使用方法：
使用filebuf開啟檔案，並拷貝給istream/ostream。
如下面的例子中，實現讀取並處理deseq資料夾下所有檔案，輸出到ostream fw.
code:
[cpp]view plain
copy
#include
#include
#include
#include
#include
#include
using namespace std;
void parsefile(istream& fi, ostream& fo)
} void process()
} }
} int main()
其中，parsefile的宣告為：void parsefile(istream& fi, ostream& fo)
注意這裡函式宣告必須要加引用，不然會報錯：
錯誤：$ g++ -g test.cpp -o b.out
in file included from /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ios:39,
from /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/ostream:40,
from /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/iostream:40,
from test.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/ios_base.h: in copy constructor 'std::basic_ios>::basic_ios(const std::basic_ios>&)':
/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/ios_base.h:790: error: 'std::ios_base::ios_base(const std::ios_base&)' is private
/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/iosfwd:47: error: within this context
/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/iosfwd: in copy constructor 'std::basic_istream>::basic_istream(const std::basic_istream>&)':
/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/iosfwd:53: note: synthesized method 'std::basic_ios>::basic_ios(const std::basic_ios>&)' first required here
test.cpp: in function 'void process()':
test.cpp:24: note: synthesized method 'std::basic_istream>::basic_istream(const std::basic_istream>&)' first required here
test.cpp:24: error: initializing argument 1 of 'void parsefile(std::istream, std::ostream)'
原因是stream型別資料不支援拷貝，所以必須傳址。
參考：from:
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