These functions are part of the OpenMaple interface to Microsoft Visual Basic.

The IsMaple* functions test the specified type of the given Maple object. These functions all return TRUE (1) when the Maple DAG, s, fits the description given by the function name. If s is not of the correct type, FALSE (0) is returned.

MapleNumArgs returns the length of any Maple object.  It is most useful for computing the number of arguments in an expression sequence object.

Several functions can determine what kind of NULL an object is. These are primarily used by automatic C wrapper generation, but are not commonly seen in custom code.   They have been translated from the C API to VB for the sake of completeness.

IsMapleUnnamedZero looks for a Maple zero object, but not a name assigned the value zero.

IsMapleNULL tests for the empty expression sequence denoted by NULL in the Maple language.

IsPointerNULL tests for the C version of NULL (hardware zero), or the Maple string, "NULL".

IsMapleStop can be used to detect the evaluation of the quit command.

The IsMaple...Numeric routines use the Maple type numeric definition. All other tests use the object type definition as defined by the type command. The only significant exception is IsMapleName, which returns TRUE only for NAME objects, while type(t[1], name) returns true even if it is testing a TABLEREF object.

Integer query routines, with the bit size specified in the name, test to ensure that the given Maple object, s, is a Maple integer and also that it can fit into the specified number of bits if converted to a hardware integer.