[PATCH 3/4] libstdc++: avoid character accumulation in istreambuf_iterator

[Paolo Carlini]

Hi,

On 16/11/2017 06:31, Petr Ovtchenkov wrote:
> Is we really worry about frozen sizeof of instantiated template? 
Yes we do. See https://gcc.gnu.org/onlinedocs/libstdc++/manual/abi.html 
under "Prohibited Changes", point 8.

Of course removing the buffering has performance implications too - 
that's why it's there in the first place! - which I remember we 
investigated a bit again in the past when somebody reported that a few 
implementations had it other did not. But I can't say to have followed 
all the (recently uncovered) conformance implications, it could well be 
that we cannot be 100% conforming to the letter of the current standard 
while taking advantage of a buffering mechanism. Jonathan will provide 
feedback.

Paolo.