Use Cases for std::string_view

1#include <iostream>
2#include <fstream>
3#include <string>
4#include <string_view>
5
6void processLine(std::string_view line) {
7  // Process the line without copying
8  std::cout << "Processing: " << line << "\n";
9}
10
11int main() {
12  std::ifstream file{"large_file.txt"};
13  std::string line;
14  while (std::getline(file, line)) {
15    processLine(line);
16  }
17}

1#include <iostream>
2#include <string>
3#include <string_view>
4
5int main() {
6  std::string text{"Hello, World!"};
7  std::string_view view{text};
8
9  std::string_view hello = view.substr(0, 5);
10  std::string_view world = view.substr(7, 5);
11
12  std::cout << hello << " " << world;
13}

1#include <iostream>
2#include <string_view>
3
4void greet(std::string_view name) {
5  std::cout << "Hello, " << name << "!\n";
6}
7
8int main() {
9  std::string name{"Alice"};
10  greet(name);
11  greet("Bob");
12}

1#include <iostream>
2#include <string>
3#include <string_view>
4
5std::string_view trim(std::string_view str) {
6  const char* whitespace = " \t\n";
7  auto start = str.find_first_not_of(whitespace);
8  auto end = str.find_last_not_of(whitespace);
9  return str.substr(start, end - start + 1);
10}
11
12int main() {
13  std::string text{"  Hello, World!  "};
14  std::string_view trimmed = trim(text);
15  std::cout << "Trimmed: '" << trimmed << "'";
16}