
if(+Goal)

   Conditional compilation directive.

Arguments
   Goal                Goal to be tested

Type
   Directives

Description

    The compiler and other source-processing tools recognise the conditional
    compilation directives if/1, elif/1, else/0 and endif/0. The first two
    take a goal as their argument, and parts of the program source can be
    included or excluded depending of the satisfiability of that goal.

    Note that these directives are the only ones that are not treated as
    predicate separators and can be placed around individual clauses of
    a predicate.
    

Modes and Determinism
   if(+) is det

Examples
   
    :- if(get_flag(hostarch,"i386_nt")).

	...Windows-specific code...

    :- elif( (get_flag(version_as_list,Version), Version @>= [6,0]) ).

	...code for version 6.0 and later...

    :- else.

	...alternative code...

    :- endif.
    

See Also
   elif / 1, else / 0, endif / 0, library(source_processor)
