In C++, a try-catch block is used for exception handling. It allows you to write code that can detect and handle errors that may occur during runtime. A try block is followed by one or more catch blocks, which handle specific types of exceptions that may be thrown. If an exception is thrown inside the try block, the program jumps to the first matching catch block, which handles the exception.

A generic try-catch block in C++ can be written as follows:

try {
    // code that may throw an exception
} catch (...) {
    // code to handle any type of exception
}

In this block, ... is called an ellipsis, which is used to catch any type of exception that may be thrown by the code inside the try block. This is useful when you don't know exactly what type of exception may be thrown, or when you want to handle all exceptions in the same way.

However, it is generally recommended to catch specific types of exceptions instead of using a generic catch-all block, as this allows you to handle different exceptions in different ways, and provides more specific error messages to the user.