[c++] New features in c++11/14/17

 

This answer applies to C++03. For other C++ standards see:

• C++11 changes
• C++14 changes
• C++17 changes

 

 

 

c++11

---

字符串分割

#include <boost/algorithm/string.hpp>

std::string my_input("A,B,EE");
std::vector<std::string> results;

boost::algorithm::split(results, my_input, is_any_of(","));

assert(results[0] == "A");
assert(results[1] == "B");
assert(results[2] == "EE");

 

字符串转数字

// stoi example
#include <iostream>   // std::cout
#include <string>     // std::string, std::stoi

int main ()
{
  std::string str_dec = "2001, A Space Odyssey";　　// <----有点意思，可以自动默认转起始是数字的部分，只要开头是数字即可。
  std::string str_hex = "40c3";
  std::string str_bin = "-10010110001";
  std::string str_auto = "0x7f";

  std::string::size_type sz;   // alias of size_t

  int i_dec = std::stoi (str_dec,&sz);
  int i_hex = std::stoi (str_hex,nullptr,16);
  int i_bin = std::stoi (str_bin,nullptr,2);
  int i_auto = std::stoi (str_auto,nullptr,0);

  std::cout << str_dec << ": " << i_dec << " and [" << str_dec.substr(sz) << "]\n";
  std::cout << str_hex << ": " << i_hex << '\n';
  std::cout << str_bin << ": " << i_bin << '\n';
  std::cout << str_auto << ": " << i_auto << '\n';

  return 0;
}

 

In reality, not all operations are supported in all containers,