.. title:: clang-tidy - modernize-use-noexcept

modernize-use-noexcept
======================

This check replaces deprecated dynamic exception specifications with
the appropriate noexcept specification (introduced in C++11). By
default this check will replace ``throw()`` with ``noexcept``,
and ``throw(<exception>[,...])`` or ``throw(...)`` with
``noexcept(false)``.

Example
-------

.. code-block:: c++

  void foo() throw();
  void bar() throw(int) {}

transforms to:

.. code-block:: c++

  void foo() noexcept;
  void bar() noexcept(false) {}

Options
-------

.. option:: ReplacementString

  Users can use :option:`ReplacementString` to specify a macro to use
  instead of ``noexcept``. This is useful when maintaining source code
  that uses custom exception specification marking other than
  ``noexcept``. Fix-it hints will only be generated for non-throwing
  specifications.

Example
^^^^^^^

.. code-block:: c++

  void bar() throw(int);
  void foo() throw();

transforms to:

.. code-block:: c++

  void bar() throw(int);  // No fix-it generated.
  void foo() NOEXCEPT;

if the :option:`ReplacementString` option is set to `NOEXCEPT`.

.. option:: UseNoexceptFalse

Enabled by default, disabling will generate fix-it hints that remove
throwing dynamic exception specs, e.g., ``throw(<something>)``,
completely without providing a replacement text, except for
destructors and delete operators that are ``noexcept(true)`` by
default.

Example
^^^^^^^

.. code-block:: c++

  void foo() throw(int) {}

  struct bar {
    void foobar() throw(int);
    void operator delete(void *ptr) throw(int);
    void operator delete[](void *ptr) throw(int);
    ~bar() throw(int);
  }

transforms to:

.. code-block:: c++

  void foo() {}

  struct bar {
    void foobar();
    void operator delete(void *ptr) noexcept(false);
    void operator delete[](void *ptr) noexcept(false);
    ~bar() noexcept(false);
  }

if the :option:`UseNoexceptFalse` option is set to `false`.