File: exception-baseclass.rst

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.. title:: clang-tidy - hicpp-exception-baseclass

hicpp-exception-baseclass
=========================

Ensure that every value that in a ``throw`` expression is an instance of
``std::exception``.

This enforces `rule 15.1 <http://www.codingstandard.com/section/15-1-throwing-an-exception/>`_
of the High Integrity C++ Coding Standard.

.. code-block:: c++

  class custom_exception {};

  void throwing() noexcept(false) {
    // Problematic throw expressions.
    throw int(42);
    throw custom_exception();
  }

  class mathematical_error : public std::exception {};

  void throwing2() noexcept(false) {
    // These kind of throws are ok.
    throw mathematical_error();
    throw std::runtime_error();
    throw std::exception();
  }