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C++17 in Detail: A Deep Dive

Example: String Split

Explore how to use std::string_view to split strings efficiently in C++17. Understand the benefits of non-owning views, algorithm details, and common pitfalls to handle persistent strings properly while avoiding empty substrings.

We'll cover the following...

string_view might be a potential optimization for string splitting. If you own a lar​ge persistent string, you might want to create a list of string_view objects that maps words of that larger string.

Note: The code is inspired by the article by Marco Arena - string_view odi et amo1.

C++ 17
#include <iostream>
#include <string>
#include <vector>
#include<algorithm>
using namespace std;
std::vector<std::string_view>
splitSV(std::string_view strv, std::string_view delims = " ")
{
  std::vector<std::string_view> output; auto first = strv.begin();
  while (first != strv.end()) {
    const auto second = std::find_first_of( first, std::cend(strv),
                                           std::cbegin(delims), std::cend(delims));
    if (first != second) {
      output.emplace_back(strv.substr(std::distance(strv.begin(), first), std::distance(first, second)));
    }
    if (second == strv.end())
      break;
    first = std::next(second);
  }
  return output; 
}
int main() {
  const std::string str {
    "Hello Extra,,, Super, Amazing World"
  };
  for (const auto& word : splitSV(str, " ,"))
    std::cout << word << '\n';
}

The algorithm iterates over the ...