Here is a list of all functions with links to the files they belong to:

• operator<<() : attribute.hpp, attribute_set.hpp, message_type_details.hpp, messaging_pattern.hpp, static_config.hpp, static_config_blackboard.hpp, static_config_event.hpp, static_config_publish_subscribe.hpp, static_config_request_response.hpp, type_variant.hpp, duration.hpp, static_string.hpp, static_vector.hpp
• stream_operator() : optional.hpp