what's this template meaning in qglobal.h?

hi, When i read the qglobal.h, and i can't understander these template meaning. Can a template be specializition by a numeric ? And where is greneric version of QIntegerForSize?

thanks!

Code:

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template <int> struct QIntegerForSize;
template <>    struct QIntegerForSize<1> { typedef quint8  Unsigned; typedef qint8  Signed; };
template <>    struct QIntegerForSize<2> { typedef quint16 Unsigned; typedef qint16 Signed; };
template <>    struct QIntegerForSize<4> { typedef quint32 Unsigned; typedef qint32 Signed; };
template <>    struct QIntegerForSize<8> { typedef quint64 Unsigned; typedef qint64 Signed; };

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