What do these tow lines of code mean?

This is a discussion on What do these tow lines of code mean? within the C++ Programming forums, part of the General Programming Boards category; Can someone explain these two lines of code please, Line one Code: T& operator[] (int i) {return at (i); } ...

  1. #1
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    Apr 2002
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    Unhappy What do these two lines of code mean?

    Can someone explain these two lines of code please,

    Line one
    Code:
    T& operator[] (int i) {return at (i); }
    What is 'operator', and 'at'?

    Line Two
    Code:
    const T& operator[] (int i) const { return at(i);}
    What is going on here?

    Thanks!
    Last edited by Gamma; 04-25-2002 at 07:05 PM.

  2. #2
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    Feb 2002
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    591
    I am not sure if I can explain this good enough but it is operator overloading of [].
    operator is a key word telling the compiler that what is following should be done when the "operator" is found. In this case [] but it could be /*-+ to. at is a function i is the argument; It makes it possible to do things like

    CString one; //Object of CString class
    CString two; //Object of CString class

    one = one + two; //Use the overloaded operators = and + to do something with the CString objects.

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