static if(!(is(T == GffByte)))
static if(!(is(T == GffChar)))
static if(!(is(T == GffWord)))
static if(!(is(T == GffShort)))
static if(!(is(T == GffDWord)))
static if(!(is(T == GffInt)))
static if(!(is(T == GffDWord64)))
static if(!(is(T == GffInt64)))
static if(!(is(T == GffFloat)))
static if(is(T == GffDouble))