std::set works better for entity groups

CMakeLists.txt

@@ -2,6 +2,14 @@ cmake_minimum_required(VERSION 3.22.0)
 
 set(PROJECT_NAME zecsy)
 
+if(NOT CMAKE_BUILD_TYPE)
+  set(CMAKE_BUILD_TYPE Release)
+endif()
+
+set(CMAKE_CXX_FLAGS "-Wall -Wextra")
+set(CMAKE_CXX_FLAGS_DEBUG "-g")
+set(CMAKE_CXX_FLAGS_RELEASE "-O3")
+
 project(${PROJECT_NAME})
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 

tests/zecsy.cpp

@@ -7,7 +7,7 @@
 
 using namespace zecsy;
 
-TEST_CASE("Create a single entity and verify its existence")
+TEST_CASE("Create a single entity and verify its existence", "[test]")
 {
     world w;
 
@@ -16,7 +16,8 @@ TEST_CASE("Create a single entity and verify its existence")
     REQUIRE(w.is_alive(e));
 }
 
-TEST_CASE("Destroy an entity and ensure it no longer exists in the world")
+TEST_CASE("Destroy an entity and ensure it no longer exists in the world",
+          "[test]")
 {
     world w;
 
@@ -26,7 +27,7 @@ TEST_CASE("Destroy an entity and ensure it no longer exists in the world")
     REQUIRE_FALSE(w.is_alive(e));
 }
 
-TEST_CASE("Entity #0 should be reserved and never used")
+TEST_CASE("Entity #0 should be reserved and never used", "[test]")
 {
     world w;
 
@@ -40,7 +41,8 @@ struct ChoosenOne
 {
 };
 
-TEST_CASE("Entity shouldn't have a component that wasn't attached to it")
+TEST_CASE("Entity shouldn't have a component that wasn't attached to it",
+          "[test]")
 {
     world w;
 
@@ -49,7 +51,7 @@ TEST_CASE("Entity shouldn't have a component that wasn't attached to it")
     REQUIRE_FALSE(w.has<ChoosenOne>(e));
 }
 
-TEST_CASE("Attempt of getting non-owned component should throw")
+TEST_CASE("Attempt of getting non-owned component should throw", "[test]")
 {
     world w;
 
@@ -59,7 +61,8 @@ TEST_CASE("Attempt of getting non-owned component should throw")
 }
 
 TEST_CASE("Attach a simple component to an entity and verify it is correctly "
-          "associated")
+          "associated",
+          "[test]")
 {
     world w;
 
@@ -80,7 +83,8 @@ struct Comp
 };
 
 TEST_CASE("Retrieve a component from an entity and verify its data matches "
-          "what was set")
+          "what was set",
+          "[test]")
 {
     world w;
 
@@ -95,7 +99,8 @@ TEST_CASE("Retrieve a component from an entity and verify its data matches "
 }
 
 TEST_CASE(
-    "Remove a component from an entity and verify it is no longer attached")
+    "Remove a component from an entity and verify it is no longer attached",
+    "[test]")
 {
     world w;
 
@@ -111,7 +116,7 @@ TEST_CASE(
     REQUIRE_FALSE(w.has<ChoosenOne>(e));
 }
 
-TEST_CASE("Addresses of removed components should be reused")
+TEST_CASE("Addresses of removed components should be reused", "[test]")
 {
     world w;
     std::vector<entity_id> entities;
@@ -156,7 +161,8 @@ TEST_CASE("Addresses of removed components should be reused")
 }
 
 TEST_CASE("Attach multiple components to an entity and verify all are "
-          "correctly stored and retrievable")
+          "correctly stored and retrievable",
+          "[test]")
 {
     world w;
 
@@ -173,7 +179,8 @@ TEST_CASE("Attach multiple components to an entity and verify all are "
 }
 
 TEST_CASE("Create a simple system that processes entities with a specific "
-          "component and verify it executes correctly")
+          "component and verify it executes correctly",
+          "[test]")
 {
     struct Component
     {
@@ -200,7 +207,8 @@ TEST_CASE("Create a simple system that processes entities with a specific "
 }
 
 TEST_CASE("Test a systems ability to query and process only entities with a "
-          "specific combination of components")
+          "specific combination of components",
+          "[test]")
 {
     struct C0
     {
@@ -226,7 +234,8 @@ TEST_CASE("Test a systems ability to query and process only entities with a "
     REQUIRE(w.get<C0>(e0).value == 0);
     REQUIRE(w.get<C1>(e0).value == 10);
 
-    w.query<C0, C1>([e0](entity_id e, C0& c0, C1& c1)
+    w.query<C0, C1>(
+        [e0](entity_id e, C0& c0, C1& c1)
         {
             REQUIRE(e == e0);
             c0.value++;
@@ -243,7 +252,7 @@ TEST_CASE("Test a systems ability to query and process only entities with a "
     REQUIRE_FALSE(w.has<C0>(e2));
 }
 
-TEST_CASE("Systems execute at correct frequencies")
+TEST_CASE("Systems execute at correct frequencies", "[test]")
 {
     world w;
     system_scheduler scheduler;
@@ -268,7 +277,7 @@ TEST_CASE("Systems execute at correct frequencies")
     REQUIRE(slow_count == 2);   // 1 Hz system should execute 1 time
 }
 
-TEST_CASE("Systems handle zero-frequency gracefully")
+TEST_CASE("Systems handle zero-frequency gracefully", "[test]")
 {
     world w;
     system_scheduler scheduler;
@@ -288,7 +297,7 @@ TEST_CASE("Systems handle zero-frequency gracefully")
     REQUIRE(zero_count == 0);
 }
 
-TEST_CASE("Systems handle varying update rates")
+TEST_CASE("Systems handle varying update rates", "[test]")
 {
     world w;
     system_scheduler scheduler;
@@ -308,7 +317,7 @@ TEST_CASE("Systems handle varying update rates")
     REQUIRE(varying_count == 10);
 }
 
-TEST_CASE("Systems handle large time steps")
+TEST_CASE("Systems handle large time steps", "[test]")
 {
     world w;
     system_scheduler scheduler;
@@ -325,7 +334,7 @@ TEST_CASE("Systems handle large time steps")
     REQUIRE(large_step_count == 2);
 }
 
-TEST_CASE("Systems handle multiple frequencies")
+TEST_CASE("Systems handle multiple frequencies", "[test]")
 {
     world w;
     system_scheduler scheduler;
@@ -351,7 +360,7 @@ TEST_CASE("Systems handle multiple frequencies")
     REQUIRE(slow_count == 1);    // 1 Hz system
 }
 
-TEST_CASE("Systems handle fractional frequencies")
+TEST_CASE("Systems handle fractional frequencies", "[test]")
 {
     world w;
     system_scheduler scheduler;
@@ -372,7 +381,7 @@ TEST_CASE("Systems handle fractional frequencies")
     REQUIRE(fractional_count == 2);
 }
 
-TEST_CASE("Systems handle zero delta time")
+TEST_CASE("Systems handle zero delta time", "[test]")
 {
     world w;
     system_scheduler scheduler;
@@ -389,7 +398,7 @@ TEST_CASE("Systems handle zero delta time")
     REQUIRE(zero_dt_count == 0);
 }
 
-TEST_CASE("Systems handle negative delta time")
+TEST_CASE("Systems handle negative delta time", "[test]")
 {
     world w;
     system_scheduler scheduler;
@@ -410,7 +419,7 @@ TEST_CASE("Systems handle negative delta time")
     REQUIRE(count == 2);
 }
 
-TEST_CASE("Entity count tracking")
+TEST_CASE("Entity count tracking", "[test]")
 {
     world w;
     REQUIRE(w.entity_count() == 0);
@@ -423,7 +432,7 @@ TEST_CASE("Entity count tracking")
     REQUIRE(w.entity_count() == 1);
 }
 
-TEST_CASE("Component counting mechanisms")
+TEST_CASE("Component counting mechanisms", "[test]")
 {
     struct Health
     {
@@ -454,7 +463,7 @@ TEST_CASE("Component counting mechanisms")
     REQUIRE(w.total_component_count() == 1);
 }
 
-TEST_CASE("Archetype signature management")
+TEST_CASE("Archetype signature management", "[test]")
 {
     struct A
     {
@@ -509,7 +518,7 @@ TEST_CASE("Archetype signature management")
     REQUIRE(w.archetype_count() == 0);
 }
 
-TEST_CASE("Component distribution across archetypes")
+TEST_CASE("Component distribution across archetypes", "[test]")
 {
     struct A
     {
@@ -547,7 +556,7 @@ TEST_CASE("Component distribution across archetypes")
     REQUIRE(w.archetype_count() == 3); //<A>, <A, B>, <B>
 }
 
-TEST_CASE("Entity inspection")
+TEST_CASE("Entity inspection", "[test]")
 {
     struct Transform
     {
@@ -572,3 +581,400 @@ TEST_CASE("Entity inspection")
     w.remove<Transform>(e);
     REQUIRE(w.components_in_entity(e) == 1);
 }
+
+namespace
+{
+    // Benchmark components
+    struct Position
+    {
+        float x, y;
+    };
+    struct Velocity
+    {
+        float dx, dy;
+    };
+    struct Health
+    {
+        int value;
+    };
+    struct BigData
+    {
+        char buffer[4096];
+    };
+
+    // Benchmark entity counts
+    constexpr int SMALL = 1'000;
+    constexpr int MEDIUM = 5'000;
+    constexpr int LARGE = 10'000;
+} // namespace
+
+TEST_CASE("Core operations benchmarks", "[benchmark]")
+{
+    BENCHMARK_ADVANCED("Create entities [1000]")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        meter.measure(
+            [&]
+            {
+                world w;
+                for(int i = 0; i < SMALL; ++i)
+                {
+                    w.make_entity();
+                }
+                return w.entity_count();
+            });
+    };
+
+    BENCHMARK_ADVANCED("Create entities [5000]")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        meter.measure(
+            [&]
+            {
+                world w;
+                for(int i = 0; i < MEDIUM; ++i)
+                {
+                    w.make_entity();
+                }
+                return w.entity_count();
+            });
+    };
+
+    BENCHMARK_ADVANCED("Create entities [10000]")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        meter.measure(
+            [&]
+            {
+                world w;
+                for(int i = 0; i < LARGE; ++i)
+                {
+                    w.make_entity();
+                }
+                return w.entity_count();
+            });
+    };
+
+    BENCHMARK_ADVANCED("Create entities with components [1000]")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        meter.measure(
+            [&]
+            {
+                world w;
+                for(int i = 0; i < SMALL; ++i)
+                {
+                    auto e = w.make_entity();
+                    w.set<Position>(e, {1.0f, 2.0f});
+                    w.set<Velocity>(e, {3.0f, 4.0f});
+                }
+                return w.total_component_count();
+            });
+    };
+
+    BENCHMARK_ADVANCED("Create entities with components [5000]")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        meter.measure(
+            [&]
+            {
+                world w;
+                for(int i = 0; i < MEDIUM; ++i)
+                {
+                    auto e = w.make_entity();
+                    w.set<Position>(e, {1.0f, 2.0f});
+                    w.set<Velocity>(e, {3.0f, 4.0f});
+                }
+                return w.total_component_count();
+            });
+    };
+
+    BENCHMARK_ADVANCED("Create entities with components [10000]")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        meter.measure(
+            [&]
+            {
+                world w;
+                for(int i = 0; i < LARGE; ++i)
+                {
+                    auto e = w.make_entity();
+                    w.set<Position>(e, {1.0f, 2.0f});
+                    w.set<Velocity>(e, {3.0f, 4.0f});
+                }
+                return w.total_component_count();
+            });
+    };
+}
+
+TEST_CASE("Component operations benchmarks", "[benchmark]")
+{
+    BENCHMARK_ADVANCED("Add component to existing entities [1000]")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        world w;
+        std::vector<entity_id> entities;
+        for(int i = 0; i < SMALL; ++i)
+        {
+            entities.push_back(w.make_entity());
+        }
+
+        meter.measure(
+            [&]
+            {
+                for(auto e: entities)
+                {
+                    w.set<Health>(e, {100});
+                }
+                return w.component_count<Health>();
+            });
+    };
+
+    BENCHMARK_ADVANCED("Add component to existing entities [5000]")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        world w;
+        std::vector<entity_id> entities;
+        for(int i = 0; i < MEDIUM; ++i)
+        {
+            entities.push_back(w.make_entity());
+        }
+
+        meter.measure(
+            [&]
+            {
+                for(auto e: entities)
+                {
+                    w.set<Health>(e, {100});
+                }
+                return w.component_count<Health>();
+            });
+    };
+
+    BENCHMARK_ADVANCED("Add component to existing entities [10000]")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        world w;
+        std::vector<entity_id> entities;
+        for(int i = 0; i < LARGE; ++i)
+        {
+            entities.push_back(w.make_entity());
+        }
+
+        meter.measure(
+            [&]
+            {
+                for(auto e: entities)
+                {
+                    w.set<Health>(e, {100});
+                }
+                return w.component_count<Health>();
+            });
+    };
+
+    BENCHMARK_ADVANCED("Remove component from entities [1000]")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        world w;
+        std::vector<entity_id> entities;
+        for(int i = 0; i < SMALL; ++i)
+        {
+            auto e = w.make_entity();
+            w.set<Health>(e, {100});
+            entities.push_back(e);
+        }
+
+        meter.measure(
+            [&]
+            {
+                for(auto e: entities)
+                {
+                    w.remove<Health>(e);
+                }
+                return w.component_count<Health>();
+            });
+    };
+
+    BENCHMARK_ADVANCED("Remove component from entities [5000]")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        world w;
+        std::vector<entity_id> entities;
+        for(int i = 0; i < MEDIUM; ++i)
+        {
+            auto e = w.make_entity();
+            w.set<Health>(e, {100});
+            entities.push_back(e);
+        }
+
+        meter.measure(
+            [&]
+            {
+                for(auto e: entities)
+                {
+                    w.remove<Health>(e);
+                }
+                return w.component_count<Health>();
+            });
+    };
+
+    BENCHMARK_ADVANCED("Remove component from entities [10000]")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        world w;
+        std::vector<entity_id> entities;
+        for(int i = 0; i < LARGE; ++i)
+        {
+            auto e = w.make_entity();
+            w.set<Health>(e, {100});
+            entities.push_back(e);
+        }
+
+        meter.measure(
+            [&]
+            {
+                for(auto e: entities)
+                {
+                    w.remove<Health>(e);
+                }
+                return w.component_count<Health>();
+            });
+    };
+}
+
+TEST_CASE("Query performance benchmarks", "[benchmark]")
+{
+    BENCHMARK_ADVANCED("Dense query (90% match)")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        world w;
+        for(int i = 0; i < LARGE; ++i)
+        {
+            auto e = w.make_entity();
+            w.set<Position>(e);
+            if(i % 10 != 0)
+                w.set<Velocity>(e); // 90% match
+        }
+
+        meter.measure(
+            [&]
+            {
+                int count = 0;
+                w.query<Position, Velocity>([&](auto...) { count++; });
+                return count;
+            });
+    };
+
+    BENCHMARK_ADVANCED("Sparse query (10% match)")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        world w;
+        for(int i = 0; i < LARGE; ++i)
+        {
+            auto e = w.make_entity();
+            w.set<Position>(e);
+            if(i % 10 == 0)
+                w.set<Velocity>(e); // 10% match
+        }
+
+        meter.measure(
+            [&]
+            {
+                int count = 0;
+                w.query<Position, Velocity>([&](auto...) { count++; });
+                return count;
+            });
+    };
+}
+
+TEST_CASE("Memory intensive benchmarks", "[benchmark]")
+{
+    BENCHMARK_ADVANCED("Large component allocation")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        meter.measure(
+            [&]
+            {
+                world w;
+                for(int i = 0; i < SMALL; ++i)
+                {
+                    auto e = w.make_entity();
+                    w.set<BigData>(e);
+                }
+                return w.total_component_count();
+            });
+    };
+
+    BENCHMARK_ADVANCED("Component memory reuse")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        world w;
+        std::vector<entity_id> entities;
+        for(int i = 0; i < SMALL; ++i)
+        {
+            auto e = w.make_entity();
+            w.set<BigData>(e);
+            entities.push_back(e);
+        }
+
+        meter.measure(
+            [&]
+            {
+                // Remove and re-add components
+                for(auto e: entities)
+                {
+                    w.remove<BigData>(e);
+                    w.set<BigData>(e);
+                }
+                return w.component_count<BigData>();
+            });
+    };
+}
+
+TEST_CASE("Archetype transition benchmarks", "[benchmark]")
+{
+    BENCHMARK_ADVANCED("Single component addition")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        world w;
+        std::vector<entity_id> entities;
+        for(int i = 0; i < MEDIUM; ++i)
+        {
+            entities.push_back(w.make_entity());
+        }
+
+        meter.measure(
+            [&]
+            {
+                for(auto e: entities)
+                {
+                    w.set<Health>(e);
+                }
+                return w.archetype_count();
+            });
+    };
+
+    BENCHMARK_ADVANCED("Multi-component transition")(
+        Catch::Benchmark::Chronometer meter)
+    {
+        world w;
+        std::vector<entity_id> entities;
+        for(int i = 0; i < MEDIUM; ++i)
+        {
+            auto e = w.make_entity();
+            w.set<Position>(e);
+            entities.push_back(e);
+        }
+
+        meter.measure(
+            [&]
+            {
+                for(auto e: entities)
+                {
+                    w.set<Velocity>(e);
+                    w.set<Health>(e);
+                }
+                return w.archetype_count();
+            });
+    };
+}

zecsy.hpp

@@ -97,7 +97,7 @@ namespace zecsy
         std::unordered_map<comp_id, component_pool> pools;
 
         using archetype_signature = std::vector<comp_id>;
-        using entity_group = std::vector<entity_id>;
+        using entity_group = std::set<entity_id>;
 
         struct archetype_hash
         {
@@ -186,7 +186,7 @@ namespace zecsy
 
         std::vector<comp_id> key;
         auto& group = archetypes[key];
-        group.emplace_back(id);
+        group.emplace(id);
 
         return id;
     }
@@ -199,7 +199,7 @@ namespace zecsy
         std::vector<comp_id> key(comp_set.begin(), comp_set.end());
 
         auto& group = archetypes[key];
-        group.erase(std::remove(group.begin(), group.end(), e), group.end());
+        group.erase(e);
 
         if(archetypes[key].empty())
         {
@@ -279,8 +279,7 @@ namespace zecsy
             std::vector<comp_id> old_key(old_set.begin(), old_set.end());
 
             auto& group = archetypes[old_key];
-            group.erase(std::remove(group.begin(), group.end(), e),
+            group.erase(e);
-                        group.end());
 
             if(archetypes[old_key].empty())
             {
@@ -288,7 +287,7 @@ namespace zecsy
             }
 
             std::vector<comp_id> new_key(comp_set.begin(), comp_set.end());
-            archetypes[new_key].emplace_back(e);
+            archetypes[new_key].emplace(e);
         }
     }
 
@@ -311,13 +310,12 @@ namespace zecsy
             std::sort(old_key.begin(), old_key.end());
 
             auto& old_group = archetypes[old_key];
-            old_group.erase(std::remove(old_group.begin(), old_group.end(), e),
+            old_group.erase(e);
-                            old_group.end());
 
             std::vector<comp_id> new_key(comp_set.begin(), comp_set.end());
             std::sort(new_key.begin(), new_key.end());
 
-            archetypes[new_key].emplace_back(e);
+            archetypes[new_key].emplace(e);
 
             if(archetypes[old_key].empty())
             {