EnTT v4.0.0 changelog preview

[skypjack]

Changelog

• config:

  • ENTT_CONSTEXPR is no longer available
  • ENTT_NOEXCEPTION renamed into ENTT_NO_EXCEPTION
  • Add ENTT_USE_STL (mainly for testing purposes)
  • Support injecting configuration via optional <entt/ext/config.h> header 👈✍️

• core:

  • entt::identity is no longer available
  • entt::popcount is no longer available
  • entt::has_single_bit is no longer available
  • entt::next_power_of_two is no longer available
  • entt::type_identity is no longer available
  • entt::to_address is no longer available
  • Added concept enum_bitmask
  • Added concept cvref_unqualified
  • Refine type_info definition to favor concepts over sfinae
  • Invoking as_ref on an empty any returns and empty any
  • Update type_id definitions for the best
  • member_class is conditional_t friendly

• entity

  • View-to-view conversion support for all view types
  • Added concept entt_like
  • Refine component_traits definition to favor concepts over sfinae
  • Perf improvements on storage destruction for trivially destructible types
  • Perf improvements on component destruction for trivially destructible types
  • Perf improvements when shrinking storage types
  • Reintroduce storage support to arguments for empty types

• meta:

  • name returns an std::string_view for all meta objects
  • Added the new meta_base object
  • base() returns meta_base objects in all cases
  • Added concept meta_policy
  • Support name clashing between meta data/functions and types
  • Refine is_meta_pointer_like definition to favor concepts over sfinae
  • Copying a meta_any that wraps a non-copyable type returns an invalid meta_any
  • Added a non-const overload of meta_any::operator*
  • Pointers are no longer pointer-like types
  • meta_any supports all dereferenceable types, i.e. optionals (constness is also guaranteed)
  • Meta containers are automatically detected, meta container traits are used to opt-out
  • Multi meta type support for the same C++ type 👈😲
  • meta_types can be injected into meta_anys to rebind overloaded types as needed
  • meta_data::arity replaced with meta_data::set_arity and meta_data::get_arity
  • meta_data::arg replaced with meta_data::set_arg and meta_data::get_arg
  • meta_ctx_arg_t and meta_ctx_arg are exported via fwd.hpp too
  • meta_type::id renamed to meta_type::alias
  • meta_data::set supports additional arguments upon invocation (useful for custom setters)
  • meta_data::get supports additional arguments upon invocation (useful for custom getters)

• signal:

  • Support enqueueing the same event type in a dispatcher from listeners
  • Update dispatcher trigger function to only accept already constructed events

• stl:

  • A brand new submodule, mainly designed for internal purposes
  • Custom STL injection support 👈🥳

• tools:

  • Make davey visit meta base types
  • Conditionally include <imgui> in davey.hpp
  • Improve a little the testbed for davey, but it's still a work in progress

Build system

• C++20 is now required to use EnTT
• Minimum cmake version updated to 3.28
• Minimum doxygen version updated to 1.14

Natvis support

All natvis files have been updated where necessary.

Breaking changes

• config:

  • ENTT_CONSTEXPR is no longer available, use constexpr instead
  • ENTT_NOEXCEPTION renamed into ENTT_NO_EXCEPTION

• core:

  • entt::identity is no longer available, use std::identity instead
  • entt::popcount is no longer available, use std::popcount instead
  • entt::has_single_bit is no longer available, use std::has_single_bit instead
  • entt::next_power_of_two is no longer available, use std::bit_ceil instead
  • entt::type_identity is no longer available, use std::type_identity instead
  • entt::to_address is no longer available, use std::to_address instead
  • type_info no longer matches sfinae-based specialization, use concepts instead

• entity:

  • component_traits no longer matches sfinae-based specializations, use concepts instead

• meta:

  • base() returns meta_base objects instead of meta_types
  • is_meta_pointer_like no longer matches sfinae-based specialization, use concepts instead
  • Pointers are no longer pointer-.like types, check the right trait as needed
  • Meta containers are automatically detected, meta container traits are used to opt-out
  • meta_data::arity was removed, use meta_data::set_arity and meta_data::get_arity instead
  • meta_data::arg was removed, use meta_data::set_arg and meta_data::get_arg instead
  • meta_type::id no longer exists, use meta_type::alias instead
  • meta_type::invoke overload for meta_any * is not supported anymore
  • meta_func::invoke overload for meta_any * is not supported anymore
  • meta_type::construct overload for meta_any * is not supported anymore

• signal:

  • The trigger function of a dispatcher only accepts already constructed events now

Any other business

The library requires C++20-ish and works fine on all major platforms, consoles, whatever.
All previously deprecated functions and classes have been removed.
The clang-format configuration has been updated to match with the coding style.
The documentation is up-to-date and the library is battle-tested with 100% coverage as usual.