Package: libstdc++6 Version: 4.1.1-21 When compiling programs which use "/usr/include/c++/4.1.2/bits/streambuf_iterator.h" with gcc, and including the flag "-Wunreachable-code", the compiler informs me that the header file contains unreachable code. Now I know this is not an "error", but maybe one could optimize the code found in the header based on the compilers suggestions.
I am using: Linux 2.6.18-6-686 i686 GNU/Linux (Debian Etch) Sample code (taken from "http://www2.roguewave.com/support/docs/leif/sourcepro/html/stdlibref/istreambuf-iterator.html";): // // istreambuf_iterator.cpp // #include <iostream> // for cout, endl #include <fstream> // for ofstream, istreambuf_iterator #include <stdio.h> // for tmpnam () and remove () int main ( ) { // create a temporary filename const char *fname = tmpnam (0); if (!fname) return 1; // open the file is_iter.out for reading and writing std::ofstream out (fname, std::ios::out | std::ios::in | std::ios::trunc); // output the example sentence into the file out << "Ceci est un simple exemple pour démontrer le\n" "fonctionnement de istreambuf_iterator."; // seek to the beginning of the file out.seekp (0); // construct an istreambuf_iterator pointing to // the ofstream object underlying streambuffer std::istreambuf_iterator<char, std::char_traits<char> > iter (out.rdbuf ()); // construct an end of stream iterator const std::istreambuf_iterator<char, std::char_traits<char> > end; std::cout << std::endl; // output the content of the file while (!iter.equal (end)) { // use both operator++ and operator* std::cout << *iter++; } std::cout << std::endl; // remove temporary file remove (fname); return 0; } Sample compiling run: g++ -Wunreachable-code -o prog main.cpp /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/fstream: In constructor ‘std::basic_ofstream<_CharT, _Traits>::basic_ofstream(const char*, std::_Ios_Openmode) [with _CharT = char, _Traits = std::char_traits<char>]’: /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/fstream:573: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/fstream:573: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/fstream:573: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/fstream:573: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/fstream:575: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/fstream:576: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/basic_ios.h: In constructor ‘std::basic_ios<_CharT, _Traits>::basic_ios() [with _CharT = char, _Traits = std::char_traits<char>]’: /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/basic_ios.h:447: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/ostream: In constructor ‘std::basic_ostream<_CharT, _Traits>::basic_ostream() [with _CharT = char, _Traits = std::char_traits<char>]’: /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/ostream:341: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/ostream:341: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/ostream:341: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/ostream:341: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/ostream:341: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/ostream: In destructor ‘std::basic_ostream<_CharT, _Traits>::~basic_ostream() [with _CharT = char, _Traits = std::char_traits<char>]’: /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/ostream:113: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/ostream:113: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/ostream:113: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/streambuf_iterator.h: In constructor ‘std::istreambuf_iterator<_CharT, _Traits>::istreambuf_iterator(std::basic_streambuf<_CharT, _Traits>*) [with _CharT = char, _Traits = std::char_traits<char>]’: /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/streambuf_iterator.h:87: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/streambuf_iterator.h: In constructor ‘std::istreambuf_iterator<_CharT, _Traits>::istreambuf_iterator() [with _CharT = char, _Traits = std::char_traits<char>]’: /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/streambuf_iterator.h:79: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/fstream: In destructor ‘std::basic_ofstream<_CharT, _Traits>::~basic_ofstream() [with _CharT = char, _Traits = std::char_traits<char>]’: /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/fstream:586: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/fstream:586: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/fstream:586: warning: will never be executed /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/fstream:586: warning: will never be executed /tmp/ccqvH2F0.o: In function `main': main.cpp.text+0x8f): warning: the use of `tmpnam' is dangerous, better use `mkstemp' -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". 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