Flecs v3.2.6

Highlights

• Realtime strategy game Tempest Rising uses Flecs!
• 20% performance increase for add/remove operations when entity already has the component
• Experimental new web tool and JavaScript API for working with the Flecs REST API
• Improved support and CI testing for MinGW targets

Release notes

This version includes the following bugfixes:

• Fix issue with queries and recycled component ids
• Fix JSON serializer issue where serialize_alerts is enabled but module is not imported
• Fix meta bug where member count was ignored if explicit offset was provided (thanks @ZeroErrors!)
• Fix C++ compiler errors when using ecs_map_t macro API
• Fix assert when serializing entity alerts for alert without message template
• Fix recursive cleanup issue for entities with multiple relationships to parent entity
• Fix C++ component hook registration issue when child type was registered before parent

This version includes the following improvements:

• [c] Fix inconsistencies between column index and type index in table API
• [c] Fix naming inconsistencies in table API
• [cpp] Fix inconsistencies between column index and type index in flecs::table API
• [cpp] Fix naming inconsistencies in flecs::table API
• [cpp] Add component::member overload that takes pointer to member (thanks @ZeroErrors!)
• [cpp] Add const to flecs::string::size and flecs::string::length (thanks @yuyoyuppe!)
• [cpp] Add world::scope(const char*) method (thanks @sasichkamega!)
• [meta] Add support for packed structs (thanks @ZeroErrors!)
• [meta] Remove unused size/alignment from EcsMetaType (thanks @ZeroErrors!)
• [rest] Reduce amount of default enabled parameters for REST query endpoint
• [internals] Simplify table data structures
• [internals] Improve organization and naming of source files
• [doc] Add note to FAQ about why (recycled) entity ids can be large
• [doc] Add Tempest Rising to README
• [doc] Add note on empty entities to cleanup order
• [ci] Add msys/mingw builds to CI
• [ci] Fix orphaned tests

Benchmark results
https://github.com/SanderMertens/ecs_benchmark/tree/e66a97d07528be158c1875b7193612904d203ef7

Breaking changes

• Table API changes (#466 (comment))

Known issues:
#844
#765
#714
#620
#478
#314

New Contributors

• @yuyoyuppe made their first contribution in #1019
• @sasichkamega made their first contribution in #1027

Full Changelog: v3.2.5...v3.2.6

Flecs v3.2.5

Highlights

• Manually ran pipelines can now run multithreaded systems!
• Lots of bugfixes and small improvements :)
• The entity inspector in the explorer can now show incoming relationship edges:

Release notes

This version includes the following bugfixes:

• Fix leaking field in AlertInstance component
• Fix leak in query cache with entity filter (union relationships/bitset components/flattened trees)
• Fix issue where ecs_count didn't include prefabs and disabled entities
• Fix issue with using OVERRIDE flag in plecs scripts
• Fix issue with reporting alert severity in JSON serializer
• Fix issue with importing flecs.monitor without flecs.meta
• Fix compilation issues in FreeBSD (thanks @SirLynix!)
• Fix issue where removed argument was not correctly passed by ecs_commit
• Fix issue where ecs_commit wouldn't enter deferred mode while executing the operation
• Fix issue where ecs_iter_t::other_table would get reset for observers after event propagation
• Fix issue with calling .get() on flecs::table/flecs::range from stage
• Fix issue where REST API would return malformed JSON on seralization error (thanks @ZeroErrors!)
• Fix issue where C++ component with the same name as a core entity would be incorrectly registered
• Fix incorrect ifdef that checked for MSVC instead of POSIX (thanks @MilanDierick!)
• Fix issue with change detection for queries with static sources
• Fix issue with change detection and writing to shared terms
• Fix issue in rule engine where variable writes in OR chains weren't treated as conditional
• Fix issue where getting the target of a union relationship could return not alive entity handle
• Fix issue with systems that configure both interval and rate
• Fix memory corruption issues when using nested iterators (thanks @johnse-hypixel!)
• Fix incorrect assert when computed alignment mismatched actual alignment
• Fix issue where world passed to C++ rule iterator wasn't used

This version includes the following improvements:

• [core] Remove ability to get entity id array as field with index 0 (thanks @ZeroErrors!)
• [c] Add ecs_singleton_set_ptr (thanks @darkuranium!)
• [cpp] Add entity_builder::scope method that returns world object scoped to entity
• [cpp] Add flecs::iter::entities method (thanks @ZeroErrors!)
• [cpp] Add world::run_pipeline<T> overload (thanks @ZeroErrors!)
• [cpp] Add world::target method (thanks @ZeroErrors!)
• [cpp] Add world::get_info, remove redundant functions (thanks @ZeroErrors!)
• [pipeline] Add support for multithreading to ecs_run_pipeline (thanks @ZeroErrors!)
• [meta] Add support for member value ranges
• [json] Serialize alerts from children in entity serializer
• [json] Add option to serialize incoming relationship edges for entity
• [alerts] Add retain_period to alert configuration
• [alerts] Make it possible for alerts to change severity based on a condition
• [alerts] Add ability to generate alerts for member values that are out of range
• [alerts] Reduce alert detection interval to 0.5 seconds
• [monitor] Add WorldSummary component
• [expr] Implement parent(), name() and doc_name() functions in expression parser
• [http] Fix unused parameter warning (thanks @MilanDierick!)
• [doc] Fix quickstart example
• [doc] Fix filenames in documentation comments (thanks @ZeroErrors!)
• [doc] Reduce usage of auto in C++ examples
• [doc] Remove redundant functions from C++ examples
• [doc] Update C++ examples that used older/more verbose API methods
• [ci] Use stricter warning settings to compile code warning free
• [ci] Switch asan build to run on Linux, which includes leakage reporting
• [ci] Build code on additional compiler versions
• [cmake] Add FLECS_STRICT flag that enables Werror and stricter warning settings

Benchmark results
https://github.com/SanderMertens/ecs_benchmark/tree/8539a8634bc6cc99a61efd5919ffe8f02c6b3478

Breaking changes

• Passing 0 to ecs_field no longer returns the entity id array (#466 (comment))
• The ecs_lookup_symbol function has an additional recursive argument (#466 (comment))
• The C API convention for naming component id variables has changed (#466 (comment))
• Redundant methods for obtaining world information have been removed (#466 (comment))

Known issues:
#965
#844
#765
#714
#620
#478
#314

New Contributors

• @SirLynix made their first contribution in #998
• @MilanDierick made their first contribution in #996
• @darkuranium made their first contribution in #1007
• @johnse-hypixel made their first contribution in #1012

Full Changelog: v3.2.4...v3.2.5

Flecs v3.2.4

Highlights

• Performance improvements!
  • 25%-80% performance improvement when creating/deleting entity hierarchies
  • 70%-90% performance improvement when reparenting/changing entity names
  • 40% performance improvement for event forwarding
  • 5%-20% performance improvement when iterating cached queries
• A new query feature that allows for nesting terms
• A new alerting addon that monitors graph queries for invalid patterns, with explorer UI:

Release notes

This version includes the following bugfixes:

• Fix issue with calling children() on builtin Wildcard/This entities
• Fix issue in rule engine with anonymous source variables and component terms

This version includes the following improvements:

• [alerts] Implement alert addon
• [cpp] Add world::children method for iterating root entities
• [expr] Add ecs_interpolate_string function
• [expr] Add support for evaluation of dotexpressions on variables (e.g. $foo.x)
• [rules] Add support for nested query terms
• [queries] Reduce overhead of query cache entry by not inlining infrequently used fields
• [queries] Reduce complexity and indirection of query cache data structures
• [systems] Allow rate/interval to be modified with ecs_system_init
• [pipelines] Add support for integration with external tasks systems (thanks @gsnook!)
• [docs] Correct parameter naming of flecs_hashmap_init (thanks @kagetu!)
• [docs] Add section on task systems to system manual
• [core] Allow Exclusive property to be removed from (unused) ids
• [ux] Improve error messages in flecs_bulk_new, ecs_rule_iter
• [internals] Improve naming of functions, constants and add more comments
• [internals] Don't emit unnecessary TableFill/TableEmpty events
• [internals] Don't emit unnecessary TableCreate/TableDelete events
• [internals] Revalidate observer cache in more scenarios (reduces cache invalidation events)
• [internals] Remove redundant calls to defer_begin/defer_end in bootstrap
• [internals] Improve performance of id record creation for pairs
• [internals] Don't inline infrequently used fields in ecs_table_t
• [internals] Remove dead sorting code (thanks @jbarthelmes!)

Benchmark results
https://github.com/SanderMertens/ecs_benchmark/tree/f1a776066fc6d857c9aa1e7c3d7ff59069583750

Known issues:
#969
#965
#844
#765
#714
#620
#478
#314

New Contributors

• @kagetu made their first contribution in #987
• @gsnook made their first contribution in #958

Full Changelog: v3.2.3...v3.2.4

Flecs v3.2.3

Release notes

This version includes the following bugfixes:

• Fix crash when using change detection with queries that don't have $this terms
• Fix issue with serializing large floating point values
• Fix issue with creating user space observer for table events
• Fix error message when using ECS_PRIVATE in ECS_STRUCT
• Add missing emscripten include to app addon source

This version includes the following improvements:

• [c] Change ecs_owns_id from macro to function
• [queries] Reset query match counters after iteration has finished (improves change detection usability in systems)
• [metrics] Add support for metrics that count the number of entities with an id
• [http] Enable blocking for HTTP send call to improve stability of sending large replies
• [docs] Fix broken links in documentation (thanks @MewSoul!)
• [meson] Link with ws2_32 for Windows builds (thanks @randy408!)

Known issues:
#969
#965
#844
#765
#714
#620
#478
#314

Full Changelog: v3.2.2...v3.2.3

Flecs v3.2.2

Highlights

• New entity index data structure which improves performance of create/delete/add/remove by 10-20%
• Replaced hash implementation with wyhash, improving table creation performance by 15-30%
• Graph visualization of queries in the explorer!

Release notes

This version includes the following bugfixes:

• Fix issue where assert would trigger during (component) id deletion
• Fix issue with detecting redeclared variables in flecs script
• Fix incorrect value of EcsTypeKindLast
• Fix issue with creating query on entity that already has an existing query
• Fix potential crash in ecs_iter_fini when using chained iterators
• Fix issue where observer could cause emplace to return invalid pointer
• Fix issue where With pair would assume type of pair target
• Fix inconsistencies in enum constant registration between C and C++ APIs
• Fix issues with symmetric relationships and recycled ids
• Add missing ecs_rule_var_count, ecs_rule_var_name and ecs_rule_var_is_entity functions (thanks @copygirl!)
• Fix inconsistent naming of desc size constants
• Fix issue where id record could get deleted twice during world cleanup
• Fix incorrect JSON serialization of pair ids
• Fix bug in query creation with recycled relationship id
• Add missing imports to monitor module
• Fix assert when iterating rule with 0 source
• Fix possible leak when reassigning system/observer ctx/binding_ctx
• Fix crash in ecs_pipeline_stats_get when obtaining stats for pipeline with one task system

This version includes the following improvements:

• [cpp] Don't compile ECS_FUNC_* marco's for C code (thanks @aganm!)
• [cpp] Add component::constant overload that works with enum classes
• [cpp] Remove entity_view::delta_time function
• [cpp] Change argument of enable_rest to HTTP port
• [c] Remove unnecessary sep variable initialization in ecs_new_from_path_w_sep (thanks @copygirl!)
• [c] Add port member to ecs_app_desc_t
• [http] use non-blocking socket for recv which increases stability for servers with many clients
• [docs] Add note on pipeline switching performance
• [docs] Update outdated cascade example in quickstart
• [docs] Fix incorrect comment for iterable::each (thanks @ZeroErrors!)
• [docs] Fix error in quickstart example
• [json] Improve error handling of JSON iterator serializer
• [rest] Propagate serialization errors to REST endpoints
• [rest] Log errors that happen while replying to REST request to console
• [metrics] Improved logic for deriving metric name from enum constant in untyped_component::metric
• [internals] Implement new entity index data structure
• [internals] Replace hash function with wyhash
• [portability] Emulate POSIX atomics for systems that do not have GNU builtins (thanks @aganm!)
• [portability] Add compiler support for tinycc (thanks @aganm!)
• [ci] Add vs2017 job to CI

Benchmark results
https://github.com/SanderMertens/ecs_benchmark/tree/7bb9d7cf672f0b5991b5faff4f5f8cc5afcd94ef

Breaking changes:

• The entity_view::delta_time method has been removed (#466 (comment))
• The argument of app_builder::enable_rest has changed (#466 (comment))

Known issues:
#969
#965
#844
#765
#714
#620
#478
#314

Full Changelog: v3.2.1...v3.2.2

Flecs v3.2.1

Highlights

• Query iteration improved 20-40% when iterating components
• New addon for recording component values and relationships as metrics
• New FLECS_LOW_FOOTPRINT compiler flag that reduces memory usage

Release notes

This version includes the following bugfixes:

• Fix issue where change detection would not clear when using ecs_query_next_table
• Fix crash where wildcard id record was deleted before matching non-wildcard id record
• Fix issue where during world fini a filter incorrectly decreased the refcount of an id record
• Fix issue with setting This variable to entity for filters
• Fix issue where OnRemove observer wasn't invoked after deferred batched clear
• Fix issue in flecs script where pair target was not looked up correctly
• Fix issue where filter would compute incorrect size for (*, T) pair term

This version includes the following improvements:

• [cpp] Add flecs::world::reset method deletes/recreates a world
• [cpp] Add get/set methods to flecs::world for singleton pairs
• [cpp] Add method to get filter from flecs::rule (thanks @Thinkofname!)
• [cpp] Add flecs::rule::rule_str method
• [cpp] Add flecs::entity_view::path_from method
• [cpp] Allow iterable::set_var to be called for filters
• [cpp] Add flecs::iter::column_index method
• [cpp] Add flecs::table::column_size method
• [c] Add ecs_field_column_index function
• [c] Add ecs_table_get_column_size function
• [queries] Improve performance of trivial query iteration (addresses performance regression in 3.2.0)
• [queries]Implement change detection for flattened tables
• [filters] Return data for OR terms if the type of terms in the OR chain is the same
• [filters] Reuse same sizes array for all results of filter (improves cache locality during iteration)
• [filters] Improve performance of filter creation
• [metrics] Implement metrics addon
• [docs] Add scene management example (thanks @benjitrosch!)
• [docs] Fix typos/grammar issues in relationships doc (thanks @oznogon!)
• [docs] Fix outdated docs for ecs_filter_iter
• [docs] Fix outdated docs for ecs_bulk_new_w_id
• [docs] Fix link to FAQ in readme
• [cmake] Update version number to 3.2 (thanks @podsvirov!)
• [internals] Reduce overhead of tables that don't use bitsets/union relationships/flattening
• [internals] Add FLECS_LOW_FOOTPRINT compiler flag for reduced memory utilization

Breaking changes:

• A when_changed argument has been added to ecs_query_populate (#466 (comment))

Known issues:
#844
#765
#714
#620
#478
#314
#951

New Contributors

• @podsvirov made their first contribution in #952
• @oznogon made their first contribution in #956

Full Changelog: v3.2.0...v3.2.1

Flecs v3.2.0

Release announcement

Flecs 3.2 is out!

Release notes

This version includes the following bugfixes:

• Fix issue with batched set commands and emitting OnSet events
• Fix issue where bitset iteration index could go out of bounds
• Fix issue where ecs_get_target would try inheritance for relationship with DontInherit
• Fix error in custom_phases_no_builtin C++ example
• Fix issue in JSON serializer with large string values
• Fix issue in JSON serializer with entity ids at offset
• Fix potential crash in ecs_get_target_id_for
• Correctly set ecs_iter_t::offset in component hooks
• Fix issue with suspending deferred mode
• Fix issue in cursor API with double assignment after dotmember
• Fix issue in script parser with binary operator followed by component assignment
• Fix issue with vectors in JSON serializer
• Fix issue where comments inside value blocks didn't work correctly in Flecs script
• Fix issue with setting name string that overlaps with existing name in deferred mode
• Add missing implementation of ecs_rule_get_filter
• Fix issue with command ordering when setting name after reparenting
• Fix compilation issue with new version of emcc
• Fix issue where event for multiple ids triggered for wrong entity
• Fix issue where event for multiple ids triggered multiple times for same observer
• Fix issue where id in table was not updated after calling ecs_set_entity_generation
• Fix issue that prevents using ecs_get_target_for_id from stage
• Fix issue with component registration across binaries in multithreaded applications
• Fix memory leak in HTTP server
• Fix issue with importing C module in multiple worlds
• Fix component registration issue with binaries compiled by different compilers
• Fix issue with component registration of world::vector
• Correct for overshoot value when returning delta_system_time for interval systems

This version includes the following improvements:

• [c] Add missing const qualifiers to query functions
• [c] Add missing const qualifier to ecs_id_in_use
• [c] Add ecs_get_parent convenience function
• [cpp] Add flecs::rule::move method
• [cpp] Don't assert when creating invalid rule, add flecs::rule::is_valid method
• [cpp] Add flecs::entity_builder::set_alias method
• [cpp] Add API for singleton pairs to flecs::world
• [cpp] Ensure world is cleaned up when app().run() returns
• [rules] Rule engine refactor
• [rules] Improved support for Not, Optional, Or operators
• [rules] Added support for fuzzy name matching
• [rules] Added support for dependent terms
• [rules] Added a query profiler for analyzing term performance
• [rules] Many improvements to performance, VM, data structures, runtime
• [rules] Add option to auto-match unresolved identifiers at query creation time by name
• [rules] Add support for using any (_) variable as term source
• [rules] Add support for queries that start with Not/Optional terms
• [rules] Add support for transitive queries with any (_) target
• [rules] Add support for transitive queries with self modifier for target
• [rules] Allow for usage of relationships other than IsA for component inheritance
• [rules] Add support for parsing variable values from argument string
• [rules] Add performance optimization for trivial rule queries
• [filters] Default to InOutNone if the term type is not known beforehand
• [filters] Change interface for Or operator to allow for neighboring Or terms
• [queries] Improve query sorting performance
• [queries] Add assert on invalid order_by component id
• [core] Implement relationship flattening
• [core] Replace all remaining occurrences of ecs_vector_t with ecs_vec_t
• [core] Cache (ChildOf, *) id record on world for improved performance
• [core] Cache (Identifier, Name) id record on world for improved performance
• [core] Add AlwaysOverride component property
• [core] Ensure children of a prefab are also tagged as prefabs
• [core] Add stricter check on adding properties to components that are already in use
• [meta] Add conversion to cursor API from bool to int
• [meta] Throw less confusing error in cursor API when assigning out of bounds element/member
• [rest] Add validity checks on offset/limit parameters
• [rest] Add functions to call REST API from C
• [http] Implement request caching (replaces caching mechanism of REST API)
• [doc] Fix conflicting declaration in quickstart example
• [doc] Fix outdated code example in systems manual
• [doc] Add build instructions to quickstart for cmake and bake
• [doc] Fix incorrect link in README to prefab documentation
• [doc] Add parent(), target_for() to query section of relationship manual
• [doc] Expand explorer section of REST manual with query examples
• [script] Add experimental support for loading managed scripts
• [script] Add experimental support for assemblies
• [script] Allow for setting nested members in expression
• [script] Add support for deriving variable name from assigned member
• [script] Add support for adding variables as components
• [script] Make EXPR/META addon mandatory when using script addon
• [script] Add support for using foo.* syntax
• [script] Add support for module foo syntax
• [script] Add Flecs script tutorial
• [script] Add support for assigning singletons with $ :- Component{}
• [log] Add ecs_log_get_level

Breaking Changes

• The interface for creating queries with Or operators has changed (#466 (comment))
• The ecs_vector_t type has been removed from the source and replaced with ecs_vec_t (#466 (comment))

Known issues

#844
#765
#714
#620
#478
#314

New Contributors

• @SaadiqDaniels made their first contribution in #933
• @icolwell made their first contribution in #937
• @benjitrosch made their first contribution in #944

Full Changelog: v3.1.5...v3.2.0

Flecs v3.1.5

Highlights

• A big upgrade to the reflection framework which can now serialize/deserialize custom (including STL) types!
• New functions to serialize & deserialize a world to & from JSON
• Improved performance of iterating queries with tag fields (+30-50%)
• Improved performance of table creation in apps with lots of cached queries (+70-90%)
• Improved performance of notifying multiple observers for the same event (+20-30%)

Release notes

This version includes the following bugfixes:

• Fix issue where symmetric relationship would be cleaned up before its observer
• Fix issue in debug mode where entity generation check could use wrong index in dense array
• Fix issue where on_set hook was not called before observers during command batching
• Changed incorrect return type of ecs_id_is_tag to bool
• Ensure destructor is called on moved away from value in command queue
• Fix memory leaks when using a global flecs::world object
• Ensure destructor is called on moved away from column when merging tables
• Fix lambda compilation issue when using Visual Studio 2017

This version includes the following improvements:

• [core] Allow for ecs_ensure to be called from stage
• [core] Add Traversable property to allow for relationships that are acyclic but not traversable
• [core] Only apply DontInherit property to IsA traversal
• [meta] Serialization & deserialization support for opaque types
• [meta] Add methods for deserializing values & entities to C++ API
• [json] Add option to JSON serializer to serialize all contents of a matched table
• [json] Add functions for serializing/deserializing world to/from JSON
• [observers] Improve performance of invoking multiple observers for the same event
• [queries] Improve detection and handling of query terms without data
• [cpp] Remove redundant world argument from flecs::entity constructor in id::second()
• [cpp] Add begin/end methods to flecs::type so it can be iterated
• [cpp] Add entity::view method for safe upcast from staged flecs::entity object
• [cpp] Automatically disable enum reflection for compilers that don't support it
• [docs] Improve documentation of get_mut
• [docs] Rewrite of the FAQ
• [docs] Add query example for singletons, add singleton section to quickstart
• [ux] Add assert when not using stage when creating iterator in multi threaded world
• [internals] Use observers for notifying queries of new tables
• [internals] Improve performance of ecs_bulk_init by using faster function to update entity index
• [internals] Implement small utility API for parsing JSON strings

Breaking Changes:

• Inconsistencies in the naming of JSON deserialization functions have been fixed (#466 (comment))
• The behavior of the Acyclic property has been split up into an Acyclic and Traversable property (#466 (comment))

Known issues:
#844
#765
#714
#620
#478
#314

New Contributors

• @BeanCheeseBurrito made their first contribution in #923
• @Thinkofname made their first contribution in #928

Full Changelog: v3.1.4...v3.1.5

Flecs v3.1.4

Highlights

• Performance improvements for many core ECS operations! 🎉 (see below)
• A new benchmark suite with more than 100 tests: https://github.com/SanderMertens/ecs_benchmark
• Changes made to an existing component with a deferred get_mut are now immediately visible to systems & other get_mut calls (#466 (comment))

Performance improved in this release for 116 in a total of 120 benchmarks! Here are a few of the most significant improvements between v3.0.0 and v3.1.4 (which also includes improvements from command batching & the observer cache):

Benchmark	v3.0.0	v3.1.4	Difference
has_id	8.92ns	4.38ns	+50.90%
get_id	7.18ns	3.69ns	+48.61%
get_mut_id	12.22ns	7.35ns	+39.85%
set_id	29.13ns	11.85ns	+59.32%
add_remove_1_tag	20.43ns	17.63ns	+13.71%
add_remove_cmd_16_tags	40.40ns	17.55ns	+56.56% (command batching)
get_mut_cmd_16	47.17ns	18.65ns	+60.46% (command batching)
create_delete_tree_depth_10	19.27us	8.24us	+57.25%
emit_propagate_depth_10	1.52us	194.33ns	+87.25% (observer cache)
query_iter_16_tags_4_terms	56.39ns	26.15ns	+53.63%

Release notes

This version includes the following bugfixes:

• Ensure HAVE_EXECINFO is defined on all platforms
• Fix compilation issue on clang 16 (thanks @gorilux!)
• Add missing flecs_cpp.c to the meson build file
• Fix issue where non-instanced query with multiple traversal terms did not match entities
• Fix broken links in documentation
• Remove <strong></strong> from documentation markdown headers
• Fix issue where atomic id generation was used without threading
• Fix issue where flecs::ref would store stage instead of world
• Fix assert in observer cache after deleting parent with relationship to child
• Fix issue with passing string to ecs_set_name that overlaps with current name
• Fix compile error when passing existing object to set<R, T>
• Fix memory corruption when using ecs_bulk_init with existing table
• Fix command batching issue with adding ChildOf pair while removing name

This version includes the following improvements:

• [core] Require entities to be alive for ECS operations
• [core] Deferred ecs_get_mut_id now returns reference to actual component if it exists (thanks @dmlary!)
• [c] Add matching *_DECLARE convenience macro's for each *_DEFINE macro
• [cpp] Add world::get_ref
• [docs] Lots of small improvements to documentation (thanks @copygirl!)
• [docs] Move build instructions from README to Quickstart
• [docs] Improve build instructions for gcc/clang on Windows
• [ux] Add example for entity::emplace
• [internals] Faster map implementation that no longer stores a variable size payload
• [internals] Use array vs. sparse set to lookup id records with low ids
• [internals] Replace usage of ecs_vector_t in sparse set with faster ecs_vec_t
• [internals] Add new/faster sparse set operations that assume id is alive
• [internals] Cleanup sparse set API
• [internals] Replace code of ecs_has_id with faster implementation
• [internals] Remove redundant code from table graph operations
• [internals] Improve performance of defer/suspend mechanism
• [internals] Improve performance of pipelines queries by adding self flag to System term

Breaking Changes:

• Entities now must be alive before using with ECS operations (#466 (comment))
• Deferred get_mut now returns pointer to existing component (#466 (comment))

Known issues:
#844
#765
#714
#620
#478
#314

New Contributors

• @copygirl made their first contribution in #902
• @gorilux made their first contribution in #906
• @dmlary made their first contribution in #908

Full Changelog: v3.1.3...v3.1.4

Flecs v3.1.3

Highlights

• New documentation website!
• Query rematching performance improvements

Release notes

This version includes the following bugfixes:

• Fix issues with looking up numerical ids from scope (e.g. foo::bar::100)
• Fix issue where reachable cache invalidation would not iterate all ids
• Fix issue with parsing entity path that can't fit in 32bit int
• Fix issue where filter with self term is created before id
• Fix issue where id records were incorrectly deleted for ecs_remove_all/ecs_delete_with
• Fix issue with adding ChildOf pair and deferred ecs_entity_init
• Fix issues with updating EcTableHasObserved flag (fixes reachable cache asserts)
• Fix issue where id record could not get cleaned up correctly (fixes reachable cache asserts)
• Add move hook to Pipeline component (fixes segfault when using multiple pipelines)

This version includes the following improvements:

• [entities] Use empty separator string to prevent tokenization of name in ecs_entity_init
• [cpp] Add const to query class methods
• [cpp] Add const to iterable class methods
• [cpp] Add emplace_override for pairs
• [queries] Prevent query rematching from happening more than once per query/frame
• [pipelines] Prevent adding empty operation at end of schedule
• [table] Support calling ecs_table_get from stage
• [units] Add units for hyperlinks, images and files
• [units] Add Length::Pixel unit
• [docs] Add doxygen headers to source and include files
• [docs] Add edcs_get_depth, entity_view::depth, ecs_table_get_depth, table::depth functions
• [docs] Add doxygen documentation
• [docs] Replace old flecs.dev site with doxygen generated one
• [docs] Remove dead links to docsforge pages
• [docs] Add instructions for how to fix compilation errors related to time/socket functions
• [ux] Improved C/C++ APIs for working with tables
• [ux] Remove redundant tracing when component is reregistered
• [ux] Throw assert when trying to delete entity/component that is still queried for
• [internals] Move code out of query iterator in preparation of union/bitset support for filters
• [internals] Remove redundant relationship traversal call from table edge creation code

Known issues:
#844
#765
#714
#620
#478
#314