c++ - Preprocessor macros -

c++ - Preprocessor macros -

hello facing next problem. lets assume code looks that

#define function1 functionone #define function2 functiontwo #define call_function ( functionname ) \ someobj someobject.... someobject->functionname();

now problem want check function name , depending on want utilize different someobj. phone call of

call_function(function1)

following code called

someobj someobj... someobj->functionone();

but

call_function(function2) .... someobj2 someobj... someobj->functionone();

first of want discourage using answer. comments say, shooting wrong solution problem.

as purpose learning want provide macro solution:

struct someobj1 { void functionone() { std::cout << "someobj1 functionone"; } }; struct someobj2 { void functiontwo() { std::cout << "someobj2 functiontwo"; } }; #define function1 functionone #define function2 functiontwo #define call_function( funcversion ) \ { \ someobj ## funcversion someobj; \ someobj.function ## funcversion (); \ } int _tmain(int argc, _tchar* argv[]) { call_function(1); call_function(2); homecoming 0; }

c++ macros preprocessor