pfe-cdecl-ext
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## Name

pfe-cdecl-ext ? C-preprocessor declaration syntax

## Synopsis

`#ELSE ( -- ) ?=>? (` | `)`; | ?

`"FORTH"`;
?

`#ENDIF ( -- ) ?=>? (` | `)`; | ?

`"FORTH"`;
?

`#IF ( -- C: state-save-flag mfth-if-magic S: ) ?=>? (` | `)`; | ?

`"FORTH"`;
?

`#IFDEF ( "word" -- ) ?=>? (` | `)`; | ?

`"FORTH"`;
?

`#IFNDEF ?=>? (` | `)`; | ?

`"FORTH"`;
?

`#IFNOTDEF ( "word" -- ) ?=>? (` | `)`; | ?

`"FORTH"`;
?

`#IS_TRUE ( C: state-save-flag mfth-if-magic S: test-flag -- ) ?=>? (` | `)`; | ?

`"FORTH"`;
?

`#IS_FALSE ( C: state-save-flag mfth-if-magic S: test-flag -- ) ?=>? (` | `)`; | ?

`"FORTH"`;
?

`#DEFINE ?=>? (` | `)`; | ?

`"FORTH"`;
?

`#PRAGMA ?=>? (` | `)`; | ?

`"FORTH"`;
?

## Description

#ELSE ( -- ) [FTH] => "FORTH"

The implementation of #ELSE is done in C for speed and being less error prone. Better use the ANSI-compatible `[IF]` `[ELSE]` `[THEN]` construct.

#ENDIF ( -- ) [FTH] => "FORTH"

end of `#IF` `#IFDEF` `#IFNOTDEF` and `#ELSE` contructs

        (a dummy word that does actually nothing, but #ELSE may look for it)

#IF ( -- C: state-save-flag mfth-if-magic S: ) [FTH] => "FORTH"

prepares for a following `#IS_TRUE` or `#IS_FALSE`, does basically switch off compile-mode for the enclosed code. better use the ANSI style `[IF]` `[ELSE]` `[THEN]` construct.

#IFDEF ( "word" -- ) [FTH] => "FORTH"

better use `[DEFINED] word [IF]` - the word `[IF]` is ANSI-conform.

#IFNDEF - no description, sorry

#IFNOTDEF ( "word" -- ) [FTH] => "FORTH"

better use `[DEFINED] word [NOT] [IF]` - the word `[IF]` and `[ELSE]` are ANSI-conform, while `#IFDEF` `#ELSE` are not.

#IS_TRUE ( C: state-save-flag mfth-if-magic S: test-flag -- ) [FTH] => "FORTH"

checks the condition on the `CS-STACK`. Pairs with `#IF` better use the ANSI style `[IF]` `[ELSE]` `[THEN]` construct.

#IS_FALSE ( C: state-save-flag mfth-if-magic S: test-flag -- ) [FTH] => "FORTH"

checks the condition on the `CS-STACK`. Pairs with `#IF` better use the ANSI style `[IF]` `[ELSE]` `[THEN]` construct.

#DEFINE - no description, sorry

#PRAGMA - no description, sorry

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