Thursday, September 19, 2019

c++ - calling template class constructor

Answer



I'm getting hard time figuring out solution for calling constructor of class which uses templates.




--Header file



template 
class Binary_tree
{
    string file_name;

    list arr_data;
public:
    Binary_tree(string fname);

    void printArr();
};


--cpp file



template 

Binary_tree::Binary_tree(string fname)
{
    File_Name = fname;

    total = 0;
    root = nullptr;

    std::ifstream filestream(fname);
    string line;

    while (!filestream.eof())
    {
        filestream >> line;
        arr_data.push_back(line);

    }
}

template 

void Binary_tree::printArr()
{
    int size = arr_data.size();

    for (int i = 0; i < size; i++)
    {

        cout << "arr_data [" << i << "] is: " << arr_data[i] << endl;
    }
}


--main.cpp



int main(int argc, char** argv)
{
 Binary_tree test(file); 

 test.printArr();

 return 0;
}


Right now I'm getting LNK1120 and LNK2019 errors.

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