I have a macro for a character string as follows: #define APPNAME \"MyApp\" Now I want to construct a wid开发者_高级运维e string using this macro by doing something like:
Is there anyway to see wha开发者_Python百科t you code looks like after the preprocessor has done all the substitutions?For gcc just use the -E switch
I have a lot of legacy code using macro of the form: #define FXX(x) pField->GetValue(x) The macro forces variable pField be in the scope:
I wonder if typedef开发者_StackOverflow中文版 and #define are the same in c?typedef obeys scoping rules just like variables, whereas define stays valid until the end of the compilation unit (or until
I need to have some lines of code \"active\" in debug mode only, and ignored in release mode. Is there a way to do something like this:
in my C project I have five different function (with the same name) which implement one algorithm but in different w开发者_JS百科ays. At compile time I need to select only one of these functions.
I want to know how could we look at the C file after it has been expanded by the preprocessor before compilation with all the macro values put in the code inside the开发者_如何学Go function where ever
I occasionally write code something like this: // file1.cpp #define DO_THIS 1 #if DO_THIS // stuff #endif During the code development I may switch the definition of DO_THIS between 0 and 1.
I have been seeing code like this usually in the start of header files: #ifndef HEADERFIL开发者_运维百科E_H
I have this code to draw an ellipse in the screen but I don\'t understand what does it means the long define statement, and I only want to know how to write the same code without all that confuse defi
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