fix assign filled feature bug, add registry_filler

headers/ecs.hpp/ecs.hpp

@@ -68,6 +68,7 @@ namespace ecs_hpp
     class aspect;
 
     class entity_filler;
+    class registry_filler;
 }
 
 namespace ecs_hpp
@@ -1813,6 +1814,20 @@ namespace ecs_hpp
     private:
         entity& entity_;
     };
+
+    class registry_filler final {
+    public:
+        registry_filler(registry& registry) noexcept
+        : registry_(registry) {}
+
+        template < typename Tag, typename... Args >
+        registry_filler& feature(Args&&... args) {
+            registry_.assign_feature<Tag>(std::forward<Args>(args)...);
+            return *this;
+        }
+    private:
+        registry& registry_;
+    };
 }
 
 // -----------------------------------------------------------------------------
@@ -2836,7 +2851,7 @@ namespace ecs_hpp
             return *f = feature{std::forward<Args>(args)...};
         }
         assert(!features_locker_.is_locked());
-        return *features_.insert(feature_id, feature()).first;
+        return *features_.insert(feature_id, feature{std::forward<Args>(args)...}).first;
     }
 
     template < typename Tag, typename... Args >

scripts/gen_msvc2017_project.bat

@@ -0,0 +1,12 @@
+@echo off
+set BUILD_DIR=%~dp0%\..\build
+mkdir %BUILD_DIR%\msvc2017 || goto :error
+cd %BUILD_DIR%\msvc2017 || goto :error
+cmake -G "Visual Studio 15 2017" ..\.. || goto :error
+start ecs.hpp.sln || goto :error
+
+goto :EOF
+
+:error
+echo Failed with error #%errorlevel%.
+exit /b %errorlevel%

scripts/gen_msvc2019_project.bat

@@ -0,0 +1,12 @@
+@echo off
+set BUILD_DIR=%~dp0%\..\build
+mkdir %BUILD_DIR%\msvc2019 || goto :error
+cd %BUILD_DIR%\msvc2019 || goto :error
+cmake -G "Visual Studio 16 2019" ..\.. || goto :error
+start ecs.hpp.sln || goto :error
+
+goto :EOF
+
+:error
+echo Failed with error #%errorlevel%.
+exit /b %errorlevel%

scripts/gen_xcode_project.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -e
+BUILD_DIR=`dirname "$BASH_SOURCE"`/../build
+mkdir -p $BUILD_DIR/xcode
+cd $BUILD_DIR/xcode
+cmake -G Xcode ../..
+open ecs.hpp.xcodeproj

untests/ecs_tests.cpp

@@ -1583,10 +1583,11 @@ TEST_CASE("registry") {
 
         ecs::registry w;
 
-        w.assign_feature<struct physics>()
-            .add_system<gravity_system>(9)
-            .add_system<movement_system>()
-            .add_system<physics_system>();
+        ecs::registry_filler(w)
+            .feature<struct physics>(ecs::feature()
+                .add_system<gravity_system>(9)
+                .add_system<movement_system>()
+                .add_system<physics_system>());
 
         ecs::entity e = w.create_entity();
         e.assign_component<position_c>(1,2);