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。
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/**/
/*
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(C) OOMusou 2006 http://oomusou.cnblogs.com
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Filename : StreamIteratorInFileOutFile.cpp
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Compiler : Visual C++ 8.0 / ISO C++
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Description : Demo how to use istream_iterator from file to vector
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and ostream_iterator from vector to file
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Release : 12/07/2006
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*/
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#include
<
fstream
>
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#include
<
iostream
>
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#include
<
vector
>
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#include
<
algorithm
>
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#include
<
string
>
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#include
<
iterator
>
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using
namespace
std;
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int
main()
{
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ifstream inFile("books-11-30-2006.txt");
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vector<string> svec;
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// Copy cin to vector
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copy(istream_iterator<string>(inFile), istream_iterator<string>(), back_inserter(svec));
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// Sort vector
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sort(svec.begin(), svec.end());
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// Copy vector to cout
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ofstream outFile("books-11-30-2006_r.txt");
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copy(svec.begin(), svec.end(), ostream_iterator<string>(outFile,"\n"));
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inFile.close();
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outFile.close();
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}


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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。
Keyword
stream_iterator, copy, vector, text