Creating an assignment (=) operator for class in C++

Possible Duplicate:
Operator overloading

EDIT 2

I was using insert(...) incorrectly, I didn't actually need a '=' operator. Sorry to waste peoples' time. I have voted to close.. 2 votes remain. Please vote.

EDIT

The reason I want an '=' operator is so I can use the insert(...) function on a vector of Derivation objects. At the moment my compiler says:

/usr/include/c++/4.2.1/bits/stl_algobase.h:283: error: no match for 'operator=' in '* __result = * __first'

I have created '==' and '<' operators for my own classes before but I'm struggling to create an '=' operator. My class looks like this (ignore the silly variable names):

class Derivation {
public:
    string                  rc; 
    ImplementationChoice    Y; 
    vector<Derivation>      X;
    vector<string>          D;       
    vector<string>          C;       
    vector<Player>          P, O;   
    vector<Attack>          B;   

    // various functions
    // ...
};

and I want to know what I need to put in

// What do '=' return?  An object of the class right?
Derivation& operator=(const Derivation &d) const {
    // something....
}

Many thanks.

---

First, an assignment operator probably should not be const--

Second, assignment operators usually return a non-const reference to the object that was assigned a value (*this)

---

You don't need one. The compiler-generated one will do just fine.

---

首先删除const ...然后如果你真的需要一个复制操作符 ，那么做一些类似的事情并添加你自己的逻辑（这样它就不会完全做到编译器生成的复制操作符会做什么）：

Derivation& operator=(const Derivation& other) {
    this->rc = other.rc; 
    this->Y = other.Y; 
    this->X = other.X;
    this->D = other.D;       
    this->C = other.C;       
    this->P = other.P;
    this->O = other.O;   
    this->B = other.B;
    // ...
    return *this;
}  

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