所有指派运算子传回的值，都是指派给左运算元的值。
All assignment operators return the value that is assigned to the left operand.
在所有复合指派运算子上，多载二元运算子即隐含多载对等的复合指派。
On all compound assignment operators, overloading the binary operator implicitly overloads the equivalent compound assignment.
这些资料结构不包含建构函式、复制指派运算子，或本身不是PODS的非静态资料成员。
They do not contain constructors, copy assignment operators, destructors, or non-static data members that are not themselves PODS.
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