Question

I am new in C++ and I have a basic question for you. It must be basic, I think… 🙂 .

Here is the code that I expect to work but it does not.

char* deneme = Tool::getStringIntoArray("Hello");

I want to get an char array from a static function in the class ‘Tool’ by passing a string into it.

Here is my Tool header:

#include <string>
using namespace std;

#ifndef TOOL_H_
#define TOOL_H_

class Tool
{
public:
    static char* getStringIntoArray(string);
};

#endif

I have learnt that the only thing to use that function is to give a keyword which is ‘static’ there.

Finally, the Tool.cpp for the function:

#include "Tool.h"

char* getStringIntoArray(string str)
{
    int* size = new int(str.size());
    char* array;
    array = new char[*size];

    for ( int i = 0; i < *size; i++) {
        array[i] = str[i];
    }

    delete size;
    return array;
}

Nevertheless it works in the source file where the first code that I gave but when I put this function into a class for static usage, it does not work. The error is shown below :

undefined reference to `Tool::getStringIntoArray(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)' 

Thx.

Answer 1

undefined reference to `Tool::getStringIntoArray(std::basic_string, std::allocator >)’

It’s looking for Tool::getStringIntoArray but you defined getStringIntoArray.

Change the signature in the definition from

char* getStringIntoArray(string str)

to

char* Tool::getStringIntoArray(string str)