How to define a type of reference to procedure

[mihaisheng]

{$mode objfpc}{$H+}
{$modeswitch anonymousfunctions}
 
type
  TMyProc = reference to procedure;

may be lazarus4.6 cant recognize this symbol.

unittry.pas(4,2) Warning: Illegal compiler switch "ANONYMOUSFUNCTIONS+"
unittry.pas(13,12) Error: Identifier not found "reference"
unittry.pas(13,22) Error: Error in type definition
unittry.pas(13,22) Error: Syntax error, ";" expected but "TO" found

[Fibonacci]

Anonymous Functions and Function References were introduced around 2022, but you won't find them in any released FPC The most recent FPC release is, AFAIK, 3.2.2 from 2021.

You need to build the trunk version yourself.

Also, for "reference" to work you need one more modeswitch:

Code: Pascal  [Select][+][-]

1. {$modeswitch anonymousfunctions}
2. {$modeswitch functionreferences}

[mihaisheng]

Lazarus:4.6,FPC:3.2.2

{$mode objfpc}{$H+}
{$modeswitch anonymousfunctions}
{$modeswitch functionreferences}

unittry.pas(4,2) Warning: Illegal compiler switch "ANONYMOUSFUNCTIONS+"
unittry.pas(5,2) Warning: Illegal compiler switch "FUNCTIONREFERENCES+"
unittry.pas(13,12) Error: Identifier not found "reference"
unittry.pas(13,22) Error: Error in type definition
unittry.pas(13,22) Error: Syntax error, ";" expected but "TO" found
Codetools,error: 1
unittry.pas(13,12) Error: not found:reference

error still alive.

such as: try.except.finally, AI tell me this way was always supported in FPC3.2.2,but im still use the way of  try.try.except.end.finally.end.

welcome.

[Fibonacci]

3.2.2 doesn't have it - no official release has these features yet. You have to build FPC yourself, from source.

Easiest way is fpcupdeluxe: https://github.com/LongDirtyAnimAlf/fpcupdeluxe/releases

[mas steindorff]

Code: Pascal  [Select][+][-]

1. type
2.   TMyProc = procedure of object;
3.  

is what I've used for years but I do not know if that is what you are looking for.
 
Mas

[PascalDragon]

such as: try.except.finally, AI tell me this way was always supported in FPC3.2.2,but im still use the way of  try.try.except.end.finally.end.

Believe us, not some AI. Anonymous functions and function references are only available in 3.3.1 and a shorthand combination for try … finally and try … except does not exist at all.

Also please use [code][/code]-tags for better readability.