Changelog

• config:

  • ENTT_FAIL(msg) as an alias of ENTT_ASSERT(false, msg)

• core:

  • is_equality_comparable also detects C-style arrays
  • Added value_list_index[_v], value_list_unique[_t], value_list_contains[_v] and value_list_diff[_t]
  • std::tuple traits specialization for entt::type_list and entt::value_list

• entity:

  • All group types are copyable and movable
  • View filter storage classes are now available (see ::storage)
  • Group filter storage classes are now available (see ::storage)
  • Propagate the allocator to the registry context
  • sigh_helper utility to simplify connecting multiple listeners to a registry
  • Public basic_sparse_set<...>::traits_type type member
  • Public basic_storage<...>::traits_type type member
  • Public basic_registry<...>::traits_type type member
  • component_traits treat void properly as any other component type
  • Split entt_traits and basic_entt_traits to simplify specializing the former
  • Make entity_mask and version_mask available through entt_traits
  • Add entt_traits::base_type for the final user (not used internally)
  • Make basic_registry work properly with void component type
  • Handles discard their entities on destruction
  • Improved removing/erasing elements when a sigh_mixin is attached to a storage
  • Added internal, opaque data function to sparse set iterators
  • Additional internal virtual clear_all function available in the basic_sparse_set<...> class
  • Improved performance of sparse set remove, erase and clear functions
  • Improved performance of registry remove, erase, clear and destroy functions
  • deletion_policy is now publicly available via entity/fwd.hpp
  • Added basic_sparse_set<...>::contiguous function
  • extended_storage_iterator::base makes the underlying iterator available
  • extended_view_iterator::base makes the underlying iterator available
  • extended_group_iterator::base makes the underlying iterator available
  • Added a specialization of basic_storage when the value type is also the entity type (entity storage)
  • Entities have their own storage in a registry and it's accessible as storage<entity_type>()
  • Sigh mixin also supports entity storage types (to send signals on entity creation/destruction/update)
  • Exclude-only like views are also supported because of the entity storage
  • added basic_entt_traits::next returns the next valid version of an identifier
  • Refined transparent aggregate support for storage types
  • Deprecated the following functions in the registry class:
    • basic_registry<...>::size() (use .storage<E>().size() instead)
    • basic_registry<...>::alive() (use .storage<E>().in_use() instead)
    • basic_registry<...>::reserve(cap) (use .storage<E>().reserve(cap) instead)
    • basic_registry<...>::capacity() (use .storage<E>().capacity() instead)
    • basic_registry<...>::empty() (use .storage<E>().in_use() instead)
    • basic_registry<...>::data() (use .storage<E>().data() instead)
    • basic_registry<...>::released() (use .storage<E>().in_use() and .storage<E>().size() instead)
    • basic_registry<...>::release(args...) (use .storage<E>().erase(args) and .storage<E>().bump(entt) instead)
    • basic_registry<...>::assign(args...) (use .storage<Entity>().push(first, last) and .storage<Entity>().in_use(len) instead)
    • basic_registry<...>::each(args...) (use .storage<Entity>().each() instead)
  • basic_sparse_set<...>::bump returns the version in use
  • basic_storage<...>::insert returns an iterator to the range of inserted elements
  • Storage based groups fully support multiple storage of the same type now
  • Huge internal rework to reduce the dependencies between the registry and the group classes/handlers
  • All group types have a .handle() function to return a reference to the leading storage
  • basic_registry<...>::group is no longer [[nodiscard]]
  • Configurable mask type for basic_observer
  • Allocator support for basic_observer
  • get_t, owned_t and exclude_t are (constexpr constructible) types now rather than aliases of type_list
  • basic_storage uses allocator_traits::destroy now rather than std::destroy_at (to allow specializations if needed)
  • Make basic_registry<...>::storage_for_type<...> available to the final user
  • basic_view<..>::operator bool returns true only for fully initialized views
  • Uninitialized views behave correctly in all circumstances, returning the expected result on each call
  • Views support swapping their storage or setting them lazily
  • View packs fully support empty views finally
  • basic_registry<...> doesn't instantiate temporary static storage on const function anymore
  • on_construct/on_update/on_destroy of basic_registry<...> also support named pools
  • Added a reverse each function (reach, worst name ever) to all storage classes
  • basic_registry<...>::erase_if to conditionally erase elements from their storage
  • Deprecated the following functions in the snapshot classes:
    • entities() (use get<Entity>() instead)
    • component<...>(...) (use get<T>(...) instead)
    • shrink, no longer required
  • General purpose ::get<T>(...) function for snapshot classes that works with storage types
  • Runtime pools support for snapshot classes (see ::get<T>(...) for further details)
  • Drop multi-type archive function requirement for snapshot classes

• graph:

  • Allocator type propagates to the graph type returned by flow::graph() calls

• locator:

  • Support for opaque structures

• meta:

  • It's now possible to update the value of a meta property at any time (non-const meta_any ref)
  • Full support to meta member functions for primitive types
  • operator==/!= for meta_handle
  • operator==/!= for meta_data
  • operator==/!= for meta_prop
  • operator==/!= for meta_func

• process:

  • Introduced basic_scheduler with default delta type for common cases
  • Turn scheduler into an alias for basic_scheduler<std::uint32_t>

• signal:

  • Added delegate::target to get a pointer to the stored callable function
  • Refined transparent aggregate support for the dispatcher class
  • delegate also supports functions that skip first elements (on second attempt only)
  • Allow disconnecting listeners during iterations over the sigh class

Build system

• Bump IWYU version to 0.19
• Bump CMake version to 3.15.7
• Enable documentation diagnostic for Clang
• Increase CI warning level to /W1 on Windows
• Add GCC11 to the list of compilers directly checked by the CI

Any other business

• Suppress a few warnings due to unused variables in corner cases
• More [[nodiscard]] where it makes sense (i.e. any_cast or meta_type::from_void)
• Better allocator support with additional runtime checks for corner cases

Natvis support

All natvis files have been updated where necessary.

Breaking changes

• entity:

  • ignore_as_empty_v doesn't exist anymore, use component_traits<...>::page_size instead
  • entt_traits::reserved is no longer available, combine entity_mask and version_mask instead
  • basic_sparse_set<...>::swap_at is now a protected function, override swap_or_move as needed instead
  • basic_sparse_set<...>::move_element doesn't exist anymore, use swap_or_move instead (with checks on to if needed)
  • sigh_storage_mixin was renamed into sigh_mixin
  • basic_sparse_set<...>::emplace was renamed to push
  • basic_sparse_set<...>::insert was renamed to push
  • basic_sparse_set<...>::get was renamed to value
  • basic_sparse_set<...>::sort was renamed to sort_as
  • basic_group<...>::sort (no callback overload) was renamed to sort_as
  • basic_registry<...>::base_type was renamed to common_type
  • basic_group<...>::base_type was renamed to common_type
  • runtime_view<...>::base_type was renamed to common_type
  • basic_view<...>::base_type was renamed to common_type
  • Nested groups are no longer supported (the pain is not worth the gain)
  • basic_view<...>::storage<...>() returns a (possibly null) pointer rather than a reference
  • basic_view<...>::handle() returns a (possibly null) pointer rather than a reference
  • basic_group<...>::storage<...>() returns a (possibly null) pointer rather than a reference
  • basic_view<...>::refresh() is a self-contained, non-const function that changes the view in-place
  • basic_view<...>::use<T>() is a self-contained, non-const function that changes the view in-place

• process:

  • scheduler no longer requires a template parameter, use basic_scheduler if std::uint32_t isn't a good enough delta type

• signal:

  • disconnect by reference is no longer available on the sink class, use the overload that accepts a pointer instead
  • sink<...>::before is no longer supported, no alternative provided

Any other business

The documentation is up-to-date and the library is battle-tested with 100% coverage as usual.
I started a long term process to reduce the number of instantiations and also speed up the compilation.
This release contains many changes and great improvements in this regard. Still a work in progress though.