"Effective C + +" Reading Notes 10: make operator = returns a reference point to * this
General chain assignment methods:
int x, y, z;
x = y = z = 15; / / is equivalent to x = (y = (z = 15));
When we are to achieve their own operator = operation, the need to return a reference, the reference point to the operator on the left of the parameter; 1 class Widget
5 Widget & operator = (const Widget & rhs)
8 return * this; / / return * this
* This is why the c + + standard to achieve the standard practice of not doing so can also be compiled, but as is the norm, they observe about it.
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