Re: Can you please verify that the analysis of these C functions is correct?

On 23/06/2024 08:52, Bonita Montero wrote:

Am 22.06.2024 um 20:50 schrieb Richard Damon:
 

Prior to that, it was allowed to compute the order of the terms being output in any order, as the call to operator <<(ostream& strm, T& value) was allowd to compute value before resolving stream (as the value from the previous operator <<, which caught enough people off guard.

 With a left-associative operator the result of the left part has to be
calculated before it can be used with the right part.

Both the left part and the right part need to be evaluated before the operator between them can be evaluated - but the two parts can be evaluated in either order (or even interleaved in their evaluation). Associativity is irrelevant.
Before C++17 (which added the rules for sequencing for shifts, and made a few other changes), if you had:
foo() << bar()
then the compiler could evaluate bar() then foo(), or foo() then bar(). It can still happily arrange them as it wants for "foo() + bar()".
<https://en.cppreference.com/w/cpp/language/eval_order>