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.. title:: clang-tidy - modernize-use-equals-delete
modernize-use-equals-delete
===========================
Identifies unimplemented private special member functions, and recommends using
``= delete`` for them. Additionally, it recommends relocating any deleted
member function from the ``private`` to the ``public`` section.
Before the introduction of C++11, the primary method to effectively "erase" a
particular function involved declaring it as ``private`` without providing a
definition. This approach would result in either a compiler error (when
attempting to call a private function) or a linker error (due to an undefined
reference).
However, subsequent to the advent of C++11, a more conventional approach emerged
for achieving this purpose. It involves flagging functions as ``= delete`` and
keeping them in the ``public`` section of the class.
To prevent false positives, this check is only active within a translation
unit where all other member functions have been implemented. The check will
generate partial fixes by introducing ``= delete``, but the user is responsible
for manually relocating functions to the ``public`` section.
.. code-block:: c++
// Example: bad
class A {
private:
A(const A&);
A& operator=(const A&);
};
// Example: good
class A {
public:
A(const A&) = delete;
A& operator=(const A&) = delete;
};
.. option:: IgnoreMacros
If this option is set to `true` (default is `true`), the check will not warn
about functions declared inside macros.
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