see #3

CMakeLists.txt

@@ -47,7 +47,7 @@ message("*")
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--no-undefined")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic -Wall")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic -Wall -Wconversion")
 # set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-Wextra -Weffc++")
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O0 -g -DDEBUG")
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3 -DRELEASE")

src/component_pool.hpp

@@ -78,7 +78,7 @@ public:
             reverse.resize(entity+1);
         }
 
-        reverse[entity] = direct.size();
+        reverse[entity] = pos_type(direct.size());
         direct.emplace_back(entity);
         data.push_back({ args... });
 
@@ -124,7 +124,11 @@ public:
     using size_type = typename Pool<Component>::size_type;
 
     explicit ComponentPool(size_type dim = 4098) noexcept
+#ifdef _MSC_VER
+        : ComponentPool<Entity, Component>{dim}, ComponentPool<Entity, Components>{dim}...
+#else
         : Pool<Component>{dim}, Pool<Components>{dim}...
+#endif
     {
         assert(!(dim < 0));
     }

src/registry.hpp

@@ -243,11 +243,11 @@ public:
     Registry & operator=(Registry &&) = delete;
 
     size_type size() const noexcept {
-        return static_cast<size_type>(count - available.size());
+        return count - available.size();
     }
 
     size_type capacity() const noexcept {
-        return static_cast<size_type>(count);
+        return count;
     }
 
     template<typename Comp>