Problem with std::ostream, std::streambuf and "virtual xsputn"

[Johannes Barop]

Hello,

i try to implement a streambuffer. I overwrote streambuf:verflow() and
streambuf::xsputn(). Both are protected and virtual
(http://www.cplusplus.com/ref/iostream/streambuf/).

But somehow my OutBuf::xsputn() is not beeing used. But the orginal
basic_streambuf::xsputn() calls my OutBuf:verflow().

http://pastebin.com/483016 - OutBuf.h
http://pastebin.com/483018 - OutBuf.cpp
http://pastebin.com/483022 - gdb - Output

Why basic_streambuf::xsputn() is called instead of OutBuf::xsputn() ?

 

[JH Trauntvein]

Hello,

i try to implement a streambuffer. I overwrote streambuf:verflow() and
streambuf::xsputn(). Both are protected and virtual
(http://www.cplusplus.com/ref/iostream/streambuf/).

But somehow my OutBuf::xsputn() is not beeing used. But the orginal
basic_streambuf::xsputn() calls my OutBuf:verflow().

http://pastebin.com/483016 - OutBuf.h
http://pastebin.com/483018 - OutBuf.cpp
http://pastebin.com/483022 - gdb - Output

Why basic_streambuf::xsputn() is called instead of OutBuf::xsputn() ?

Most likely, the reason is that the signature of your overloaded class'
m,ethod does not exactly match the signature of the base class' method.