Split string in a very smart way using C++11 variadic templace : split(" str1 ::str2;;3.14,,", " :,", str1_var, str2_var, int_val);

split.cxx

//Copyright Michael Bacci - 2017
//Apache 2.0 license

/**
 * Split string in a smart way using C++11 variadic template.
 * You can copy/paste this code in your library just citing the source.
 */

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

template<typename T>
std::vector<T>
split(const T &str, const T &delimiters) {
  std::vector<T> v;
  typename T::size_type start, pos = 0;

  auto emplace = [&] { if (pos != start) v.emplace_back(str, start, pos - start); };
  {
    start = 0;
    while ((pos = str.find_first_of(delimiters, start)) != T::npos) {
      emplace();
      start = pos + 1;
    }
    pos = str.length();
  }

  emplace();

  return v;
}

std::vector<std::string>
split(const std::string &str, const std::string &delimiters) {
  return split<std::string>(str, delimiters);
}

template<typename T, typename... TArgs>
std::vector<std::string>
split(const std::string &str, const std::string &delimiters, T &arg, TArgs &...Fargs) {
  std::vector<std::string> v;
  std::string sub_str;

  typename std::string::size_type start, pos;
  start = 0;

  while ((pos = str.find_first_of(delimiters, start)) != std::string::npos && pos == start)
    start = pos + 1;

  auto assign_to_arg = [&] (const std::string::size_type pos){
    std::string sub(str, start, pos - start);
    v.push_back(sub);
    std::stringstream ss;
    ss << sub;
    ss >> arg;
  };

  if (pos != std::string::npos) {
    assign_to_arg(pos);
    sub_str = std::string(str.begin() + pos, str.end());
    auto sub_v = split(sub_str, delimiters, Fargs...);
    v.insert(v.end(), sub_v.begin(), sub_v.end());
  } else if (start < str.length()) {
    assign_to_arg(str.length());
  }

  return v;
}

int main() {

  std::string str;
  int range_min;
  int range_max;
  float value;

  for (auto s : split(" :STRING :3 - 8 -:- 967.314 ", "- :", str, range_min, range_max, value))
    std::cout << s << ";";

  std::cout << std::endl << str << ";" << range_min << ";" << range_max << ";" << value << ";" << std::endl << std::endl;


  std::string first;
  int second;
  for (auto s : split("::::A 16::3-7,8:", ",- :", first, second))
    std::cout << s << ";";

  std::cout << std::endl << first << ";" << second << ";" << std::endl;

  assert(split("::::", ",- :", first, second).size() == 0);
  assert(split(": :COOL1: :COOL2;;COOL3--", " ;,- :", first).size() == 3);
  assert(first == "COOL1");

  return 0;
}

The output is:

STRING;3;8;967.314;
STRING;3;8;967.314;

A;16;3;7;8;
A;16;