How does the use of std::move affect the resources and state of objects in C++?

Using std::move in C++ explicitly indicates that an object can be moved rather than copied. This affects the resources and state of objects as follows:

• Resources (such as dynamic memory, file descriptors) from the source object are transferred to the new object without copying.
• The source object remains in a valid but unspecified state after the move (usually "empty" or "null").

Example:

std::string s1 = "Hello";
std::string s2 = std::move(s1); // s2 now owns s1's resources
// s1 is now an empty string

This increases performance, especially when working with large objects, as it avoids costly copy operations.