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observer: so long, and thanks for all the fish

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This commit is contained in:
Michele Caini
2024-10-25 13:01:06 +02:00
parent e13c87a447
commit 15b9871205
8 changed files with 0 additions and 817 deletions
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1
CMakeLists.txt
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@@ -145,7 +145,6 @@ if(ENTT_INCLUDE_HEADERS)
$<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/handle.hpp>
$<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/mixin.hpp>
$<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/helper.hpp>
$<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/observer.hpp>
$<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/organizer.hpp>
$<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/ranges.hpp>
$<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/registry.hpp>

1
entt.imp
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@@ -20,7 +20,6 @@
{ "include": [ "@[\"<].*/entity/fwd\\.hpp[\">]", "private", "<entt/entity/handle.hpp>", "public" ] },
{ "include": [ "@[\"<].*/entity/fwd\\.hpp[\">]", "private", "<entt/entity/helper.hpp>", "public" ] },
{ "include": [ "@[\"<].*/entity/fwd\\.hpp[\">]", "private", "<entt/entity/mixin.hpp>", "public" ] },
{ "include": [ "@[\"<].*/entity/fwd\\.hpp[\">]", "private", "<entt/entity/observer.hpp>", "public" ] },
{ "include": [ "@[\"<].*/entity/fwd\\.hpp[\">]", "private", "<entt/entity/organizer.hpp>", "public" ] },
{ "include": [ "@[\"<].*/entity/fwd\\.hpp[\">]", "private", "<entt/entity/ranges.hpp>", "public" ] },
{ "include": [ "@[\"<].*/entity/fwd\\.hpp[\">]", "private", "<entt/entity/registry.hpp>", "public" ] },

6
src/entt/entity/fwd.hpp
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@@ -47,9 +47,6 @@ class basic_runtime_view;
template<typename, typename, typename>
class basic_group;
template<typename, typename = std::allocator<void>>
class basic_observer;
template<typename>
class basic_organizer;
@@ -92,9 +89,6 @@ using reactive_mixin = basic_reactive_mixin<Type, basic_registry<typename Type::
/*! @brief Alias declaration for the most common use case. */
using registry = basic_registry<>;
/*! @brief Alias declaration for the most common use case. */
using observer = basic_observer<registry>;
/*! @brief Alias declaration for the most common use case. */
using organizer = basic_organizer<registry>;

438
src/entt/entity/observer.hpp
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@@ -1,438 +0,0 @@
#ifndef ENTT_ENTITY_OBSERVER_HPP
#define ENTT_ENTITY_OBSERVER_HPP
#include <cstddef>
#include <cstdint>
#include <limits>
#include <type_traits>
#include <utility>
#include "../core/type_traits.hpp"
#include "fwd.hpp"
#include "storage.hpp"
namespace entt {
/*! @brief Grouping matcher. */
template<typename...>
struct matcher {};
/**
* @brief Collector.
*
* Primary template isn't defined on purpose. All the specializations give a
* compile-time error, but for a few reasonable cases.
*/
template<typename...>
struct basic_collector;
/**
* @brief Collector.
*
* A collector contains a set of rules (literally, matchers) to use to track
* entities.<br/>
* Its main purpose is to generate a descriptor that allows an observer to know
* how to connect to a registry.
*/
template<>
struct basic_collector<> {
/**
* @brief Adds a grouping matcher to the collector.
* @tparam AllOf Types of elements tracked by the matcher.
* @tparam NoneOf Types of elements used to filter out entities.
* @return The updated collector.
*/
template<typename... AllOf, typename... NoneOf>
static constexpr auto group(exclude_t<NoneOf...> = exclude_t{}) noexcept {
return basic_collector<matcher<type_list<>, type_list<>, type_list<NoneOf...>, AllOf...>>{};
}
/**
* @brief Adds an observing matcher to the collector.
* @tparam AnyOf Type of element for which changes should be detected.
* @return The updated collector.
*/
template<typename AnyOf>
static constexpr auto update() noexcept {
return basic_collector<matcher<type_list<>, type_list<>, AnyOf>>{};
}
};
/**
* @brief Collector.
* @copydetails basic_collector<>
* @tparam Reject Untracked types used to filter out entities.
* @tparam Require Untracked types required by the matcher.
* @tparam Rule Specific details of the current matcher.
* @tparam Other Other matchers.
*/
template<typename... Reject, typename... Require, typename... Rule, typename... Other>
struct [[deprecated("use reactive mixin instead")]] basic_collector<matcher<type_list<Reject...>, type_list<Require...>, Rule...>, Other...> {
/*! @brief Current matcher. */
using current_type = matcher<type_list<Reject...>, type_list<Require...>, Rule...>;
/**
* @brief Adds a grouping matcher to the collector.
* @tparam AllOf Types of elements tracked by the matcher.
* @tparam NoneOf Types of elements used to filter out entities.
* @return The updated collector.
*/
template<typename... AllOf, typename... NoneOf>
static constexpr auto group(exclude_t<NoneOf...> = exclude_t{}) noexcept {
return basic_collector<matcher<type_list<>, type_list<>, type_list<NoneOf...>, AllOf...>, current_type, Other...>{};
}
/**
* @brief Adds an observing matcher to the collector.
* @tparam AnyOf Type of element for which changes should be detected.
* @return The updated collector.
*/
template<typename AnyOf>
static constexpr auto update() noexcept {
return basic_collector<matcher<type_list<>, type_list<>, AnyOf>, current_type, Other...>{};
}
/**
* @brief Updates the filter of the last added matcher.
* @tparam AllOf Types of elements required by the matcher.
* @tparam NoneOf Types of elements used to filter out entities.
* @return The updated collector.
*/
template<typename... AllOf, typename... NoneOf>
static constexpr auto where(exclude_t<NoneOf...> = exclude_t{}) noexcept {
using extended_type = matcher<type_list<Reject..., NoneOf...>, type_list<Require..., AllOf...>, Rule...>;
return basic_collector<extended_type, Other...>{};
}
};
/*! @brief Variable template used to ease the definition of collectors. */
inline constexpr basic_collector<> collector{};
/**
* @brief Observer.
*
* An observer returns all the entities and only the entities that fit the
* requirements of at least one matcher. Moreover, it's guaranteed that the
* entity list is tightly packed in memory for fast iterations.<br/>
* In general, observers don't stay true to the order of any set of elements.
*
* Observers work mainly with two types of matchers, provided through a
* collector:
*
* * Observing matcher: an observer will return at least all the living entities
* for which one or more of the given elements have been updated and not yet
* destroyed.
* * Grouping matcher: an observer will return at least all the living entities
* that would have entered the given group if it existed and that would have
* not yet left it.
*
* If an entity respects the requirements of multiple matchers, it will be
* returned once and only once by the observer in any case.
*
* Matchers support also filtering by means of a _where_ clause that accepts
* both a list of types and an exclusion list.<br/>
* Whenever a matcher finds that an entity matches its requirements, the
* condition of the filter is verified before to register the entity itself.
* Moreover, a registered entity isn't returned by the observer if the condition
* set by the filter is broken in the meantime.
*
* @b Important
*
* Iterators aren't invalidated if:
*
* * New instances of the given elements are created and assigned to entities.
* * The entity currently pointed is modified (as an example, if one of the
* given elements is removed from the entity to which the iterator points).
* * The entity currently pointed is destroyed.
*
* In all the other cases, modifying the pools of the given elements in any way
* invalidates all the iterators.
*
* @warning
* Lifetime of an observer doesn't necessarily have to overcome that of the
* registry to which it is connected. However, the observer must be disconnected
* from the registry before being destroyed to avoid crashes due to dangling
* pointers.
*
* @tparam Registry Basic registry type.
* @tparam Allocator Type of allocator used to manage memory and elements.
*/
template<typename Registry, typename Allocator>
class basic_observer {
using mask_type = std::uint64_t;
using storage_type = basic_storage<mask_type, typename Registry::entity_type, typename std::allocator_traits<Allocator>::template rebind_alloc<mask_type>>;
template<std::size_t Index>
static void discard_if(storage_type &storage, Registry &, const typename Registry::entity_type entt) {
if(storage.contains(entt) && !(storage.get(entt) &= (~(1 << Index)))) {
storage.erase(entt);
}
}
template<typename>
struct matcher_handler;
template<typename... Reject, typename... Require, typename AnyOf>
struct matcher_handler<matcher<type_list<Reject...>, type_list<Require...>, AnyOf>> {
template<std::size_t Index>
static void maybe_valid_if(storage_type &storage, Registry &parent, const typename Registry::entity_type entt) {
if(parent.template all_of<Require...>(entt) && !parent.template any_of<Reject...>(entt)) {
if(!storage.contains(entt)) {
storage.emplace(entt);
}
storage.get(entt) |= (1 << Index);
}
}
template<std::size_t Index>
static void connect(storage_type &storage, Registry &parent) {
(parent.template on_destroy<Require>().template connect<&discard_if<Index>>(storage), ...);
(parent.template on_construct<Reject>().template connect<&discard_if<Index>>(storage), ...);
parent.template on_update<AnyOf>().template connect<&maybe_valid_if<Index>>(storage);
parent.template on_destroy<AnyOf>().template connect<&discard_if<Index>>(storage);
}
static void disconnect(storage_type &storage, Registry &parent) {
(parent.template on_destroy<Require>().disconnect(&storage), ...);
(parent.template on_construct<Reject>().disconnect(&storage), ...);
parent.template on_update<AnyOf>().disconnect(&storage);
parent.template on_destroy<AnyOf>().disconnect(&storage);
}
};
template<typename... Reject, typename... Require, typename... NoneOf, typename... AllOf>
struct matcher_handler<matcher<type_list<Reject...>, type_list<Require...>, type_list<NoneOf...>, AllOf...>> {
template<std::size_t Index, typename... Ignore>
static void maybe_valid_if(storage_type &storage, Registry &parent, const typename Registry::entity_type entt) {
bool guard{};
if constexpr(sizeof...(Ignore) == 0) {
guard = parent.template all_of<AllOf..., Require...>(entt) && !parent.template any_of<NoneOf..., Reject...>(entt);
} else {
guard = parent.template all_of<AllOf..., Require...>(entt) && ((std::is_same_v<Ignore..., NoneOf> || !parent.template any_of<NoneOf>(entt)) && ...) && !parent.template any_of<Reject...>(entt);
}
if(guard) {
if(!storage.contains(entt)) {
storage.emplace(entt);
}
storage.get(entt) |= (1 << Index);
}
}
template<std::size_t Index>
static void connect(storage_type &storage, Registry &parent) {
(parent.template on_destroy<Require>().template connect<&discard_if<Index>>(storage), ...);
(parent.template on_construct<Reject>().template connect<&discard_if<Index>>(storage), ...);
(parent.template on_construct<AllOf>().template connect<&maybe_valid_if<Index>>(storage), ...);
(parent.template on_destroy<NoneOf>().template connect<&maybe_valid_if<Index, NoneOf>>(storage), ...);
(parent.template on_destroy<AllOf>().template connect<&discard_if<Index>>(storage), ...);
(parent.template on_construct<NoneOf>().template connect<&discard_if<Index>>(storage), ...);
}
static void disconnect(storage_type &storage, Registry &parent) {
(parent.template on_destroy<Require>().disconnect(&storage), ...);
(parent.template on_construct<Reject>().disconnect(&storage), ...);
(parent.template on_construct<AllOf>().disconnect(&storage), ...);
(parent.template on_destroy<NoneOf>().disconnect(&storage), ...);
(parent.template on_destroy<AllOf>().disconnect(&storage), ...);
(parent.template on_construct<NoneOf>().disconnect(&storage), ...);
}
};
template<typename... Matcher>
static void disconnect(Registry &parent, storage_type &storage) {
(matcher_handler<Matcher>::disconnect(storage, parent), ...);
}
template<typename... Matcher, std::size_t... Index>
static void connect(Registry &parent, storage_type &storage, std::index_sequence<Index...>) {
static_assert(sizeof...(Matcher) < std::numeric_limits<mask_type>::digits, "Too many matchers");
(matcher_handler<Matcher>::template connect<Index>(storage, parent), ...);
}
public:
/*! @brief Allocator type. */
using allocator_type = Allocator;
/*! Basic registry type. */
using registry_type = Registry;
/*! @brief Underlying entity identifier. */
using entity_type = typename registry_type::entity_type;
/*! @brief Unsigned integer type. */
using size_type = std::size_t;
/*! @brief Random access iterator type. */
using iterator = typename registry_type::common_type::iterator;
/*! @brief Default constructor. */
basic_observer()
: basic_observer{allocator_type{}} {}
/**
* @brief Constructs an empty storage with a given allocator.
* @param allocator The allocator to use.
*/
explicit basic_observer(const allocator_type &allocator)
: release{},
parent{},
storage{allocator} {}
/*! @brief Default copy constructor, deleted on purpose. */
basic_observer(const basic_observer &) = delete;
/*! @brief Default move constructor, deleted on purpose. */
basic_observer(basic_observer &&) = delete;
/**
* @brief Creates an observer and connects it to a given registry.
* @tparam Matcher Types of matchers to use to initialize the observer.
* @param reg A valid reference to a registry.
* @param allocator The allocator to use.
*/
template<typename... Matcher>
basic_observer(registry_type &reg, basic_collector<Matcher...>, const allocator_type &allocator = allocator_type{})
: release{&basic_observer::disconnect<Matcher...>},
parent{&reg},
storage{allocator} {
connect<Matcher...>(reg, storage, std::index_sequence_for<Matcher...>{});
}
/*! @brief Default destructor. */
~basic_observer() = default;
/**
* @brief Default copy assignment operator, deleted on purpose.
* @return This observer.
*/
basic_observer &operator=(const basic_observer &) = delete;
/**
* @brief Default move assignment operator, deleted on purpose.
* @return This observer.
*/
basic_observer &operator=(basic_observer &&) = delete;
/**
* @brief Connects an observer to a given registry.
* @tparam Matcher Types of matchers to use to initialize the observer.
* @param reg A valid reference to a registry.
*/
template<typename... Matcher>
void connect(registry_type &reg, basic_collector<Matcher...>) {
disconnect();
storage.clear();
parent = &reg;
release = &basic_observer::disconnect<Matcher...>;
connect<Matcher...>(reg, storage, std::index_sequence_for<Matcher...>{});
}
/*! @brief Disconnects an observer from the registry it keeps track of. */
void disconnect() {
if(release) {
release(*parent, storage);
release = nullptr;
}
}
/**
* @brief Returns the number of elements in an observer.
* @return Number of elements.
*/
[[nodiscard]] size_type size() const noexcept {
return storage.size();
}
/**
* @brief Checks whether an observer is empty.
* @return True if the observer is empty, false otherwise.
*/
[[nodiscard]] bool empty() const noexcept {
return storage.empty();
}
/**
* @brief Direct access to the list of entities of the observer.
*
* The returned pointer is such that range `[data(), data() + size())` is
* always a valid range, even if the container is empty.
*
* @note
* Entities are in the reverse order as returned by the `begin`/`end`
* iterators.
*
* @return A pointer to the array of entities.
*/
[[nodiscard]] const entity_type *data() const noexcept {
return storage.data();
}
/**
* @brief Returns an iterator to the first entity of the observer.
*
* If the observer is empty, the returned iterator will be equal to `end()`.
*
* @return An iterator to the first entity of the observer.
*/
[[nodiscard]] iterator begin() const noexcept {
return storage.storage_type::base_type::begin();
}
/**
* @brief Returns an iterator that is past the last entity of the observer.
* @return An iterator to the entity following the last entity of the
* observer.
*/
[[nodiscard]] iterator end() const noexcept {
return storage.storage_type::base_type::end();
}
/*! @brief Clears the underlying container. */
void clear() noexcept {
storage.clear();
}
/**
* @brief Iterates entities and applies the given function object to them.
*
* The function object is invoked for each entity.<br/>
* The signature of the function must be equivalent to the following form:
*
* @code{.cpp}
* void(const entity_type);
* @endcode
*
* @tparam Func Type of the function object to invoke.
* @param func A valid function object.
*/
template<typename Func>
void each(Func func) const {
for(const auto entity: *this) {
func(entity);
}
}
/**
* @brief Iterates entities and applies the given function object to them,
* then clears the observer.
*
* @sa each
*
* @tparam Func Type of the function object to invoke.
* @param func A valid function object.
*/
template<typename Func>
void each(Func func) {
std::as_const(*this).each(std::move(func));
clear();
}
private:
void (*release)(registry_type &, storage_type &);
registry_type *parent;
storage_type storage;
};
} // namespace entt
#endif

1
src/entt/entt.hpp
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@@ -28,7 +28,6 @@
#include "entity/handle.hpp"
#include "entity/helper.hpp"
#include "entity/mixin.hpp"
#include "entity/observer.hpp"
#include "entity/organizer.hpp"
#include "entity/ranges.hpp"
#include "entity/registry.hpp"

1
test/CMakeLists.txt
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@@ -229,7 +229,6 @@ SETUP_BASIC_TEST(entity entt/entity/entity.cpp)
SETUP_BASIC_TEST(group entt/entity/group.cpp)
SETUP_BASIC_TEST(handle entt/entity/handle.cpp)
SETUP_BASIC_TEST(helper entt/entity/helper.cpp)
SETUP_BASIC_TEST(observer entt/entity/observer.cpp)
SETUP_BASIC_TEST(organizer entt/entity/organizer.cpp)
SETUP_BASIC_TEST(reactive_mixin entt/entity/reactive_mixin.cpp)
SETUP_BASIC_TEST(registry entt/entity/registry.cpp)

1
test/entt/entity/BUILD.bazel
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@@ -8,7 +8,6 @@ _TESTS = [
"group",
"handle",
"helper",
"observer",
"organizer",
"reactive_mixin",
"registry",

368
test/entt/entity/observer.cpp
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@@ -1,368 +0,0 @@
#include <utility>
#include <gtest/gtest.h>
#include <entt/entity/observer.hpp>
#include <entt/entity/registry.hpp>
TEST(Observer, Functionalities) {
entt::registry registry;
// NOLINTNEXTLINE(readability-static-accessed-through-instance)
entt::observer observer{registry, entt::collector.group<int>()};
ASSERT_EQ(observer.size(), 0u);
ASSERT_TRUE(observer.empty());
ASSERT_EQ(observer.begin(), observer.end());
const auto entity = registry.create();
registry.emplace<int>(entity);
ASSERT_EQ(observer.size(), 1u);
ASSERT_FALSE(observer.empty());
ASSERT_EQ(*observer.data(), entity);
ASSERT_NE(observer.begin(), observer.end());
ASSERT_EQ(++observer.begin(), observer.end());
ASSERT_EQ(*observer.begin(), entity);
observer.clear();
ASSERT_EQ(observer.size(), 0u);
ASSERT_TRUE(observer.empty());
observer.disconnect();
registry.erase<int>(entity);
registry.emplace<int>(entity);
ASSERT_EQ(observer.size(), 0u);
ASSERT_TRUE(observer.empty());
}
TEST(Observer, AllOf) {
// NOLINTNEXTLINE(readability-static-accessed-through-instance)
constexpr auto collector = entt::collector.group<int, char>(entt::exclude<float>).group<int, double>();
entt::registry registry;
entt::observer observer{registry, collector};
const auto entity = registry.create();
ASSERT_TRUE(observer.empty());
registry.emplace<int>(entity);
registry.emplace<char>(entity);
ASSERT_EQ(observer.size(), 1u);
ASSERT_FALSE(observer.empty());
ASSERT_EQ(*observer.data(), entity);
registry.emplace<double>(entity);
ASSERT_FALSE(observer.empty());
registry.erase<int>(entity);
ASSERT_TRUE(observer.empty());
registry.emplace<float>(entity);
registry.emplace<int>(entity);
ASSERT_FALSE(observer.empty());
registry.erase<double>(entity);
ASSERT_TRUE(observer.empty());
registry.emplace<double>(entity);
observer.clear();
ASSERT_TRUE(observer.empty());
observer.disconnect();
registry.emplace_or_replace<int>(entity);
registry.emplace_or_replace<char>(entity);
registry.erase<float>(entity);
ASSERT_TRUE(observer.empty());
}
TEST(Observer, AllOfFiltered) {
// NOLINTNEXTLINE(readability-static-accessed-through-instance)
constexpr auto collector = entt::collector.group<int>().where<char>(entt::exclude<double>);
entt::registry registry;
entt::observer observer{registry, collector};
const auto entity = registry.create();
ASSERT_TRUE(observer.empty());
registry.emplace<int>(entity);
ASSERT_EQ(observer.size(), 0u);
ASSERT_TRUE(observer.empty());
registry.erase<int>(entity);
registry.emplace<char>(entity);
registry.emplace<double>(entity);
registry.emplace<int>(entity);
ASSERT_TRUE(observer.empty());
registry.erase<int>(entity);
registry.erase<double>(entity);
registry.emplace<int>(entity);
ASSERT_EQ(observer.size(), 1u);
ASSERT_FALSE(observer.empty());
ASSERT_EQ(*observer.data(), entity);
registry.emplace<double>(entity);
ASSERT_TRUE(observer.empty());
registry.erase<double>(entity);
ASSERT_TRUE(observer.empty());
observer.disconnect();
registry.erase<int>(entity);
registry.emplace<int>(entity);
ASSERT_TRUE(observer.empty());
}
TEST(Observer, Observe) {
entt::registry registry;
// NOLINTNEXTLINE(readability-static-accessed-through-instance)
entt::observer observer{registry, entt::collector.update<int>().update<char>()};
const auto entity = registry.create();
ASSERT_TRUE(observer.empty());
registry.emplace<int>(entity);
registry.emplace<char>(entity);
ASSERT_TRUE(observer.empty());
registry.emplace_or_replace<int>(entity);
ASSERT_EQ(observer.size(), 1u);
ASSERT_FALSE(observer.empty());
ASSERT_EQ(*observer.data(), entity);
observer.clear();
registry.replace<char>(entity);
ASSERT_FALSE(observer.empty());
observer.clear();
ASSERT_TRUE(observer.empty());
observer.disconnect();
registry.emplace_or_replace<int>(entity);
registry.emplace_or_replace<char>(entity);
ASSERT_TRUE(observer.empty());
}
TEST(Observer, ObserveFiltered) {
// NOLINTNEXTLINE(readability-static-accessed-through-instance)
constexpr auto collector = entt::collector.update<int>().where<char>(entt::exclude<double>);
entt::registry registry;
entt::observer observer{registry, collector};
const auto entity = registry.create();
ASSERT_TRUE(observer.empty());
registry.emplace<int>(entity);
registry.replace<int>(entity);
ASSERT_EQ(observer.size(), 0u);
ASSERT_TRUE(observer.empty());
registry.emplace<char>(entity);
registry.emplace<double>(entity);
registry.replace<int>(entity);
ASSERT_TRUE(observer.empty());
registry.erase<double>(entity);
registry.replace<int>(entity);
ASSERT_EQ(observer.size(), 1u);
ASSERT_FALSE(observer.empty());
ASSERT_EQ(*observer.data(), entity);
registry.emplace<double>(entity);
ASSERT_TRUE(observer.empty());
registry.erase<double>(entity);
ASSERT_TRUE(observer.empty());
observer.disconnect();
registry.replace<int>(entity);
ASSERT_TRUE(observer.empty());
}
TEST(Observer, AllOfObserve) {
entt::registry registry;
entt::observer observer{};
const auto entity = registry.create();
// NOLINTNEXTLINE(readability-static-accessed-through-instance)
observer.connect(registry, entt::collector.group<int>().update<char>());
ASSERT_TRUE(observer.empty());
registry.emplace<int>(entity);
registry.emplace<char>(entity);
registry.replace<char>(entity);
registry.erase<int>(entity);
ASSERT_EQ(observer.size(), 1u);
ASSERT_FALSE(observer.empty());
ASSERT_EQ(*observer.data(), entity);
registry.erase<char>(entity);
registry.emplace<char>(entity);
ASSERT_TRUE(observer.empty());
registry.replace<char>(entity);
observer.clear();
ASSERT_TRUE(observer.empty());
observer.disconnect();
registry.emplace_or_replace<int>(entity);
registry.emplace_or_replace<char>(entity);
ASSERT_TRUE(observer.empty());
}
TEST(Observer, CrossRulesCornerCase) {
entt::registry registry;
// NOLINTNEXTLINE(readability-static-accessed-through-instance)
entt::observer observer{registry, entt::collector.group<int>().group<char>()};
const auto entity = registry.create();
registry.emplace<int>(entity);
observer.clear();
ASSERT_TRUE(observer.empty());
registry.emplace<char>(entity);
registry.erase<int>(entity);
ASSERT_FALSE(observer.empty());
}
TEST(Observer, Each) {
entt::registry registry;
// NOLINTNEXTLINE(readability-static-accessed-through-instance)
entt::observer observer{registry, entt::collector.group<int>()};
const auto entity = registry.create();
registry.emplace<int>(entity);
ASSERT_FALSE(observer.empty());
ASSERT_EQ(observer.size(), 1u);
std::as_const(observer).each([entity](const auto entt) {
ASSERT_EQ(entity, entt);
});
ASSERT_FALSE(observer.empty());
ASSERT_EQ(observer.size(), 1u);
observer.each([entity](const auto entt) {
ASSERT_EQ(entity, entt);
});
ASSERT_TRUE(observer.empty());
ASSERT_EQ(observer.size(), 0u);
}
TEST(Observer, MultipleFilters) {
// NOLINTNEXTLINE(readability-static-accessed-through-instance)
constexpr auto collector = entt::collector.update<int>().where<char>().update<double>().where<float>();
entt::registry registry;
entt::observer observer{registry, collector};
const auto entity = registry.create();
ASSERT_TRUE(observer.empty());
registry.emplace_or_replace<int>(entity);
registry.emplace<char>(entity);
ASSERT_TRUE(observer.empty());
registry.emplace_or_replace<int>(entity);
ASSERT_EQ(observer.size(), 1u);
ASSERT_FALSE(observer.empty());
ASSERT_EQ(*observer.data(), entity);
observer.clear();
registry.emplace<double>(entity);
ASSERT_TRUE(observer.empty());
registry.emplace_or_replace<double>(entity);
registry.emplace<float>(entity);
ASSERT_TRUE(observer.empty());
registry.emplace_or_replace<double>(entity);
ASSERT_EQ(observer.size(), 1u);
ASSERT_FALSE(observer.empty());
ASSERT_EQ(*observer.data(), entity);
registry.erase<float>(entity);
ASSERT_TRUE(observer.empty());
registry.emplace_or_replace<int>(entity);
ASSERT_EQ(observer.size(), 1u);
ASSERT_FALSE(observer.empty());
ASSERT_EQ(*observer.data(), entity);
observer.clear();
observer.disconnect();
registry.emplace_or_replace<int>(entity);
ASSERT_TRUE(observer.empty());
}
TEST(Observer, GroupCornerCase) {
// NOLINTBEGIN(readability-static-accessed-through-instance)
constexpr auto add_collector = entt::collector.group<int>(entt::exclude<char>);
constexpr auto remove_collector = entt::collector.group<int, char>();
// NOLINTEND(readability-static-accessed-through-instance)
entt::registry registry;
entt::observer add_observer{registry, add_collector};
entt::observer remove_observer{registry, remove_collector};
const auto entity = registry.create();
registry.emplace<int>(entity);
ASSERT_FALSE(add_observer.empty());
ASSERT_TRUE(remove_observer.empty());
add_observer.clear();
registry.emplace<char>(entity);
ASSERT_TRUE(add_observer.empty());
ASSERT_FALSE(remove_observer.empty());
remove_observer.clear();
registry.erase<char>(entity);
ASSERT_FALSE(add_observer.empty());
ASSERT_TRUE(remove_observer.empty());
}