why use static function here? - 未名空间MITBBS历史存档

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why use static function here?

why use static function here?# Programming - 葵花宝典

g*n2005-07-21 07:07

1 楼

from effective C++ (2nd ed) item 28
struct widgets{
class widget {....};

static const Widget operator+(const Widget& lsh, const Widget& rhs);
....
};
I am wondering why declare a overloaded operator static?

a*e2005-07-21 07:07

2 楼

I understand that, for the derivative classes. They have the common entrance
(address) for their functions.
But I admit I don't find any advantage for operator overload case.

【在 g*****n 的大作中提到】

: from effective C++ (2nd ed) item 28
: struct widgets{
: class widget {....};
:
: static const Widget operator+(const Widget& lsh, const Widget& rhs);
: ....
: };
: I am wondering why declare a overloaded operator static?

X*r2005-07-21 07:07

3 楼

I don't think you can overload operator + as a static member.
Quote:
13.5.2 Binary operators [over.binary]
1 A binary operator shall be implemented either by a non-static member
function (_class.mfct_) with one parameter or by a non-member function
with two parameters. Thus, for any binary operator @, [email protected] can be
interpreted as either [email protected](y) or [email protected](x,y). If both forms
of the operator function have been declared, the rul

【在 g*****n 的大作中提到】

g*n2005-07-21 07:07

4 楼

but stott meyers's effective C++ use it. Maybe there is some subtle meaning, b
ut i can not figure out.

【在 X****r 的大作中提到】

: I don't think you can overload operator + as a static member.
: Quote:
: 13.5.2 Binary operators [over.binary]
: 1 A binary operator shall be implemented either by a non-static member
: function (_class.mfct_) with one parameter or by a non-member function
: with two parameters. Thus, for any binary operator @, [email protected] can be
: interpreted as either [email protected](y) or [email protected](x,y). If both forms
: of the operator function have been declared, the rul