c++ iterator 弱问 - 未名空间MITBBS历史存档

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c++ iterator 弱问

c++ iterator 弱问# Programming - 葵花宝典

a*r2007-09-12 07:09

1 楼

#include
using namespace std;
class A {
public:
void begin() const;
private:
map elements;
map::iterator iter;
};
void A::begin() const {
iter = elements.begin();
~~~~~~~~~~~~~~~这里编译的时候报错，显示no match for operator=
这个该怎么fix呢？
}
int main() {
A a;
a.begin();
return 0;
}

e*a2007-09-12 07:09

2 楼

r u trying to change your "iter" in a "const" method?

【在 a*********r 的大作中提到】

: #include
: using namespace std;
: class A {
: public:
: void begin() const;
: private:
: map elements;
: map::iterator iter;
: };
: void A::begin() const {

a*r2007-09-12 07:09

3 楼

thanks, that is a typo, but i still can't assign elements.begin() to
iter in void A::begin(), do u know how to fix that?

【在 e*a 的大作中提到】

: r u trying to change your "iter" in a "const" method?

t*t2007-09-12 07:09

4 楼

how is that a "typo"? show your "corrected" code.

【在 a*********r 的大作中提到】

: thanks, that is a typo, but i still can't assign elements.begin() to
: iter in void A::begin(), do u know how to fix that?

c*y2007-09-12 07:09

5 楼

const function can not change member data in the class

【在 a*********r 的大作中提到】

: #include
: using namespace std;
: class A {
: public:
: void begin() const;
: private:
: map elements;
: map::iterator iter;
: };
: void A::begin() const {

S*n2007-09-12 07:09

6 楼

elements.begin()的类型是 void const;
iter的类型是map< , >::iterator;
你说该怎么改？我不知道。。heihei

【在 a*********r 的大作中提到】

: #include
: using namespace std;
: class A {
: public:
: void begin() const;
: private:
: map elements;
: map::iterator iter;
: };
: void A::begin() const {