executable_expression — Execute a stand-alone operation.
executable_expression( : : Expression : )
The HDevelop language contains a few operations that are executed stand-alone, i.e., not as an expression within another operator call. The operator executable_expression allows to enter such stand-alone operations into the operator window of HDevelop. In the full text editor however, those operations are entered verbatim.
Currently, the following modifying vector operations are stand-alone and can only be used in an executable expression:
For further details about these operations please refer to the HDevelop User's Guide.
Even though Expression formally is presented as a control parameter, nonetheless it is also possible to execute stand-alone operations with iconic vectors.
Operation to be executed.
read_image (Image1, 'fin1') read_image (Image2, 'fin2') ImageVector.insert(1, Image1).insert(2, Image2) * process vector ImageVector.clear()
If the values of the specified parameters are correct, executable_expression returns 2 (H_MSG_TRUE). Otherwise an exception is raised and an error code returned.