Real-World Examples of Using std::ranges::none_of()

1#include <algorithm>
2#include <iostream>
3#include <string>
4#include <vector>
5
6int main() {
7  std::vector<std::string> fields{
8    "username", "password", "email"};
9
10  auto isEmpty = [](const std::string& field) {
11    return field.empty();  
12  };
13
14  bool allFieldsFilled = std::ranges::none_of(
15    fields, isEmpty);  
16
17  std::cout << "All fields filled: "
18    << (allFieldsFilled ? "Yes" : "No");
19}

1#include <algorithm>
2#include <iostream>
3#include <vector>
4
User Class|Show
5class User {/*...*/};
19
20int main() {
21  std::vector<User> users {
22    User{"Alice", false},
23    User{"Bob", false},
24    User{"Charlie", false}
25  };
26
27  bool noAdmins = std::ranges::none_of(
28    users, &User::hasAdminRights); 
29
30  std::cout << "No admin users: "
31    << (noAdmins ? "Yes" : "No");
32}

1#include <algorithm>
2#include <iostream>
3#include <vector>
4
5int main() {
6  std::vector<int> data {10, 20, 30, 40, 50};
7
8  auto isNegative = [](int value) {
9    return value < 0; 
10  };
11
12  bool allPositive = std::ranges::none_of(
13    data, isNegative); 
14
15  std::cout << "All values positive: "
16    << (allPositive ? "Yes" : "No");
17}