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[PATCH 4/4] libstdc++: immutable _M_sbuf in istreambuf_iterator

No needs to have mutable _M_sbuf in istreambuf_iterator
more.
---
 libstdc++-v3/include/bits/streambuf_iterator.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/bits/streambuf_iterator.h b/libstdc++-v3/include/bits/streambuf_iterator.h
index 203da9d..e2b6707 100644
--- a/libstdc++-v3/include/bits/streambuf_iterator.h
+++ b/libstdc++-v3/include/bits/streambuf_iterator.h
@@ -94,7 +94,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       // the "end of stream" iterator value.
       // NB: This implementation assumes the "end of stream" value
       // is EOF, or -1.
-      mutable streambuf_type*	_M_sbuf;
+      streambuf_type* _M_sbuf;
 
     public:
       class proxy
-- 
2.10.1
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