stream_iterator除了能使用cin外，只要是stream都可用，如fstream，stringstream都可用。本範例demo如何利用stream_iterator將文字檔的每個單字轉到vector內。
1 
/**/ /* 2
(C) OOMusou 2006 http://oomusou.cnblogs.com 3 4Filename : StreamIteratorInFileOutFile.cpp 5Compiler : Visual C++ 8.0 / ISO C++ 6Description : Demo how to use istream_iterator from file to vector 7 and ostream_iterator from vector to file 8Release : 12/07/2006 9
*/ 10 
11 #include < fstream > 12 #include < iostream > 13 #include < vector > 14 #include < algorithm > 15 #include < string > 16 #include < iterator > 17 18 using namespace std; 19 20 int main() 
{ 21 ifstream inFile("books-11-30-2006.txt");22 vector<string> svec;2324 // Copy cin to vector25 copy(istream_iterator<string>(inFile), istream_iterator<string>(), back_inserter(svec));2627 // Sort vector28 sort(svec.begin(), svec.end());2930 // Copy vector to cout31 ofstream outFile("books-11-30-2006_r.txt");32 copy(svec.begin(), svec.end(), ostream_iterator<string>(outFile,"\n"));3334 inFile.close();35 outFile.close();36}
使用這種寫法，優點是程式碼非常精簡，但缺點是一定得用一個Container接，如vector，實務上可能邊讀文字檔邊處理就好。 /**/ /* 2(C) OOMusou 2006 http://oomusou.cnblogs.com 3 4Filename : StreamIteratorInFileOutFile.cpp 5Compiler : Visual C++ 8.0 / ISO C++ 6Description : Demo how to use istream_iterator from file to vector 7 and ostream_iterator from vector to file 8Release : 12/07/2006 9*/ 10 11 #include < fstream > 12 #include < iostream > 13 #include < vector > 14 #include < algorithm > 15 #include < string > 16 #include < iterator > 17 18 using namespace std; 19 20 int main() { 21 ifstream inFile("books-11-30-2006.txt");22 vector<string> svec;2324 // Copy cin to vector25 copy(istream_iterator<string>(inFile), istream_iterator<string>(), back_inserter(svec));2627 // Sort vector28 sort(svec.begin(), svec.end());2930 // Copy vector to cout31 ofstream outFile("books-11-30-2006_r.txt");32 copy(svec.begin(), svec.end(), ostream_iterator<string>(outFile,"\n"));3334 inFile.close();35 outFile.close();36} Keyword stream_iterator, copy, vector, text
See Also