Re: Having friend templates in class templates
jehugaleahsa@gmail.com wrote:
I am trying to create a friend function template that can access the
members of an outer class template and an inner class template. My
class template looks something like this:
template <typename T>
struct Outer
{
// not sure how to define this function
template <typename U>
friend void doSomething(U const& value);
template <typename U>
struct Inner
{
static int num;
};
};
template <typename T>
template <typename U>
int Outer<T>::Inner<U>::num = 0;
// END example
I have been reading a template book but have not been able to resolve
my issue. Does someone know the syntax to define function doSomething?
I'm not sure if I've understood your problem but maybe
this will help;
// declare template function prototype
template <typename T>
void SomeFunction(void);
template <typename T>
class Outter
{
private:
friend void SomeFunction<T>(void);
int a;
T b;
template <typename U>
class Inner
{
private:
friend void SomeFunction<U>(void);
U a;
};
public:
};
template <typename T>
void SomeFunction(void)
{
// implement function here
// Will have access to all members of both Outter<T> and
// Outer<T>::Inner<float>
Outter<T>::Inner<float> ITmp;
Outter<T> OTmp;
ITmp.a = 3.4f;
OTmp.a = -7;
}
Well does it help?
JB
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