C++11: Declaring Functions That Do Not Throw Exceptions

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As of C++11, if a function does not throw any exceptions and does not call any functions that throw exceptions, you should explicitly state that a function does not throw exceptions. This indicates to client-code programmers that there’s no need to place calls to the function in a try block. Simply add noexcept to the right of the function’s parameter list in both the prototype and the definition. For a const member function, place noexcept after const. If a function that’s declared noexcept calls another function that throws an exception or executes a throw statement, the program terminates. ...

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