Compiler Directives

This section describes each of the DataFlex compiler directives. They are listed alphabetically. Compiler directives are used to control the features of the DataFlex compiler. The compiler directives can perform such tasks as conditional compilation, switch compiler options, create new command macros, and so on.

Current compiler directives include:

Directive	Description
#Check	Checks the validity of an identifier against a list of type-checking characters.
#ChkSub	Verifies that the version# is the same as the compiler's own version for the specified subsystem.
#Command	Allows you to define a new commands using sequences of existing DataFlex commands.
#Compat	Sets the compile-time revision integer !@.
#Data	Prepares the compiler to accept the arguments of an object declaration.
#DPush	Pushes a symbol onto the data compile-time stack.
#EntOpt	Evaluates the options of the last previous entry_item statement.
#EndHeader	Terminates a precompiled program-header section.
#EndIf	Specifies conditionally compiled code based on some expression that is evaluated at compile-time.
#Error	Declares a compile time error.
#FRef	Instructs the compiler how to resolve a, so far, undefined symbol.
#FReg	Registers a function and its arguments to the compiler.
#Header	Saves time in program development and recompilation by designating the initial portion of a program's source code for precompilation.
#Include	Incorporates into a program at compile time, program source code from another source-code file.
#If	Specifies conditionally compiled code based on some expression that is evaluated at compile-time.
#IfDef	Specifies conditionally compiled code based on whether a symbol has been typed (or defined).
#IfNDef	Specifies conditionally compiled code based on whether a symbol has not been typed (or defined).
#IfClass	Specifies conditionally compiled code based the class of a symbol.
#IfSame	Specifies conditionally compiled code based on the comparison of a symbol to one or more literal values at compile-time.
#IfSub	Specifies conditionally compiled code based on whether a symbol is substitutable or not.
#IfType	Specifies conditionally compiled code based the type of a symbol.
#If2Type	Works in the same way as the #IfType command except that two symbols are tested together instead of just one.
#Noisy	Specifies the compiler verbosity level.
#Num	Sets space aside in the static data area for a Number or Date runtime variable. Reserves 12 bytes per variable.
#Pop	Pops a value off the primary compile-time stack.
#Push	Pushes a compile-time variable onto the primary compile-time stack.
#Real	Sets space aside in the static data area for a Real runtime variable. Reserves 8 bytes per variable.
#Set	Assigns a value to an Integer compile-time variable.
#SPop	Pops a value off the string compile-time stack.
#SPush	Pushes a value onto the string compile-time stack.
#StkSym	Destroys all stack type symbols, \|S?.
#Str	Sets space aside in the static data area for a String runtime variable.
#Warning	Causes compiler to output a warning.
!@ - Revision Variable	Stamps the compiled program file with the DataFlex revision number under which it was compiled.
!$ - String Variable	Holds any character string needed by the programmer during the compilation process.