28. defer and defer_delete macros¶
Apply module implements defer and defer_delete pattern, i.e. ability to attach a bit of code or a delete operation to a finally section of the block, without leaving the context of the code.
All functions and symbols are in “defer” module, use require to get access to it.
require daslib/defer
28.1. Function annotations¶
-
DeferMacro¶
This macro covnerts defer() <| block expression into {}, and move block to the finally section of the current block
28.2. Call macros¶
-
defer_delete¶
This macro converts defer_delete() expression into {}, and add delete expression to the finally section of the current block
28.3. Defer¶
-
defer(blk: block<void> const)
argument |
argument type |
|---|---|
blk |
block<> const |
defer a block of code. For example:
var a = fopen("filename.txt","r")
defer <|
fclose(a)
Will close the file when ‘a’ is out of scope.