When used within an object, this directive defines a goal to be called after the object has been loaded into memory. When used at a global level within a source file, this directive defines a goal to be called after the compiled source file is loaded into memory.
Multiple initialization directives can be used in a source file or in an object. Their goals will be called in order at loading time.
Categories and protocols cannot contain initialization directives as the initialization goals would lack a complete execution context that is only available for objects.
Although technically a global
initialization/1 directive in a source
file is a Prolog directive, calls to Logtalk built-in predicates from it
are usually compiled to improve performance and providing better support
for embedded applications.
Some backend Prolog compilers declare
initialization as an operator
for a lighter syntax. But this makes the code non-portable and is
a practice best avoided.
Template and modes¶
% call the init/0 predicate after loading the % source file containing the directive: :- initialization(init).