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Return the class-type of a specified type
 
Int_Type __class_type (DataType_Type type)) 
Internally S-Lang objects are classified according to four types:
scalar, vector, pointer, and memory managed types.  For example, an
integer is implemented as a scalar, a complex number as a vector,
and a string is represented as a pointer.  The __class_type
function returns an integer representing the class-type associated
with the specified data type. Specifically, it returns:
 
       0    memory-managed
       1    scalar
       2    vector
       3    pointer
 
slangrtl
__class_id,
__eqs,
__get_reference,
__is_initialized,
__pop_args,
__push_args,
_nargs,
_typeof,
array_info,
dup,
is_defined,
is_struct_type,
length,
typecast,
typeof
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