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.. title:: clang-tidy - bugprone-standalone-empty
bugprone-standalone-empty
=========================
Warns when ``empty()`` is used on a range and the result is ignored. Suggests
``clear()`` if it is an existing member function.
The ``empty()`` method on several common ranges returns a Boolean indicating
whether or not the range is empty, but is often mistakenly interpreted as
a way to clear the contents of a range. Some ranges offer a ``clear()``
method for this purpose. This check warns when a call to empty returns a
result that is ignored, and suggests replacing it with a call to ``clear()``
if it is available as a member function of the range.
For example, the following code could be used to indicate whether a range
is empty or not, but the result is ignored:
.. code-block:: c++
std::vector<int> v;
...
v.empty();
A call to ``clear()`` would appropriately clear the contents of the range:
.. code-block:: c++
std::vector<int> v;
...
v.clear();
Limitations:
* Doesn't warn if ``empty()`` is defined and used with the ignore result in the
class template definition (for example in the library implementation). These
error cases can be caught with ``[[nodiscard]]`` attribute.
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