流，实在是搞不定了，请高手给看看

在vs2005下没问题，在gcc下狂错！！！什么原因啊？？？
急啊！！！谢谢啦！
源文件：
#include <iostream>
#include <fstream>

using namespace std;

template <class Ch, class Tr = char_traits<Ch> >
class basic_nullstreambuf : public basic_streambuf<Ch, Tr>
{
public:
basic_nullstreambuf(void)
{
};

virtual ~basic_nullstreambuf(void)
{
};

protected:
virtual streampos seekoff(
streamoff off,
ios::seek_dir dir,
int nMode = ios::in | ios::out)
    {
return Tr::eof();
};

virtual streampos seekpos(
streampos pos,
int nMode = ios::in | ios::out)
{
return Tr::eof();
};

virtual int overflow(int nCh = Tr::eof())
{
return 0;
};

virtual int underflow(void)
{
return Tr::eof();
};
};

typedef basic_nullstreambuf<char> nullstreambuf;

class nullstream : public ostream
{
public:
nullstream(): ostream(new nullstreambuf())
{
};

virtual ~nullstream()
{
};
};

class ClassB
{
public:

ClassB()
{
m_pStream = &m_NullStream;
};

~ClassB()
{
};

void setOut(ostream &out)
{
m_pStream = &out;
};

ostream &out()
{
return *m_pStream;
};

ostream &getNullStream() const
{
return m_NullStream;
};
private:
static nullstream m_NullStream;
ostream *m_pStream;
};

nullstream ClassB::m_NullStream;

int main()
{
ofstream file("B.txt");
ClassB obj;
obj.setOut(file);

cout << "Where is this first message output?" << endl;

obj.out() << "Where is this second message output?" << endl;

file.close();
return 0;
}

给出的错误提示：
ostreamTest.cpp:22: no type `seek_dir' in `std::basic_ios<char,
   std::char_traits<char> >'
ostreamTest.cpp:22: parse error before `,' token
ostreamTest.cpp:24: default template arguments may not be used in function
   templates
ostreamTest.cpp:24: template definition of non-template `virtual std::streampos
   std::basic_ios<char, std::char_traits<char> >::seekoff(...)'
ostreamTest.cpp:24: template definition of non-template `virtual std::streampos
   basic_nullstreambuf<Ch, Tr>::seekoff(...)'
ostreamTest.cpp:46: wrong number of template arguments (1, should be 2)
ostreamTest.cpp:8: provided for `template<class Ch, class Tr> class
   basic_nullstreambuf'
ostreamTest.cpp:46: ISO C++ forbids declaration of `nullstreambuf' with no type
ostreamTest.cpp: In constructor `nullstream::nullstream()':
ostreamTest.cpp:53: no matching function for call to `std::basic_ostream<char,
   std::char_traits<char> >::basic_ostream(nullstreambuf*&)'
/usr/include/c++/3.2.2/iosfwd:61: candidates are: std::basic_ostream<char,
   std::char_traits<char> >::basic_ostream(const std::basic_ostream<char,
   std::char_traits<char> >&)
/usr/include/c++/3.2.2/ostream:72:                 std::basic_ostream<_CharT,
   _Traits>::basic_ostream(std::basic_streambuf<_CharT, _Traits>*) [with _CharT
   = char, _Traits = std::char_traits<char>]

5 个解决方案

#1

可能是模板嵌套的问题

#2

模板里面的模板用typedef试试

#3

至少，你先把seekdir搞定掉。按编译提示，它不在ios里，你就去找出正确的地方呀。
你现在写的代码肯定是强烈耦合于VS2005的私有实现了。

#4

http://poli.cs.vsb.cz/c/help/iostream.htm

seek_dir 是一个枚举常量，
如果找不到的话，
从 VS 中拷贝这个枚举定义过来看看 ······

#5

呃，是seekdir

#1