Created attachment 27599 [details] The program The move assignment operator should be provided for ifstream. The following program fails to compile. It should print out the contents of a text file, whose first line starts with "My File". #include <iostream> #include <string> #include <fstream> std::ifstream OpenMyFile(const std::string& filename) { std::ifstream file(filename); if (!file.good()) { file.close(); return file; } std::string s; std::getline(file, s); if (s.substr(0,7) != "My File") { file.close(); file.setstate(std::ios_base::failbit); return file; } return file; } int main(int count, char *args[]) { if (count < 2) { std::cout << "Incorrect number of parameters" << std::endl; return -1; } std::ifstream myFile = OpenMyFile(args[1]); if (myFile.good()) { while (!myFile.eof()) { std::string s; std::getline(myFile,s); std::cout << s << std::endl; } } else { std::cout << "*** FILE ERROR ***" << std::endl; } return 0; }
Yep, this is documented as missing: http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2011
*** Bug 57677 has been marked as a duplicate of this bug. ***
Author: redi Date: Mon Sep 22 13:34:09 2014 New Revision: 215463 URL: https://gcc.gnu.org/viewcvs?rev=215463&root=gcc&view=rev Log: Make streams movable and swappable. PR libstdc++/54316 PR libstdc++/53626 * config/abi/pre/gnu.ver: Add new exports. * config/io/basic_file_stdio.h (__basic_file): Support moving and swapping. * include/bits/basic_ios.h (basic_ios::move, basic_ios::swap): Likewise. * include/bits/ios_base.h (ios_base::_M_move, ios_base::_M_swap): Likewise. * include/bits/fstream.tcc (basic_filebuf): Likewise. * include/bits/move.h (__exchange): Define for C++11 mode. * include/ext/stdio_filebuf.h (stdio_filebuf): Support moving and swapping. * include/ext/stdio_sync_filebuf.h (stdio_sync_filebuf): Likewise. * include/std/fstream (basic_filebuf, basic_ifstream, basic_ofstream, basic_fstream): Likewise. * include/std/ios: Remove whitespace. * include/std/istream (basic_istream, basic_iostream): Support moving and swapping. * include/std/ostream (basic_ostream): Likewise. * include/std/sstream (basic_stringbuf, basic_istringstream, basic_ostringstream, basic_stringstream): Likewise. * include/std/streambuf (basic_streambuf): Do not default copy constructor and assignment on first declaration. * include/std/utility (exchange): Forward to __exchange. * testsuite/27_io/basic_filebuf/cons/char/copy_neg.cc: New. * src/c++11/Makefile.am: Add stream-related files. * src/c++11/Makefile.in: Regenerate. * src/c++11/ext11-inst.cc (stdio_filebuf, stdio_sync_filebuf): New file for explicit instantiation definitions. * src/c++11/ios.cc: Move from src/c++98 to here. (ios_base::_M_move, ios_base::_M_swap): Define. * src/c++11/ios-inst.cc: Move from src/c++98 to here. * src/c++11/iostream-inst.cc: Likewise. * src/c++11/istream-inst.cc: Likewise. * src/c++11/ostream-inst.cc: Likewise. * src/c++11/sstream-inst.cc: Likewise. * src/c++11/streambuf-inst.cc: Likewise. * src/c++98/Makefile.am: Remove stream-related files. * src/c++98/Makefile.in: Regenerate. * src/c++98/ext-inst.cc (stdio_filebuf): Remove explicit instantiations. * src/c++98/misc-inst.cc (stdio_sync_filebuf): Likewise. * src/c++98/ios-inst.cc: Move to src/c++11/. * src/c++98/ios.cc: Move to src/c++11/. * src/c++98/iostream-inst.cc: Likewise. * src/c++98/istream-inst.cc: Likewise. * src/c++98/ostream-inst.cc: Likewise. * src/c++98/sstream-inst.cc: Likewise. * src/c++98/streambuf-inst.cc: Likewise. * testsuite/27_io/basic_filebuf/cons/char/copy_neg.cc: New. * testsuite/27_io/basic_fstream/cons/move.cc: New. * testsuite/27_io/basic_fstream/assign/1.cc: New. * testsuite/27_io/basic_ifstream/cons/move.cc: New. * testsuite/27_io/basic_ifstream/assign/1.cc: New. * testsuite/27_io/basic_istringstream/assign/1.cc: New. * testsuite/27_io/basic_istringstream/cons/move.cc: New. * testsuite/27_io/basic_ofstream/cons/move.cc: New. * testsuite/27_io/basic_ofstream/assign/1.cc: New. * testsuite/27_io/basic_ostringstream/assign/1.cc: New. * testsuite/27_io/basic_ostringstream/cons/move.cc: New. * testsuite/27_io/basic_stringstream/assign/1.cc: New. * testsuite/27_io/basic_stringstream/cons/move.cc: New. Added: trunk/libstdc++-v3/src/c++11/ext11-inst.cc - copied, changed from r215458, trunk/libstdc++-v3/src/c++98/ios-inst.cc trunk/libstdc++-v3/src/c++11/ios-inst.cc - copied, changed from r215458, trunk/libstdc++-v3/src/c++98/ios-inst.cc trunk/libstdc++-v3/src/c++11/ios.cc - copied, changed from r215458, trunk/libstdc++-v3/src/c++98/ios.cc trunk/libstdc++-v3/src/c++11/iostream-inst.cc - copied, changed from r215458, trunk/libstdc++-v3/src/c++98/iostream-inst.cc trunk/libstdc++-v3/src/c++11/istream-inst.cc - copied, changed from r215458, trunk/libstdc++-v3/src/c++98/istream-inst.cc trunk/libstdc++-v3/src/c++11/ostream-inst.cc - copied, changed from r215458, trunk/libstdc++-v3/src/c++98/ostream-inst.cc trunk/libstdc++-v3/src/c++11/sstream-inst.cc - copied, changed from r215458, trunk/libstdc++-v3/src/c++98/sstream-inst.cc trunk/libstdc++-v3/src/c++11/streambuf-inst.cc - copied, changed from r215458, trunk/libstdc++-v3/src/c++98/streambuf-inst.cc trunk/libstdc++-v3/testsuite/27_io/basic_filebuf/cons/char/copy_neg.cc trunk/libstdc++-v3/testsuite/27_io/basic_fstream/assign/ trunk/libstdc++-v3/testsuite/27_io/basic_fstream/assign/1.cc trunk/libstdc++-v3/testsuite/27_io/basic_fstream/cons/move.cc trunk/libstdc++-v3/testsuite/27_io/basic_ifstream/assign/ trunk/libstdc++-v3/testsuite/27_io/basic_ifstream/assign/1.cc trunk/libstdc++-v3/testsuite/27_io/basic_ifstream/cons/move.cc trunk/libstdc++-v3/testsuite/27_io/basic_istringstream/assign/ trunk/libstdc++-v3/testsuite/27_io/basic_istringstream/assign/1.cc trunk/libstdc++-v3/testsuite/27_io/basic_istringstream/cons/move.cc trunk/libstdc++-v3/testsuite/27_io/basic_ofstream/assign/ trunk/libstdc++-v3/testsuite/27_io/basic_ofstream/assign/1.cc trunk/libstdc++-v3/testsuite/27_io/basic_ofstream/cons/move.cc trunk/libstdc++-v3/testsuite/27_io/basic_ostringstream/assign/ trunk/libstdc++-v3/testsuite/27_io/basic_ostringstream/assign/1.cc trunk/libstdc++-v3/testsuite/27_io/basic_ostringstream/cons/move.cc trunk/libstdc++-v3/testsuite/27_io/basic_stringstream/assign/ trunk/libstdc++-v3/testsuite/27_io/basic_stringstream/assign/1.cc trunk/libstdc++-v3/testsuite/27_io/basic_stringstream/cons/move.cc Removed: trunk/libstdc++-v3/src/c++98/ios-inst.cc trunk/libstdc++-v3/src/c++98/ios.cc trunk/libstdc++-v3/src/c++98/iostream-inst.cc trunk/libstdc++-v3/src/c++98/istream-inst.cc trunk/libstdc++-v3/src/c++98/ostream-inst.cc trunk/libstdc++-v3/src/c++98/sstream-inst.cc trunk/libstdc++-v3/src/c++98/streambuf-inst.cc Modified: trunk/libstdc++-v3/ChangeLog trunk/libstdc++-v3/config/abi/pre/gnu.ver trunk/libstdc++-v3/config/io/basic_file_stdio.h trunk/libstdc++-v3/include/bits/basic_ios.h trunk/libstdc++-v3/include/bits/fstream.tcc trunk/libstdc++-v3/include/bits/ios_base.h trunk/libstdc++-v3/include/bits/move.h trunk/libstdc++-v3/include/ext/stdio_filebuf.h trunk/libstdc++-v3/include/ext/stdio_sync_filebuf.h trunk/libstdc++-v3/include/std/fstream trunk/libstdc++-v3/include/std/ios trunk/libstdc++-v3/include/std/istream trunk/libstdc++-v3/include/std/ostream trunk/libstdc++-v3/include/std/sstream trunk/libstdc++-v3/include/std/streambuf trunk/libstdc++-v3/include/std/utility trunk/libstdc++-v3/src/c++11/Makefile.am trunk/libstdc++-v3/src/c++11/Makefile.in trunk/libstdc++-v3/src/c++98/Makefile.am trunk/libstdc++-v3/src/c++98/Makefile.in trunk/libstdc++-v3/src/c++98/ext-inst.cc trunk/libstdc++-v3/src/c++98/misc-inst.cc
Fixed for GCC 5