Hi,

On 15/11/2017 11:48, Petr Ovtchenkov wrote:
Ask associated streambuf for character when needed instead of
accumulate it in istreambuf_iterator object.

Benefits from this:
   - minus one class member in istreambuf_iterator
   - trivial synchronization of states of istreambuf_iterator
     and associated streambuf
---
  libstdc++-v3/include/bits/streambuf_iterator.h | 34 ++++++++++++--------------
  1 file changed, 15 insertions(+), 19 deletions(-)

diff --git a/libstdc++-v3/include/bits/streambuf_iterator.h 
b/libstdc++-v3/include/bits/streambuf_iterator.h
index 08fb13b..203da9d 100644
--- a/libstdc++-v3/include/bits/streambuf_iterator.h
+++ b/libstdc++-v3/include/bits/streambuf_iterator.h
@@ -95,19 +95,18 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        // NB: This implementation assumes the "end of stream" value
        // is EOF, or -1.
        mutable streambuf_type* _M_sbuf;
-      mutable int_type         _M_c;
Obviously this would be an ABI-breaking change, which certainly we don't want. Unless I missed a detailed discussion of the non-trivial way to avoid it in one of the recent threads about these topics...

Paolo.

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