it derives from the old C preprocessor directives) that defines a preprocessor symbol. Coupled with #if , depending on what symbols …

Aug 24, 2010 · Macros (created with #define) are always replaced as written, and can have double-evaluation problems. inline on the other hand, is purely advisory - the compiler is free …

Aug 19, 2008 · #define is used to define compile-time constants that you can use with #if to include or exclude bits of code. #define USEFOREACH #if USEFOREACH foreach(var item in …

Jun 18, 2012 · The scope of #define is limited to the file in which it is defined. So, #defines which are created in one source file are NOT available in a different source file. In short, #defines …

DEFINE is a preprocessor instruction (for example, #define x 5). The compiler takes this value and inserts it wherever you are calling x in the program and generate the object file. "Define" …

i need to share some strings in my c++ program. should i use #define or const string? thanks mystring1.h #define str1 "str1" #define str2 "str2" Or mystring2.h extern const string str1;