std:vector<char>

实战c++中的string系列--std:vector 和std:string相互转换(vector to stringstream)

有时候也会遇到std:vector与转std:string 相互转换的情况。

首先看一下vector<char>如何转string：

std::vector<char> *data = response->getResponseData();
std::string res;
//方法一
for (int i = 0;i<data->size();++i) {
  res+=(*data)[i];
}
res+="";
std:cout << res;

 //方法二
std::vector<char> *data = response->getResponseData();
std::string res;
res.insert(res.begin(), data->begin(), data->end());
std::cout << res;

 //方法三
std::vector<char> *data = response->getResponseData();
std::string res;
const char* s = &(*data->begin());
res = std::string(s, data->size());
std::cout << res;

//方法四
string ch = "what a fucking day!";
vector <char> ta;
ta.resize(ch.size());
ta.assign(ch.begin(),ch.end());

string 转vector就会更容易：

vector <char> ta = {‘a’, "b", "c"};
ch.clear();
ch.assign(ta.begin(),ta.end());

================================================================ 
vector to stringstream

#include <iostream>
#include <sstream>
#include <vector>
#include <string>
#include <iterator>

 // Dummy std::vector of strings
 std::vector<std::string> sentence;
 sentence.push_back("aa");
 sentence.push_back("ab");

 // Required std::stringstream object
 std::stringstream ss;

 // Populate
 std::copy(sentence.begin(), sentence.end(),std::ostream_iterator<std::string>(ss,"
"));

 // Display
 std::cout<<ss.str()<<std::endl;