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Subject: Experiment with variadic templates
Date: Fri, 6 Jun 2008 16:34:51 -0600
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Thread-Topic: Experiment with variadic templates
Thread-Index: AcjIJYsWZb3AytBMRI69qWJVshp2dw==
From: "Eric Lemings" <Eric.Lemings@roguewave.com>
To: <dev@stdcxx.apache.org>
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=20
Consider the following little program:

------------------------------------------------------------------------

template <class IntType, IntType IntVal>
struct integer {
    typedef IntType value_type;
    static const value_type value =3D IntVal;
};
=20
template <class... TypesT>
struct tuple
{
    tuple ();
    tuple (const tuple&);
    tuple& operator=3D (const tuple&);
=20
};
=20
#include <cstddef>
=20
template <class... TypesT>
struct tuple_size
    : integer<std::size_t, sizeof... (TypesT)> { };
=20
#include <iostream>
=20
int main ()
{
    typedef tuple < > tuple0;
    std::cout << tuple_size< tuple0 >::value << std::endl;
=20
    typedef tuple < int > tuple1;
    std::cout << tuple_size< tuple1 >::value << std::endl;
=20
    return 0;
}

------------------------------------------------------------------------

Compiling with gcc-4.3 using the -std=3Dgnu++0x option (gcc-4.3.1 was
just released BTW), I get the following output:

1
1

The first line should print '0', shouldn't it?  Or no?

Brad.