Scilab Function
Last update : Nov 1999

intppty - set interface argument passing properties

### Calling Sequence

  `funs=intppty()`
  `intppty(fun)`

### Parameters

- `fun`: integer an interface number (see funptr)
- `funs`: integer vector, vector of interface number (see funptr)

### Description

The interface programs may be written in 2 different ways for the mode of function argument passing.

In the first and default way, the arguments are passed by value. With the following syntax:

    foo(A,1+2)

the argument associated with `A` will be passed by value (a copy of `A` is made before `foo` is called, and the argument associated with `1+2` will be passed by value.

In the second way arguments may be passed be reference if there are "named arguments" (no copy of the variable value is done). `intppty(fun)` with `fun>0` tells Scilab that the interface with number `fun` can handle arguments passed by reference. With the following syntax:

    foo(A,1+2)

the argument associated with `A` will be passed by reference, and the argument associated with `1+2` will be passed by value.

Warning, declaring that the interface with number `fun` can handle arguments passed by reference if it is not the case should produce unpredictable results.

`intppty(fun)` with `fun<0` suppress this property for the interface `-fun`.

`intppty()` returns the vector of interfaces which handle arguments passed by reference.

This function may be useful for dynamically loaded interface (see addinter).

### See Also

`funptr`, `addinter`,