On 04/05/2021 22.29, Christopher Hallock via Std-Proposals wrote:

On Tue, May 4, 2021 at 1:49 PM Phil Endecott via Std-Proposals <std-proposals@lists.isocpp.org> wrote:
Avi Kivity wrote:
> On 04/05/2021 20.36, Phil Endecott via Std-Proposals wrote:
>> Yes, I'm aware of that. The rationale that I've seen does not
>> say much about a preference for variadic function syntax vs.
>> operator-overloading. There is mention of "chevron hell" in the
>> {fmt} library's github page. The introduction to the <format>
>> paper P0645R10 says "printf offers some advantages, such as an
>> arguably more natural function call API" (which I interpret as
>> meaning arguably more natural than chained operator overloading).
>> I'm curious as to what the committee thought - if anything -
>> about this aspect when <format> was being considered.
> Since they adopted the proposal, it appears they agree that the
> function-call syntax is more natural than chaining.

But C++20 also added the new chained operator| for ranges, so I don't
think it's clear what the preferred style is.

(Are there any other examples?)

That's different, though. Ranges API uses | for actual pipelining, e.g. f(g(h(x))) not f(a,b,c).

Also, there's a huge precedent in the form of shell pipes.