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Static versus dynamic calls – PB Docs 150 – PowerBuilder Library

Static versus dynamic calls – PB Docs 150

  2. Powerbuilder Documentation
  3. Powerbuilder Documentation Older
  4. Powerbuilder Documentation 15.0
  5. Static versus dynamic calls – PB Docs 150

Static versus dynamic calls

Calling functions and events

PowerBuilder calls functions and events in three ways, depending
on the type of function or event and the lookup method defined.

Table 6-2: How PowerBuilder calls functions and events

Type of function

Compiler typing

Comments

Global and system functions

Strongly typed. The function must exist
when the script is compiled.

These functions must exist and are called
directly. They are not polymorphic, and no substitution is ever
made at execution time.

Object functions with STATIC lookup

Strongly typed. The function must exist
when the script is compiled.

The functions are polymorphic. They must
exist when you compile, but if another class is instantiated at
execution time, its function is called instead.

Object functions with DYNAMIC lookup

Weakly typed. The function does not have
to exist when the script is compiled.

The functions are polymorphic. The actual
function called is determined at execution time.

Specifying static or dynamic lookup

For object functions and events, you can choose when PowerBuilder
looks for them by specifying static or dynamic lookup. You specify
static or dynamic lookup using the STATIC or DYNAMIC keywords.
The DYNAMIC keyword applies only to functions
that are associated with an object. You cannot call global or system
functions dynamically.

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August 19, 2023
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