Re: [boost] Variadic append for std::string

Subject: Re: [boost] Variadic append for std::string
From: Damien Buhl (damien.buhl_at_[hidden])
Date: 2017-01-15 15:42:03

On 15/01/2017 14:39, Christof Donat wrote:
> We were talking about performance here. Therefore I tried to come up
> with a syntax, that can be implemented without virtual function calls
> as much as possible and avoids parsing format strings. Also that
> syntax should allow for creating the result in one go, in order to
> avoid unnecessary reallocations. Keeping that in mind, I think, my
> proposal is not the worst possible, though, of course, someone might
> come up with a better one.
>
Yes sorry I've been distracted by the discussion about formatting,
because indeed your API idea looks like a good choice when it come to
the initial problem of this discussion : appending / concatenating.
While users might find more intuitive a variadic concat(...) api.

But to close the ellipsis about formatting : with something like Abel
Sincovick's snprintf in principle you only pay for the parsing at
compile-time and at runtime you have your string formatted with no/less
dynamic allocation.

> Libraries like boost::format have their strengths, when simply
> concatenating information does not fit the needs. E.g. for
> internationalized text output. I like boost::format a lot, but speed
> actually is not its focus.
I personally uses boost::format alot, but I think boost::format would be
easier and shorter to use if it would be callable with an `std::string
snprintf(format_str, args...)`. And it would be awesome that format_str
would be, if already known at compile time handled with Metaparse.
Sorry for getting off-topic. :D

--
Damien Buhl