What are some useful string manipulation tips in C++?

What are some useful string manipulation tips in C++?

In C++, you can use the std::string class for various string manipulations. Here are a few tips:

1. Use append() to concatenate strings.
2. Use substr() to extract a substring.
3. Use find() to locate a substring within a string.
4. Use replace() to replace parts of a string.
5. Always remember to check the string's length before accessing its characters.

Can you give an example of using substr()?

Sure! Here's a simple example:

std::string str = "Hello, World!";
std::string sub = str.substr(7, 5); // This will extract "World"

This code takes the substring starting at index 7 with a length of 5.

What about searching for a substring?

You can use the find() method. For example:

std::string str = "Hello, World!";
size_t pos = str.find("World"); // pos will be 7 if found

If the substring is not found, find() returns std::string::npos.

Are there any performance considerations I should be aware of?

Yes, string manipulations can be costly in terms of performance, especially with large strings. It's best to minimize copying and use references when possible. Also, consider using std::string_view for non-owning references to strings.