ho ritrovato l'esempio , shodan pero ' è cosi :

.inl
codice:
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
Tuple<DIMENSION,TYPE>::Tuple ()
{
    // Uninitialized for native data.  Initialized for class data as long as
    // TYPE's default constructor initializes its own data.
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
Tuple<DIMENSION,TYPE>::Tuple (const Tuple& tuple)
{
    for (int i = 0; i < DIMENSION; ++i)
    {
        mTuple[i] = tuple.mTuple[i];
    }
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
Tuple<DIMENSION,TYPE>::~Tuple ()
{
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
inline Tuple<DIMENSION,TYPE>::operator const TYPE* () const
{
    return mTuple;
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
inline Tuple<DIMENSION,TYPE>::operator TYPE* ()
{
    return mTuple;
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
inline TYPE Tuple<DIMENSION,TYPE>::operator[] (int i) const
{
    return mTuple[i];
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
inline TYPE& Tuple<DIMENSION,TYPE>::operator[] (int i)
{
    return mTuple[i];
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
Tuple<DIMENSION,TYPE>& Tuple<DIMENSION,TYPE>::operator= (const Tuple& tuple)
{
    for (int i = 0; i < DIMENSION; ++i)
    {
        mTuple[i] = tuple.mTuple[i];
    }
    return *this;
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
bool Tuple<DIMENSION,TYPE>::operator== (const Tuple& tuple) const
{
    return memcmp(mTuple, tuple.mTuple, DIMENSION*sizeof(TYPE)) == 0;
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
bool Tuple<DIMENSION,TYPE>::operator!= (const Tuple& tuple) const
{
    return memcmp(mTuple, tuple.mTuple, DIMENSION*sizeof(TYPE)) != 0;
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
bool Tuple<DIMENSION,TYPE>::operator< (const Tuple& tuple) const
{
    return memcmp(mTuple, tuple.mTuple, DIMENSION*sizeof(TYPE)) < 0;
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
bool Tuple<DIMENSION,TYPE>::operator<= (const Tuple& tuple) const
{
    return memcmp(mTuple, tuple.mTuple, DIMENSION*sizeof(TYPE)) <= 0;
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
bool Tuple<DIMENSION,TYPE>::operator> (const Tuple& tuple) const
{
    return memcmp(mTuple, tuple.mTuple, DIMENSION*sizeof(TYPE)) > 0;
}
//----------------------------------------------------------------------------
template <int DIMENSION, typename TYPE>
bool Tuple<DIMENSION,TYPE>::operator>= (const Tuple& tuple) const
{
    return memcmp(mTuple, tuple.mTuple, DIMENSION*sizeof(TYPE)) >= 0;
}
//----------------------------------------------------------------------------

.h

codice:
// Geometric Tools, LLC
// Copyright (c) 1998-2010
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/Licens...ICENSE_1_0.txt
//
// File Version: 5.0.1 (2010/04/14)

#ifndef WM5TUPLE_H
#define WM5TUPLE_H

#include "Wm5CoreLIB.h"

// The class TYPE is either native data or is class data that has the
// following member functions:
//   TYPE::TYPE ()
//   TYPE::TYPE (const TYPE&);
//   TYPE& TYPE::operator= (const TYPE&)

namespace Wm5
{

template <int DIMENSION, typename TYPE>
class Tuple
{
public:
    // Construction and destruction.  The default constructor does not
    // initialize the tuple elements for native elements.  The tuple elements
    // are initialized for class data whenever TYPE initializes during its
    // default construction.
    Tuple ();
    Tuple (const Tuple& tuple);
    ~Tuple ();

    // Coordinate access.
    inline operator const TYPE* () const;
    inline operator TYPE* ();
    inline TYPE operator[] (int i) const;
    inline TYPE& operator[] (int i);

    // Assignment.
    Tuple& operator= (const Tuple& tuple);

    // Comparison.  The inequalities make the comparisons using memcmp, thus
    // treating the tuple as an array of unsigned bytes.
    bool operator== (const Tuple& tuple) const;
    bool operator!= (const Tuple& tuple) const;
    bool operator<  (const Tuple& tuple) const;
    bool operator<= (const Tuple& tuple) const;
    bool operator>  (const Tuple& tuple) const;
    bool operator>= (const Tuple& tuple) const;

protected:
    TYPE mTuple[DIMENSION];
};

#include "Wm5Tuple.inl"

}

#endif

come funziona questo esempio?
il problema è che ci sono vari modi da quel che ho capito e ne dovro scegliere uno solo per programmare con i template.
Perchè l'inline è sempre presente coi template?
Mitaly mi ha spiegato a grandi linee cosa fa , ma sono un po incerto.
Sono alle prime armi con i template.