Optimization for std::to_string()

[Jonathan Wakely]

On 20/07/18 13:51 +0300, niXman wrote:
>Jonathan Wakely 2018-07-20 13:05:
>>On 20/07/18 12:44 +0300, niXman wrote:
>
>>Thanks. How did you verify it's an optimization?
>Optimization is that there is no superfluous copying into string.
>
>>The to_string functions always pass at least __n=16 to __to_xstring,
>>which is larger than the SSO buffer in std::__cxx11::string, and so
>>forces a memory allocation.
>I didn't think about this...

Avoiding an unconditional dynamic allocation is the main advantage of
using alloca.