What methods of improving string performance in C++ are used to enhance their efficiency?

The following methods are used to improve the efficiency of string operations in C++:

• Using std::string_view for passing and processing strings without copying data.
• Pre-allocating memory with std::string::reserve() to avoid multiple allocations during concatenation.
• Using move semantics to transfer strings without copying.
• Minimizing the creation of temporary string objects, for example, by concatenating with operator+= instead of creating new strings.
• Using emplace methods in containers to insert strings without unnecessary copying.

Example with memory reservation:

std::string s;
s.reserve(100); // reserve memory for 100 characters
s += "Hello, ";
s += "world!";

This helps avoid repeated allocations when adding data to the string.