vector 与char *

通常使用vector<char>来存储二进制数据（比如网络数据包）.因此它会与char* 进行相互转换，具体方法如下例所示:

#include <iostream>
#include <vector>
#include <iterator>
#include <algorithm>
#include <cstring>

using namespace std;

void printVector(const vector<char>& v){
    cout << "vector content         : ";
    for_each(v.cbegin(), v.cend(), [](const char& val)->void{cout << val; });
    cout << endl;
}

int main() {

    vector<char> vdata;
    const char* in = "test1";
    vdata.insert(vdata.end(),in,in+strlen(in));
    vdata.insert(vdata.end(),'a');
    printVector(vdata);
    cout << endl;

    char* out = &vdata[0];
    cout <<"vector<char> --> char* : "<< out << endl;
    out[0] = 'j';//can changes the vector's content
    cout <<"vector<char> --> char* after change content: "<< out << endl;
    printVector(vdata);

    cout << endl;
    cout <<"get copied char* from vector<char>..."<<endl;
    char *buffer = new char[vdata.size()];
    std::copy(vdata.begin(), vdata.end(), buffer);
    cout <<"vector<char> --> char* : "<< buffer << endl;
    buffer[0] = 'z';//can changes the vector's content
    cout << "vector<char> --> char* after change content: "<< buffer << endl;
    printVector(vdata);

    return 0;
}