Problem about use an array of pointer-to-member-function?

This is a discussion on Problem about use an array of pointer-to-member-function? within the C++ Programming forums, part of the General Programming Boards category; i writes a test and get trouble, sure. but i don't understand to fix it. please show me why? thank ...

  1. #1
    Registered User PuKa's Avatar
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    Problem about use an array of pointer-to-member-function?

    i writes a test and get trouble, sure. but i don't understand to fix it. please show me why? thank you.
    Code:
    #include <iostream>
    #define CALL_MEMBER_FN(object, ptrToMember) ((object).*ptrToMember))
    class one {
    public:
    	int min(int a, int  b) { return (a<b)?a:b; }
    	int max(int a, int b) { return (a>b)?a:b; }
    };
    typedef int (one::*fp)(int, int);
    int main() {
    	fp farr[] = { &one::min, &one::max };
    	one oo;
    	int ans1 = CALL_MEMBER_FN(oo,farr[0])(2,5);
    	int ans2 = CALL_MEMBER_FN(oo,farr[1])(2,5);
    //	std::cout << "min(2,5) = " << CALL_MEMBER_FN(oo,farr[0])(2,5) << std::endl;
    //	std::cout << "max(2,5) = " << CALL_MEMBER_FN(oo,farr[1])(2,5) << std::endl;
    	return 0;
    }
    /* output:
    arr_fp_c++_0.cc: In function ‘int main()’:
    arr_fp_c++_0.cc:12: error: invalid use of non-static member function
    arr_fp_c++_0.cc:12: error: expected ‘,’ or ‘;’ before ‘)’ token
    arr_fp_c++_0.cc:13: error: invalid use of non-static member function
    arr_fp_c++_0.cc:13: error: expected ‘,’ or ‘;’ before ‘)’ token
    */

  2. #2
    Registered User
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    Brackets in the macro definition are unbalanced.
    Right 98% of the time, and don't care about the other 3%.

  3. #3
    Registered User PuKa's Avatar
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    I got it. thanks very much grumpy.

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