What's Noexcept in C++?

The noexcept operator performs a compile-time check that returns true if an expression is declared to not throw any exceptions. It can be used within a function template's noexcept specifier to declare that the function will throw exceptions for some types but not others.

What is the use of Noexcept?

noexcept is primarily used to allow "you" to detect at compile-time if a function can throw an exception. Remember: most compilers don't emit special code for exceptions unless it actually throws something.

What is Noexcept specifier in C++?

noexcept as specifier. By declaring a function, a method, or a lambda-function as noexcept, you specify that these does not throw an exception and if they throw, you do not care and let the program just crash.