Question

I am attempting to change a value in a vector which is a variable in a class using a function of a class. When I compile, i get the following errors pointing to the “check[c] = cval;” line:

• error C3867: ‘acc::check’: function call missing argument list; use ‘&acc::check’ to create a pointer to member

• error C2109: subscript requires array or pointer type

Note: I have already initialized C to be 0 elsewhere in the program. It might be throwing an error because I am giving the address a variable instead of an integer, but when I substitute the variable with an integer, I still get the same errors.

    #include <iostream>
    #include <fstream>
    #include <string>
    #include <vector>
    #include <cstring>

    using namespace std;

    class acc
    {
    public:
        void add_Cval(double cval);

    private:
        vector<double> check(); //vector of all checks
        int c;                  //loop marker for cvals
    };

    void acc::add_Cval(double cval)
    {
        check[c] = cval;
        c++;
    }

Answer 1

check is a method, not a data member, so you need to invoke it – check().

void acc::add_Cval(double cval)
{
    check()[c] = cval;
    c++;
}

or make it a data member:

class acc
{
public:
    void add_Cval(double cval);

private:
    vector<double> check; //vector of all checks
    int c;                  //loop marker for cvals
};