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Error handling possibilities

  • Terminate the program.
  • Return an error value.
  • Return a legal value and leave the program in an “error state” (errno).
  • Call an error-handler routine.


C++ standard library provides one of the following guarantees for every library operation:

  • basic for all operations: The basic invariants of all objects are maintained, and no resources, such as memory, are leaked. In particular, the basic invariants of every built-in and standard-library type guarantee that you can destroy an object or assign to it after every standard-library operation (§iso.
  • strong for key operations: in addition to providing the basic guarantee, either the operation succeeds, or it has no effect. This guarantee is provided for key operations, such as push_back(), single-element insert() on a list, and uninitialized_copy().
  • nothrow for some operations: in addition to providing the basic guarantee, some operations are guaranteed not to throw an exception. This guarantee is provided for a few simple operations, such as swap() of two containers and pop_back().
c_exceptions.1517569330.txt.gz · Last modified: 2018/02/02 11:02 by rpjday