5.1.13 defined

Syntax:

defined ( name )

Type:

int

Purpose:

returns a value <>0 (TRUE) if there is a user-defined object with this name, and 0 (FALSE) otherwise.
A non-zero return value is the level where the object is defined (level 1 denotes the top level, level 2 the level of a first procedure, level 3 the level of a procedure called by a first procedure, etc.). For ring variables, -1 is returned.

Note:

A local object m may be identified by if (defined(m)==voice).

Example:

ring r=(0,t),(x,y),dp; matrix m[5][6]=x,y,1,2,0,x+y; defined(mm); → 0 defined(r) and defined(m); → 1 defined(m)==voice; // m is defined in the current level → 1 defined(x); → -1 defined(z); → 0 defined(t); → -1 defined(42); → -1

See rvar; voice.