File: use-equals-default.rst

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.. title:: clang-tidy - modernize-use-equals-default

modernize-use-equals-default
============================

This check replaces default bodies of special member functions with ``=
default;``. The explicitly defaulted function declarations enable more
opportunities in optimization, because the compiler might treat explicitly
defaulted functions as trivial.

.. code-block:: c++

  struct A {
    A() {}
    ~A();
  };
  A::~A() {}

  // becomes

  struct A {
    A() = default;
    ~A();
  };
  A::~A() = default;

.. note::
  Move-constructor and move-assignment operator are not supported yet.

Options
-------

.. option:: IgnoreMacros

   If set to `true`, the check will not give warnings inside macros and will
   ignore special members with bodies contain macros or preprocessor directives.
   Default is `true`.