j****g
发帖数: 597 | 1 An interview question.
First he asked what is a const function. I said it's a function that doesn't
change a variable's value.
Then he asked what if you want to change that value in the const function? I
said use mutable. He told me there's other way.
Any idea what is the other way? ? |
k****f
发帖数: 3794 | 2 mutable修饰一下那个变量
't
I
【在 j****g 的大作中提到】
: An interview question.
: First he asked what is a const function. I said it's a function that doesn't
: change a variable's value.
: Then he asked what if you want to change that value in the const function? I
: said use mutable. He told me there's other way.
: Any idea what is the other way? ?
|
t****t
发帖数: 6806 | 3 如果你叙述没问题, 那就是他问得不对
本身一个function没有const 不const的
类成员方法可以用const修饰, 那也不是"doesn't change a variable's value", 而是说
this的类型是const T * const, 就是不能改变类成员
't
I
【在 j****g 的大作中提到】
: An interview question.
: First he asked what is a const function. I said it's a function that doesn't
: change a variable's value.
: Then he asked what if you want to change that value in the const function? I
: said use mutable. He told me there's other way.
: Any idea what is the other way? ?
|
b********n
发帖数: 609 | 4 这位不看贴啊。
【在 k****f 的大作中提到】
: mutable修饰一下那个变量
:
: 't
: I
|
j****g
发帖数: 597 | 5 en, 我觉得他的implication was what thrust said.
Then the question is is there any way to change the value of the member
variable? |
b********n
发帖数: 609 | 6 估计只能const_cast了。
【在 j****g 的大作中提到】
: en, 我觉得他的implication was what thrust said.
: Then the question is is there any way to change the value of the member
: variable?
|
a******e
发帖数: 95 | 7 For fun only. Not portable.
void Test() const
{
int *b = (int*)(int)(&m_num);
*b++;
}
【在 b********n 的大作中提到】
: 估计只能const_cast了。
|
b********n
发帖数: 609 | 8 和const_cast有啥区别？
【在 a******e 的大作中提到】
: For fun only. Not portable.
: void Test() const
: {
: int *b = (int*)(int)(&m_num);
: *b++;
: }
|
