Error: cannot call member function without object

This is a discussion on Error: cannot call member function without object within the C++ Programming forums, part of the General Programming Boards category; We have been stuck on this for an hour now. We're getting an error: error: cannot call member function 'int ...

  1. #1
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    Error: cannot call member function without object

    We have been stuck on this for an hour now.

    We're getting an error:
    error: cannot call member function 'int GameEvent::makeargv(const char*, const char*, char***)' without object
    Here's our code:
    Code:
    GameEvent* GameEvent::fromString(const Game &g, const string &s){
      const char *inputHold=s.c_str();
      int numArgs=makeargv(inputHold, " ", &buffer);
    
    }
    We have also tried:
    Code:
    GameEvent* GameEvent::fromString(const Game &g, const string &s){
      int sLength=s.size();
        	char* inputHold;
    	string holder=s;
    	inputHold=(char*)malloc(sizeof(char)*sLength);
    	int i;
    	for (i=0;i<sLength; i++) {
    		inputHold[i]=s[i];
    		cout <<inputHold[i];
    	}	
       int numArgs=makeargv(inputHold, " ", &buffer);
    }
    The declaration for makeargv is:
    Code:
    int makeargv(const char *s, const char *delimiters, char ***argvp)
    Any help would be great. Thank you.

  2. #2
    and the Hat of Guessing tabstop's Avatar
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    Is fromString a static function? I can't seem to duplicate your error.

  3. #3
    Registered User NeonBlack's Avatar
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    is fromString() static?
    I copied it from the last program in which I passed a parameter, which would have been pre-1989 I guess. - esbo

  4. #4
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    it is static

  5. #5
    and the Hat of Guessing tabstop's Avatar
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    Then you've got some sort of design problem I guess. (A static function surely can't call a nonstatic member function, since you have to call a (normal) member function from an object.) (EDIT: I suppose you could pass an object into your static function, but at that point we're defeating the purpose I think.)

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    I've looked and asked else where, and I just can't find a solution. Is it the makeargv that's the problem?

  7. #7
    and the Hat of Guessing tabstop's Avatar
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    Quote Originally Posted by TIMBERings View Post
    I've looked and asked else where, and I just can't find a solution. Is it the makeargv that's the problem?
    I guess you could look at it that way. You have (hopefully) made a deliberate design choice to write a static function -- and that comes at a cost. Static functions are somewhat crippled in terms of what parts of the class you can access -- essentially, you can't access anything that belongs to an instance of the class, only those elements that belong to the class-as-a-whole (i.e., the other static elements).

  8. #8
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    fromString() is a static function. The compiler would complain about a call of markargv() if makeargv() is non-static. Non-static function need to be invoked for an object eg. int numArgs=some_object.makeargv(inputHold, " ", &buffer);
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

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