Restrict String Length

1#include <iostream>
2#include <string>
3
4int main() {
5  std::string Text{"This is a very long string"};
6  size_t MaxLength{10};
7
8  if (Text.size() > MaxLength) {
9    Text.resize(MaxLength);  
10  }
11
12  std::cout << Text;
13}

1#include <iostream>
2#include <string>
3
4int main() {
5  std::string Input;
6  size_t MaxLength{10};
7
8  std::cout << "Enter a string (max "
9    << MaxLength << " characters): ";
10  std::cin >> Input;
11
12  if (Input.size() > MaxLength) {
13    Input.resize(MaxLength);  
14  }
15
16  std::cout << "Input: " << Input;
17}

1#include <iostream>
2#include <string>
3
4int main() {
5  std::string Text;
6  Text.reserve(10);  
7
8  Text = "Hello";
9  Text += "World!"; // Exceeds reserved size 
10
11  std::cout << Text << " (Capacity: "
12    << Text.capacity() << ")";
13}

1#include <iostream>
2#include <string>
3
4void EnsureMaxLength(
5  std::string& str, size_t maxLength
6) {
7  if (str.size() > maxLength) {
8    str.resize(maxLength);  
9  }
10}
11
12int main() {
13  std::string Text{"This is a long string"};
14  size_t MaxLength{10};
15
16  EnsureMaxLength(Text, MaxLength);
17
18  std::cout << Text;
19}