Avoids std::distance calls

[Jonathan Wakely]

On 04/06/18 22:13 +0200, François Dumont wrote:
>Hi
>
>I'd like to propose this patch to avoid std::distance calls. In a 
>number of situation in algos we already have the size of the buffer we 
>need so we shouldn't have to compute it again.

Just one place, in __inplace_merge, no?

>I don't think there is any abi concern for this inline constructor, 
>isn't there ?

No concerns, users can't explicitly instantiate that type, and it will
be inlined or generate an instantiation everywhere it's used.

>Â Â Â  * include/bits/stl_tempbuf.h
>Â Â Â  (_Temporary_buffer(_FwdIte, _FwdIte)): Delete, replaced by...
>Â Â Â  (_Temporary_buffer(_FwdIte, size_type)): ...this, new.
>Â Â Â  * include/ext/memory (temporary_buffer<>(_FwdIte, _FwdIte)): Adapt.
>Â Â Â  * include/bits/stl_algo.h (__stable_partition): Adapt.
>Â Â Â  (__inplace_merge): Adapt.
>Â Â Â  (__stable_sort): Adapt.
>
>Tested under Linux x86_64 normal mode.
>
>Ok to commit ?

OK, thanks.