Re: reference type as template argument

"Alf P. Steinbach" <>
Wed, 14 May 2008 18:36:03 +0200
*, India:

template<typename T> Test
// ...

We can have a pointer type as argument to a template class. For
example, we can have,
int x = 100;
Test<int*> obj(&x); // assuming a suitable ctor exists

But we cannot have reference type as template argument. This is
because reference cannot be assigned (in the overloaded assignment
operator) in the ordinary sense - that is, a reference cannot be
reseated. So, we cannot instantiate a template class with reference
type as argument. Is this understanding of mine, is correct ?

#include <iostream>
#include <ostream>

template< typename T >
struct X
     T v;
     X( T v_ ): v(v_) {}

int main()
     int y = 41;
     X<int&> r( y );
     r.v = 42;
     std::cout << y << std::endl;

Cheerio, & hth.,

- Alf

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