isAnyColorPalette

// a palette template
struct A(Ct, Dv) {
	Dv getDisplayValue(string behaviour)(Ct cellState) {
		return Ct.init;
	}

	Dv getDisplayValue(Ct cellState) { return getDisplayValue!""(cellState); }
}

bool a =       isAnyPalette!(A!(int, byte)); // true for any values of A
bool b = !isAnyColorPalette!(A!(int, int )); // false since A!(int, int ) does not return uint 
bool c = !isAnyColorPalette!(A!(int, uint)); // true  since A!(int, uint) does     return uint