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C++ Question

Started by nickvbs Feb 21, 2003 at 3:07 PM 2 replies 200+ views

Original Post

Feb 21, 2003 at 3:07 PM

I was wondering if theres a way you can write a piece of code and store it in a structure/class as a function so that each instance of the structure/class has a different function depending on what code u stored in it..I dont know, maybe my thinking process is messed up.lol. Also how could I make a function parameter be another function, for example, the qsort function lets u pass in a compare function as the 4th parameter.

civguy

Feb 21, 2003 at 3:14 PM

www.function-pointer.org

Just read on from the introduction, it answers your questions

falkone

Feb 21, 2003 at 3:15 PM

I don''t think the qsort function takes a compare function.. i think it takes the result of the compare function... the only way to pass a function i think would be to use a function pointer..

as for a piece of code that does whatever.. i can''t make out what you''re trying to ask

fizban75

Feb 21, 2003 at 3:15 PM

Simple:

  
struct functor {
  void operator()(int x) {}
};

// use:


class A {
public:
  void call_func(int x) { m_func(x); }

private:
  functor m_func;
};

By use of the operator() method, you can make a class look like a function. Then you can create multiple instances of that "functor" class and store it in different places. That help?

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