What are user-defined string literals in C++17?

What are user-defined string literals in C++17?

User-defined string literals allow you to create custom types from string literals, enhancing code readability.

Can you give me an example of how to define one?

Sure! You can define a user-defined string literal like this:

#include <iostream>
#include <string>

std::string operator" _mystr"(const char* str) {
    return std::string(str) + " - modified";
}

int main() {
    std::string myString = "Hello"_mystr;
    std::cout << myString; // Outputs: Hello - modified
}

This creates a new string literal suffix _mystr.

What are the benefits of using user-defined string literals?

They improve code clarity and allow for type-safe string manipulation, making your code more expressive.