Ios_base::trunc file open mode error

I am trying to create an fstream from a filename and an open mode. (Xcode 3.1.2 OS X leopard). I get a compile error :
std::fstream fileStream = std::fstream(filePath.c_str(), std::ios::trunc);
the error is :
/Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/iosfwd: In copy constructor 'std::basic_ios<char, std::char_traits<char> >::basic_ios(const std::basic_ios<char, std::char_traits<char> >&)':
/Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/bits/ios_base.h:779: error: 'std::iosbase::iosbase(const std::ios_base&)' is private
/Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/iosfwd:55: error: within this context
/Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/iosfwd: In copy constructor 'std::basic_fstream<char, std::char_traits<char> >::basic_fstream(const std::basic_fstream<char, std::char_traits<char> >&)':
/Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/iosfwd:95: warning: synthesized method 'std::basic_ios<char, std::char_traits<char> >::basic_ios(const std::basic_ios<char, std::char_traits<char> >&)' first required here
/Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/iosfwd: In copy constructor 'std::basic_filebuf<char, std::char_traits<char> >::basic_filebuf(const std::basic_filebuf<char, std::char_traits<char> >&)':
/Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/streambuf:772: error: 'std::basicstreambuf<CharT, Traits>::basicstreambuf(const std::basicstreambuf<CharT, _Traits>&) [with _CharT = char, _Traits = std::char_traits<char>]' is private
/Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/iosfwd:86: error: within this context
/Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/iosfwd: In copy constructor 'std::basic_fstream<char, std::char_traits<char> >::basic_fstream(const std::basic_fstream<char, std::char_traits<char> >&)':
/Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/iosfwd:95: warning: synthesized method 'std::basic_filebuf<char, std::char_traits<char> >::basic_filebuf(const std::basic_filebuf<char, std::char_traits<char> >&)' first required here
/Users/dlsa/code/toolboxgeneral/trunk/src/DSTextFileSerializer.cpp: In member function 'int DSTextFileSerializer::setPath(std::string)':
/Users/dlsa/code/toolboxgeneral/trunk/src/DSTextFileSerializer.cpp:29: warning: synthesized method 'std::basic_fstream<char, std::char_traits<char> >::basic_fstream(const std::basic_fstream<char, std::char_traits<char> >&)' first required here
/Users/dlsa/code/toolboxgeneral/trunk/src/DSTextFileSerializer.cpp: In member function 'virtual int DSTextFileSerializer::serialize()':
I looked at the <ios> header and the constants are public.
Help!

You are trying to copy the stream. Do this instead:
std::fstream fileStream(filePath.c_str(), std::ios::trunc);
Why are you using fstream and trunc? Just use ofstream and leave off the mode.

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