istream_iterator, ostream_iterator,copy以及文件序列化

最新推荐文章于 2024-11-02 23:53:01 发布

hkx1n

最新推荐文章于 2024-11-02 23:53:01 发布

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分类专栏： C/C++ 文章标签： iterator os include null

本文链接：https://blog.youkuaiyun.com/hkx1n/article/details/6148245

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#include <iostream>
#include <fstream>
#include <algorithm>
#include <cassert>
#include <numeric>
#include <string>
using namespace std;

int main()
{
vector<int> vec_int;
for (int i=0; i<10; i++)
  vec_int.push_back(i);
partial_sum(vec_int.begin(), vec_int.end(), vec_int.begin());
vector<double> vec_double;
for (int i=0; i<10; i++)
  vec_double.push_back(2.11);
partial_sum(vec_double.begin(), vec_double.end(), vec_double.begin());
vector<string> vec_str;
for (int i=0; i<10; i++)
  vec_str.push_back("hkx");
partial_sum(vec_str.begin(), vec_str.end(), vec_str.begin());
//
ostream_iterator<int> out(cout, ";");
copy(vec_int.begin(), vec_int.end(), out);
ostream_iterator<double> out1(cout, ";");
copy(vec_double.begin(), vec_double.end(), out1);
ostream_iterator<string> out2(cout, ";");
copy(vec_str.begin(), vec_str.end(), out2);
//

ofstream ofs;
ofs.open("hkx.dat");
assert(ofs!= 0);
ostream_iterator<int> os(ofs, ";");
copy(vec_int.begin(), vec_int.end(), os);
ostream_iterator<double> os1(ofs, ";");
copy(vec_double.begin(), vec_double.end(), os1);
ostream_iterator<string> os2(ofs, ";");
copy(vec_str.begin(), vec_str.end(), os2);
ofs.close(); //必须close,否则下面的ofstream中读取不到数据
//

ifstream ifs;
ifs.open("hkx.dat");
assert(ifs != NULL);
vec_int.clear();
vec_double.clear();
vec_str.clear();

copy(istream_iterator<int>(ifs), istream_iterator<int>(), back_inserter(vec_int));
int ttm = vec_int.size();
copy(vec_int.begin(), vec_int.end(), ostream_iterator<int>(cout, " "));

ifs.clear();
ifs.ignore(10, ';');
copy(istream_iterator<double>(ifs), istream_iterator<double>(), back_inserter(vec_double));
copy(vec_double.begin(), vec_double.end(), ostream_iterator<double>(cout, " "));

ifs.clear();
ifs.ignore(10, ';');
copy(istream_iterator<string>(ifs), istream_iterator<string>(), back_inserter(vec_str));
copy(vec_str.begin(), vec_str.end(), ostream_iterator<string>(cout, " "));

return 0;
}