Data type of function environments
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DOM_FUNC_ENV is the data type of function
MuPAD® uses function environments (domain type
to integrate functions into the system. All MuPAD library functions
and most kernel functions are implemented as function environments.
A function environment stores special function attributes (slots)
in an internal table. When an overloadable system function, such as
float, encounters an
object of type
DOM_FUNC_ENV, it searches the function
environment for a corresponding slot.
A function environment consists of three operands. The first operand is a procedure that computes the return value of a function call. The second operand is a procedure for printing a symbolic function call on the screen. The third operand is a table that specifies how the system functions handle symbolic function calls.