Function channelValid

src/IECoreImageBindings/ImagePrimitiveBinding.cpp:112–122

\todo Rewrite the Parameter::valueValid bindings to follow this form? They currently always return a tuple, which is causing lots of coding errors (the tuple is always true, and it's easy to forget a tuple is being returned and expect a bool instead).

/// return a tuple, which is causing lots of coding errors (the tuple is always true, and it's
/// easy to forget a tuple is being returned and expect a bool instead).
static object channelValid( ImagePrimitive &that, Data &d, bool wantReason = false )
{
	if( wantReason )
	{
		std::string reason;
		bool v = that.channelValid( &d, &reason );
		return boost::python::make_tuple( v, reason );
	}
	bool v = that.channelValid( &d );
	return object( v );
}

static object channelValid2( ImagePrimitive &that, const char *n, bool wantReason = false )
{