CV template - 未名空间MITBBS历史存档

国际科技财经博客移民网络热点娱乐民生时事公众号

Redian新闻

>未名空间

>Immigration - 落地生根

CV template

CV template# Immigration - 落地生根

C*y2011-10-13 07:10

1 楼

Got error C2664: 'foo' : cannot convert parameter 1 from 'B *' to 'A *&'
How can I handle it? Thanks!
class A
{
};
class B: public A
{
};
void foo( A*& a )
{
}
void bar( B*& b )
{
foo(b);
}
int main()
{
B* b = NULL;
bar( b);
return 0;
}

s*s2011-10-13 07:10

2 楼

有没有哪位牛人愿意提供CV模板啊,一般多少页为好，是不是也不能太长。。？

C*y2011-10-13 07:10

3 楼

I can't change the type of argument

c*g2011-10-13 07:10

4 楼

ft
cv也要模板啊

【在 s**********s 的大作中提到】

: 有没有哪位牛人愿意提供CV模板啊,一般多少页为好，是不是也不能太长。。？

r*t2011-10-13 07:10

5 楼

can you change the function body of foo/bar? ptr is not class obj, having no
polymorphism.

【在 C***y 的大作中提到】

: I can't change the type of argument

f*n2011-10-13 07:10

6 楼

You can't. B*& is not compatible with A*&, similar to how B** is not
compatible with A**. If you could, you could do terrible things in foo()
like assign an A* to the variable that's supposed to be B*.
Maybe if you made a reference to const it would be okay, but I'm not sure about this (don't remember exactly).

b*i2011-10-13 07:10

7 楼

改成
class A{
public:
int a;
A():a(0){};
};
class B: public A{
};
void foo( A*& a ){
a->a=1;
}
void bar( B*& b ){
foo((A*&)b);
}
int main(){
B* b = new B();
bar( b);
cout<a);
return 0;
}

【在 C***y 的大作中提到】

: Got error C2664: 'foo' : cannot convert parameter 1 from 'B *' to 'A *&'
: How can I handle it? Thanks!
: class A
: {
: };
: class B: public A
: {
: };
: void foo( A*& a )
: {