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40 lines
1.2 KiB
ReStructuredText
40 lines
1.2 KiB
ReStructuredText
.. title:: clang-tidy - modernize-use-transparent-functors
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modernize-use-transparent-functors
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==================================
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Prefer transparent functors to non-transparent ones. When using transparent
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functors, the type does not need to be repeated. The code is easier to read,
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maintain and less prone to errors. It is not possible to introduce unwanted
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conversions.
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.. code-block:: c++
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// Non-transparent functor
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std::map<int, std::string, std::greater<int>> s;
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// Transparent functor.
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std::map<int, std::string, std::greater<>> s;
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// Non-transparent functor
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using MyFunctor = std::less<MyType>;
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It is not always a safe transformation though. The following case will be
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untouched to preserve the semantics.
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.. code-block:: c++
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// Non-transparent functor
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std::map<const char *, std::string, std::greater<std::string>> s;
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Options
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-------
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.. option:: SafeMode
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If the option is set to `true`, the check will not diagnose cases where
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using a transparent functor cannot be guaranteed to produce identical results
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as the original code. The default value for this option is `false`.
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This check requires using C++14 or higher to run.
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