Question

I am facing a compilation error on using transform:

It is related to my previous question: C++: How to copy a string object to an int array?)

enter code here

 class BinaryCode {

    public:
            int get_digit(char c)
            {
                    return c-'0';
            }
            void decode(string decd)
            {
                    int i;

                    std::vector<int>decoded(decd.size());
                    std::transform(decd.begin(), decd.end(), decoded.begin(), get_digit);

                    int length=decoded.length();

The error is:

enter code here

[root@localhost topcoder]# g++ prog1.c
 prog1.c: In member function `void BinaryCode::decode(std::string)':
 prog1.c:20: error: argument of type `int (BinaryCode::)(char)' does not match `int (BinaryCode::*)(char)'

Can anyone please help me? I am using a gcc (g++) compiler.

Answer 1

The best IMHO would be to change the definition of

        int get_digit(char c)

to

        static int get_digit(char c)

It should work with this (static function). It is possible to transform using member functions, but it’s slightly more complicated. Moreover, you don’t need it.