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I want to write a macro that spits out code based on the boolean value of its parameter. So say def_const(true) should be expanded into const, and def_const(false) should be. An occurrence of a parameter in a function-like macro, unless it is the operand of # or ##, is expanded before substituting it and rescanning the whole for further expansion.
Macroeconomics is the branch of economics that deals with the overall functioning of the economy. Macroeconomic policies have a critical influence on the decisions of households. C and c++ languages explicitly prohibit forming preprocessor directives as the result of macro expansion. This means that you can't include a preprocessor directive into a macro. Before reading your question, i thought you were asking whether a macro definition can define another macro, such as #define foo(x) #define bar x. The answer to that question (which. The macro names are things like this:
Before reading your question, i thought you were asking whether a macro definition can define another macro, such as #define foo(x) #define bar x. The answer to that question (which. The macro names are things like this: $(my_whatever_include_dir) i could manually replace every single macro with the real path, but it would be nice to just use the macros. I know that this is a long time after the original query, but this may still be useful. This can be done in gcc using the stringify operator #, but it requires two additional stages to be defined first. The definition is accessible inside the makefile. I also pass macro definitions from the makefile to the source code using the similar compiler option: -dname=value (supported in many.
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