Specifies an integer function type for IndyPos implementation.

TPosProc = function (const Substr, S: string): Integer;

String to be searched.

Substring to be located.

Integer - Position of the substring in the string, or zero when not found.

TPosProc is an Integer function type used to specify the implementation for the IndyPos function. TPosProc accepts two constant string arguments used as parameters for the IndyPos implementation.