c**********e
发帖数: 2007 | 1 Question: In what two ways can an object of type A be automatically
converted into an object of B in C++?
The answer: .... (the first method omitted)
Another method is needed if we wish to be able to convert into objects of
type B when the class declaration is not accessible, for example, suppose B
was the type double: we cannot write a new constructor for doubles. This is
done by defining an operator in the class A whose name is B so we include
the line
operator B() const;
in the class declaration for A. When we define the operator, we code it as
B::operator A() const;
{ // create object of type B and return it ... }
这个答案是不是就是在A里面定义一个函数成员，来overload B()呢？
如果B是double，这个declaration就是
operator double() const;
后面那句答案是不是写反了？我觉得应该是
A::operator B() const;
|
|
