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

On Thu, Dec 29, 2016 at 1:19 AM, Yakov Galka wrote:

On Tue, Dec 27, 2016 at 4:47 PM, Olaf van der Spek wrote:

...

One frequently needs to append stuff to strings, but the standard way (s += "A" + "B" + to_string(42)) isn't optimal due to temporaries.

Can't we already write it through (((s += "A") += "B") += to_string(42))? This is the time I think that assignment operators, other than =, should have had left associativitiy... pity they don't.

We can, but it's ugly and I'd like to avoid the explicit to_string. It also wouldn't allow the two-pass optimization to calculate the final length before allocation. -- Olaf