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<int> vi;
	Foo foo = Foo (vi);


	return 0;
}

thanks in advance,
George

 

[Victor Bazarov]

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.

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