實戰c++中的string系列--std:vector(char) 和std:string相互轉換(vector to stringstream)

實戰c++中的string系列--std:vector(char) 和std:string相互轉換(vector to stringstream)

有時候也會遇到std:vector與轉std:string 相互轉換的情況。

首先看一下vector如何轉string：

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

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

 //方法三
std::vector *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  ta;
ta.resize(ch.size());
ta.assign(ch.begin(),ch.end());

string 轉vector就會更容易：

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

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

#include 
#include 
#include 
#include 
#include 

 // Dummy std::vector of strings
 std::vector 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(ss,"\n"));

 // Display
 std::cout<