Added size() method

src/libs/core/include/core/EnumSet.hpp

@@ -19,6 +19,7 @@
 
 #pragma once
 
+#include <bit>
 #include <cassert>
 #include <cstdint>
 #include <initializer_list>
@@ -51,6 +52,11 @@ namespace lms::core
             assign(begin, end);
         }
 
+        constexpr std::size_t size() const
+        {
+            return std::popcount(_bitfield);
+        }
+
         template<typename It>
         constexpr void assign(It begin, It end)
         {

src/libs/core/test/EnumSet.cpp

@@ -31,9 +31,19 @@ namespace lms::core
             Two,
         };
 
+        {
+            constexpr EnumSet<Foo> test;
+
+            static_assert(test.size() == 0);
+            static_assert(test.empty());
+            static_assert(!test.contains(Foo::One));
+            static_assert(!test.contains(Foo::Two));
+        }
+
         {
             constexpr EnumSet<Foo> test{ Foo::One };
 
+            static_assert(test.size() == 1);
             static_assert(!test.empty());
             static_assert(test.contains(Foo::One));
             static_assert(!test.contains(Foo::Two));
@@ -49,6 +59,8 @@ namespace lms::core
             constexpr EnumSet<Foo> test{ Foo::One, Foo::Two };
             constexpr auto bitfield{ test.getBitfield() };
 
+            static_assert(test.size() == 2);
+
             EnumSet<Foo> test2;
             EXPECT_FALSE(test2.contains(Foo::One));
             EXPECT_FALSE(test2.contains(Foo::Two));