[fpc-devel] Evaluation order in expressions

[Jonas Maebe]

On 2019-07-30 08:23, Ondrej Pokorny wrote:

> can somebody comment on the Remark from 
> https://www.freepascal.org/docs-html/ref/refch12.html ?
> _Remark: The order in which expressions of the same precedence are 
> evaluated is not guaranteed to be left-to-right._
> 
> Is this valid for boolean expressions, too?

Only if short circuit boolean evaluation is off.

> (Well it is no surprise because 
> https://www.freepascal.org/docs-html/ref/refch12.html states that 
> "_This behaviour is distinctly different from Delphi or Turbo 
> Pascal._")

Delphi evaluates e.g. all parameters to subroutine calls from left to 
right, which FPC does not guarantee.


Jonas