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# rosidl_runtime_cpp Features

## Typesupport function handler

`rosidl_runtime_cpp` provides several templated function declarations for getting the type support handler.
They are meant to be defined in each rosidl definition's C++ generated code.
They are defined for both the `rosidl_runtime_cpp` and `rosidl_typesupport_cpp` namespaces.

`rosidl_runtime_cpp`
* Messages (`message_type_support_decl.hpp`)
* Services (`service_type_support_decl.hpp`)
* Actions (`action_type_support_decl.hpp`)

`rosidl_typesupport_cpp`
* Messages (`message_type_support.hpp`)
* Services (`service_type_support.hpp`)
* Actions (`action_type_support.hpp`)

## C++ Type Traits

`rosidl_runtime_c` provides numerous C++ Type Traits for rosidl interfaces in `traits.hpp`.
These type traits are useful for providing compile-time checks of rosidl C++ types.

## Bounded Vector

Provided in `bounded_vector.hpp` is an implementation of a std::vector like container class, that has a bounded capacity.
This class is utilized by rosidl types that declare a bounded sequence.