Comma Operator - Left to Right Associativity

[Andreas Schwab]

On Feb 04 2021, David Brown wrote:

> For the built-in comma operator, you get guaranteed order of evaluation
> (or more precisely, guaranteed order of visible side-effects).  But for
> a user-defined comma operator, you do not - until C++17, which has
> guaranteed evaluation ordering in some circumstances.

But not the evaluation order of function arguments.  See
<https://en.cppreference.com/w/cpp/language/eval_order> Sequenced-before
rules, rule 15.

> Try your test again with "-std=c++17" or "-std=g++17" - if the order is
> still reversed, it's a gcc bug (AFAICS).

I don't think so.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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