const
static if(!(Types.length == 0))
static if(Types.length == 1)
static if(!(IsType!(Unqual!(Types[0]), bool, byte, ubyte, short, ushort, int, uint, long, ulong, float, double, real, ifloat, idouble, ireal, cfloat, cdouble, creal, char, dchar, wchar)))
static if(is(Types[0] == struct))