VariantN.opApply
int opApply(Delegate)(scope Delegate dg) if (is(Delegate == delegate))If the VariantN contains an array, applies dg to each element of the array in turn. Otherwise, throws an exception.
int opApply(Delegate)(scope Delegate dg) if (is(Delegate == delegate))If the VariantN contains an array, applies dg to each element of the array in turn. Otherwise, throws an exception.