iterator (迭代器）的应用的用法（二）

 其中end_of_stream定义为空的迭代器对象，用作结束迭代器。绑定流上的迭代器在遇到文件结束或某个错误时，将等于结束迭代器的值。

示例2

#include "map"
#include "set"
#include "vector"
#include "string"
#include "fstream"
#include "iostream"
#include "sstream"
#include "iterator"
using namespace std;

int main(int argc, char **argv)
{
    ostream_iterator<string> out_iter(cout, "\n");
    istream_iterator<string> in_iter(cin), EndOfStream;
    while(EndOfStream != in_iter)
    {
        *out_iter++ = *in_iter++;
    }
    return 0;
}
先iter++,返回iter，再*iter。
示例3
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#include "map"
#include "set"
#include "vector"
#include "string"
#include "fstream"
#include "iostream"
#include "sstream"
#include "iterator"
#include "algorithm"
using namespace std;

int main(int argc, char **argv)
{
    ifstream infile("C:\\1.txt");
    istream_iterator<int> cin_it(infile);
    istream_iterator<int> EndOfStream;
    vector<int> vec(cin_it, EndOfStream);
    sort(vec.begin(), vec.end());
    ostream_iterator<int> output(cout, " ");
    unique_copy(vec.begin(), vec.end(), output);
    return 0;
}