27 lines
910 B
ReStructuredText
27 lines
910 B
ReStructuredText
.. title:: clang-tidy - readability-container-size-empty
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readability-container-size-empty
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================================
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Checks whether a call to the ``size()`` method can be replaced with a call to
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``empty()``.
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The emptiness of a container should be checked using the ``empty()`` method
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instead of the ``size()`` method. It is not guaranteed that ``size()`` is a
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constant-time function, and it is generally more efficient and also shows
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clearer intent to use ``empty()``. Furthermore some containers may implement
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the ``empty()`` method but not implement the ``size()`` method. Using
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``empty()`` whenever possible makes it easier to switch to another container in
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the future.
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The check issues warning if a container has ``size()`` and ``empty()`` methods
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matching following signatures:
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.. code-block:: c++
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size_type size() const;
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bool empty() const;
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`size_type` can be any kind of integer type.
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