Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Version history :: Boost Libraries Documentation

Version history

Boost 1.90

  • feat/backmp11: New back-end backmp11, requires C++ 17

  • fix/back: boost::any stopped working as Kleene event

  • feat: The documentation has been refurbished, it is now built with Antora

Boost 1.85

  • Backend update (back11). Requires C++ 11. The documentation now uses it as default.

  • New front-end (PlantUML). Requires C++ 20

  • Div. bugfixes

Boost 1.72

  • Merged from develop new implementation of deferred events

  • Div. bugfixes

Boost 1.57

  • Fixed BOOST_MSM_EUML_EVENT_WITH_ATTRIBUTES (broken in 1.56).

  • Fixed execute_queued_events, added execute_single_queued_event

  • Fixed warnings for unused variables

Boost 1.56

  • Bugfix: no_transition in case of an exception.

  • Bugfix: Trac 9280

  • Bugfix: incomplete namespace names in eUML

Boost 1.55

  • New feature: interrupt states now support a sequence of events to end the interruption

  • Bugfix: Trac 8686.

Boost 1.54

  • Bugfix: Exit points broken for the favor_compile_time policy.

  • Bugfix: copy breaks exit points of subsubmachines.

  • Bugfix: Trac 8046.

From V2.23 to V2.24 (Boost 1.51)

  • Support for boost::any or kleene as an acceptable event.

  • Bugfix: compiler error with fsm internal table and none(compound) event.

  • Bugfix: euml::defer_ leading to stack overflow.

From V2.22 to V2.23 (Boost 1.50)

  • eUML : better syntax for front-ends defined with eUML as transititon table only. Caution: Breaking Change!

  • Bugfix: graph building was only working if initial_state defined as a sequence

  • Bugfix: flags defined for a Terminate or Interrupt state do not break the blocking function of these states any more.

  • Bugfix: multiple deferred events from several regions were not working in every case.

  • Bugfix: visitor was passed by value to submachines.

  • Bugfix: no_transition was not called for submachines who send an event to themselves.

  • Fixed warnings with gcc

From V2.21 to V2.22 (Boost 1.48)

  • eUML: added easier event reprocessing: process(event_) and reprocess()

  • Rewrite of internal transition tables. There were a few bugs (failing recursivity in internal transition tables of sub-sub machines) and a missing feature (unused internal transition table of the main state machine).

  • Bugfixes

    • Reverted favor_compile_time policy to Boost 1.46 state

    • none event now is convertible from any other event

    • eUML and pseudo exit states

    • Fixed not working Flag_AND

    • Fixed rare bugs causing multiple processing of the same event in a submachine whose transition table contains this event and a base event of it.

    • gcc warnings about unused variables

  • Breaking change: the new internal transition table feature causes a minor breaking change. In a submachine, the "Fsm" template parameter for guards / actions of an internal table declared using internal_transition_table now is the submachine, not the higher-level state machine. Internal transitions declared using internal rows in the higher-level state machine keep their behavior (the "Fsm" parameter is the higher-level state machine). To sum up, the internal transition "Fsm" parameter is the closest state machine containing this transition.

From V2.20 to V2.21 (Boost 1.47)

  • Added a stop() method in the back-end.

  • Added partial support for Boost.Phoenix functors in eUML

  • Added the possibility to choose when state switching occurs.

  • Bugfixes

    • Trac 5117, 5253, 5533, 5573

    • gcc warnings about unused variables

    • better implemenation of favor_compile_time back-end policy

    • bug with eUML and state construction

    • incorrect eUML event and state macros

    • incorrect event type passed to a direct entry state’s on_entry action

    • more examples

From V2.12 to V2.20 (Boost 1.46)

  • Compile-time state machine analysis using mpl_graph:

    • checking of region orthogonality.

    • search for unreachable states.

    • automatic region index search for pseudo entry or explicit entry states.

  • Boost.Parameter interface definition for msm::back::state_machine<> template arguments.

  • Possibility to provide a container for the event and deferred event queues. A policy implementation based on a more efficient Boost.CircularBuffer is provided.

  • msm::back::state_machine<>::is_flag_active method made const.

  • added possibility to enqueue events for delayed processing.

  • Bugfixes

    • Trac 4926

    • stack overflow using the Defer functor

    • anonymous transition of a submachine not called for the initial state

From V2.10 to V2.12 (Boost 1.45)

  • Support for serialization

  • Possibility to use normal functors (from functor front-end) in eUML.

  • New constructors where substates / submachines can be taken as arguments. This allows passing arguments to the constructor of a submachine.

  • Bugfixes

From V2.0 to V2.12 (Boost 1.44)

  • New documentation

  • Internal transitions. Either as part of the transition table or using a state’s internal transition table

  • increased dispatch and copy speed

  • new row types for the basic front-end

  • new eUML syntax, better attribute support, macros to ease developer’s life. Even VC8 seems to like it better.

  • New policy for reduced compile-time at the cost of dispatch speed

  • Support for base events

  • possibility to choose the initial event

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