compile error about member variable initialization

[George2]

Hello everyone,
Why the below code segment will result in compile error? When I change
code to the comment one (constructor), it can compile. The compiler is
too stupid? :-)

I am using Visual Studio 2005.

--------------------
main.cpp(13) : error C2758: 'Foo::vi' : must be initialized in
constructor base/member initializer list

see declaration of 'Foo::vi'
--------------------

#include <vector>
 
using namespace std;
 
class Foo {
 
private:
 
vector<int>& vi;
 
public:
 
Foo (vector<int>& vi_in)
{
vi = vi_in;
}
/*
Foo (vector<int>& vi_in) : vi (vi_in)
{
}
*/
};
 
int main()
{
vector<intvi;
Foo foo = Foo (vi);
 
 
return 0;
}
 

thanks in advance,
George

[Victor Bazarov]

George2 wrote:

Why the below code segment will result in compile error? When I change
code to the comment one (constructor), it can compile. The compiler is
too stupid? :-)

I am using Visual Studio 2005.

--------------------
main.cpp(13) : error C2758: 'Foo::vi' : must be initialized in
constructor base/member initializer list
[..]

No, the compiler is not too stupid. References have to be initialised.
The only place where reference members can be initialised is the c-tor
initialiser list.

V
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