clang-tidy - modernize-use-transparent-functors — Extra Clang Tools 21.1.8 documentation

# Extra Clang Tools 21.1.8 documentation

## clang-tidy - modernize-use-transparent-functors

# modernize-use-transparent-functors

Prefer transparent functors to non-transparent ones. When using transparent functors, the type does not need to be repeated. The code is easier to read, maintain and less prone to errors. It is not possible to introduce unwanted conversions.

    // Non-transparent functor
    std::map<int, std::string, std::greater<int>> s;

    // Transparent functor.
    std::map<int, std::string, std::greater<>> s;

    // Non-transparent functor
    using MyFunctor = std::less<MyType>;

It is not always a safe transformation though. The following case will be untouched to preserve the semantics.

    // Non-transparent functor
    std::map<const char *, std::string, std::greater<std::string>> s;

## Options

SafeMode

  If the option is set to true, the check will not diagnose cases where using a transparent functor cannot be guaranteed to produce identical results as the original code. The default value for this option is false.

This check requires using C++14 or higher to run.