Type Switch
Syntax {$X+} or {$X-}
{$EXTENDEDSYNTAX ON} or {$EXTENDEDSYNTAX OFF}
Default {$X+}
{$EXTENDEDSYNTAX ON}
Scope Global
Note: The $X directive is provided for backward compatibility. You
should not use the {$X-} mode when writing Delphi applications.
The $X directive enables or
disables Delphi's extended syntax:
· Function statements. In the {$X+} mode, function calls can be
used as procedure calls; that is, the result of a function call can be
discarded, rather than passed to another function or used in an operation or
assignment. Generally, the computations performed by a function are represented
through its result, so discarding the result makes little sense. Sometimes,
however, a function is called because it performs a task such as setting the
value of a global variable, without producing a useful result.
· The Result variable. In the {$X+} mode, the predefined
variable Result can be used within a function body to hold the function's
return value. For more information, see "Function
declarations" in the Object Pascal Language Guide
· Null-terminated strings. In the {$X+} mode, Pascal strings can be assigned to zero-based character arrays (array[0..X] of Char), which are compatible with PChar types. For more information, see "Working with null-terminated strings" in the Object Pascal Language Guide.