Initializing help system before first use

geteltype

Purpose
Get the type ID of an element of a collection type.
Synopsis
function geteltype(u: union): integer
function geteltype(tid: integer): integer
Arguments
u 
A union
tid 
A type ID
Return value
A type ID or -1 if the provided parameter is not a valid type ID or the union is not defined.
Example 
declarations
 MYSET=set of integer
 s: MYSET
 u1,u2,u3: any
end-declarations
  ...
u1:=s
u2:="bla"
writeln("ElType of MYSET: ", geteltype(MYSET.id),   ! = integer.id=1
        "\nElType of u1: ", u1.eltype,              ! = integer.id=1
        "\nElType of u2: ", u2.eltype,              ! = string.id=3
        "\nElType of u3: ", u3.eltype)              ! = -1
Further information
1. This function retrieves the type ID of an element of a collection (array, set or list) represented by a type ID or the value stored in a union. If the referenced type is not a collection ( i.e. it is a constant or a reference) the type of the entity itself will be returned (that is the same value as gettypeid).
2. There are 2 versions of this routine: when used with a union the information reported comes from the current value of this union ( -1 is returned if the union is not initialized). If applied to an integer the function expects this integer to be a type ID ( -1 is returned if this value does not correspond to a type ID).
Related topics
getstruct, gettypeid, geteltype.

Parent Topic Predefined functions and procedures

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