diff --git a/code/common/aligned_allocator.h b/code/common/aligned_allocator.h
index 72160d06..36491473 100644
--- a/code/common/aligned_allocator.h
+++ b/code/common/aligned_allocator.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include "common/types.h"
 #include "common/macros.h"
diff --git a/code/common/bits.h b/code/common/bits.h
index e6f33008..09a0eb2f 100644
--- a/code/common/bits.h
+++ b/code/common/bits.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <algorithm>
 #include <limits>
diff --git a/code/common/clock.cc b/code/common/clock.cc
index fffd919e..ef0450e4 100644
--- a/code/common/clock.cc
+++ b/code/common/clock.cc
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #if defined(_WIN32)
     #include <Windows.h>
 #elif defined(__linux__)
diff --git a/code/common/clock.h b/code/common/clock.h
index d7f8931b..7812f72f 100644
--- a/code/common/clock.h
+++ b/code/common/clock.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <string_view>
 
diff --git a/code/common/console.cc b/code/common/console.cc
index 40faba22..f9fedd65 100644
--- a/code/common/console.cc
+++ b/code/common/console.cc
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #ifdef _WIN32
 #include <Windows.h>
 #endif
diff --git a/code/common/console.h b/code/common/console.h
index 811d1f5b..2bd58061 100644
--- a/code/common/console.h
+++ b/code/common/console.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <fmt/core.h>
 #include "common/strings.h"
diff --git a/code/common/console_logger.cc b/code/common/console_logger.cc
index 512b9dce..c7eb585e 100644
--- a/code/common/console_logger.cc
+++ b/code/common/console_logger.cc
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #include <chrono>
 #include "common/log.h"
 #include "common/debug.h"
diff --git a/code/common/console_logger.h b/code/common/console_logger.h
index d408cd59..572bf7a0 100644
--- a/code/common/console_logger.h
+++ b/code/common/console_logger.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 
 namespace common::log::console_logger
diff --git a/code/common/constants.h b/code/common/constants.h
index caf3cc53..64d1ea07 100644
--- a/code/common/constants.h
+++ b/code/common/constants.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 
 #include <limits>
diff --git a/code/common/data_stream.cc b/code/common/data_stream.cc
index 5778affc..489ab1eb 100644
--- a/code/common/data_stream.cc
+++ b/code/common/data_stream.cc
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #include "common/log.h"
 #include "common/debug.h"
 #include "common/macros.h"
diff --git a/code/common/data_stream.h b/code/common/data_stream.h
index e547e2d8..b64cf8fa 100644
--- a/code/common/data_stream.h
+++ b/code/common/data_stream.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <memory>
 #include <string_view>
diff --git a/code/common/debug.cc b/code/common/debug.cc
index 3fb3021f..769b56ad 100644
--- a/code/common/debug.cc
+++ b/code/common/debug.cc
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #include <vector>
 #include <limits>
 
diff --git a/code/common/debug.h b/code/common/debug.h
index 5b104129..fae67350 100644
--- a/code/common/debug.h
+++ b/code/common/debug.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <array>
 
diff --git a/code/common/dictionary.h b/code/common/dictionary.h
index 0e0a11fd..fbceb272 100644
--- a/code/common/dictionary.h
+++ b/code/common/dictionary.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <utility> // std::pair
 #include <algorithm> // std::find_if
diff --git a/code/common/dynamic_library.cc b/code/common/dynamic_library.cc
index cbdba304..438c233a 100644
--- a/code/common/dynamic_library.cc
+++ b/code/common/dynamic_library.cc
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #if defined(_WIN32)
 #include <wil/resource.h>
 #elif defined(__linux__)
diff --git a/code/common/dynamic_library.h b/code/common/dynamic_library.h
index d14a3904..26aac458 100644
--- a/code/common/dynamic_library.h
+++ b/code/common/dynamic_library.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <string_view>
 #include <memory>
diff --git a/code/common/file_helpers.cc b/code/common/file_helpers.cc
index 5386cc7d..3b31ac83 100644
--- a/code/common/file_helpers.cc
+++ b/code/common/file_helpers.cc
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #include "common/file_helpers.h"
 #include "common/debug.h"
 
diff --git a/code/common/file_helpers.h b/code/common/file_helpers.h
index 3bce4385..719fc5be 100644
--- a/code/common/file_helpers.h
+++ b/code/common/file_helpers.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <cstdio>
 #include "common/types.h"
diff --git a/code/common/helpers.h b/code/common/helpers.h
index ac86a34f..60ff5ee9 100644
--- a/code/common/helpers.h
+++ b/code/common/helpers.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include "common/types.h"
 
diff --git a/code/common/log.cc b/code/common/log.cc
index 06831472..4505128b 100644
--- a/code/common/log.cc
+++ b/code/common/log.cc
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #include <limits>
 
 #include "common/log.h"
diff --git a/code/common/log.h b/code/common/log.h
index 714ca6b8..835a6d86 100644
--- a/code/common/log.h
+++ b/code/common/log.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <functional>
 #include <optional>
diff --git a/code/common/macros.h b/code/common/macros.h
index f43dd4fd..270e543c 100644
--- a/code/common/macros.h
+++ b/code/common/macros.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 
 #include "common/helpers.h"
diff --git a/code/common/math.h b/code/common/math.h
index 61db92aa..3313fbc8 100644
--- a/code/common/math.h
+++ b/code/common/math.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <numbers>
 
diff --git a/code/common/platform.h b/code/common/platform.h
index fc9af3c4..c848efae 100644
--- a/code/common/platform.h
+++ b/code/common/platform.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 
 namespace common
diff --git a/code/common/result.h b/code/common/result.h
index 7f740139..6cc1b480 100644
--- a/code/common/result.h
+++ b/code/common/result.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <variant>
 
diff --git a/code/common/scoped_function.h b/code/common/scoped_function.h
index 4b54be06..ce06077d 100644
--- a/code/common/scoped_function.h
+++ b/code/common/scoped_function.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <concepts>
 #include <optional>
diff --git a/code/common/strings.cc b/code/common/strings.cc
index ce6242da..48516d86 100644
--- a/code/common/strings.cc
+++ b/code/common/strings.cc
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #if defined(_WIN32)
   #include <Windows.h>
 #elif defined(__linux__)
diff --git a/code/common/strings.h b/code/common/strings.h
index d667a64d..2be33385 100644
--- a/code/common/strings.h
+++ b/code/common/strings.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 
 #include <optional>
diff --git a/code/common/synchro.cc b/code/common/synchro.cc
index f7de141e..b38b9efa 100644
--- a/code/common/synchro.cc
+++ b/code/common/synchro.cc
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #if defined(_WIN32)
     #include <Windows.h>
 #elif defined(__linux__)
diff --git a/code/common/synchro.h b/code/common/synchro.h
index fbb2e115..e26b20fa 100644
--- a/code/common/synchro.h
+++ b/code/common/synchro.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <string_view>
 #include <thread>
diff --git a/code/common/types.h b/code/common/types.h
index 86f57b2d..4181cae4 100644
--- a/code/common/types.h
+++ b/code/common/types.h
@@ -1,9 +1,11 @@
+// SPDX-License-Identifier: MIT
+
 #pragma once
 #include <array>
 #include <cstdint>
 #include <cstddef>
 
-// unsigned
+// unsigned integer
 using u8     = std::uint8_t;
 using u16    = std::uint16_t;
 using u32    = std::uint32_t;
@@ -16,7 +18,7 @@ using ullong = unsigned long long;
 using usize  = std::size_t;
 using uptr   = std::uintptr_t;
 
-// signed
+// signed integer
 using s8     = std::int8_t;
 using s16    = std::int16_t;
 using s32    = std::int32_t;
@@ -25,11 +27,51 @@ using schar  = signed char;
 using sint   = signed int;
 using ssize  = std::intmax_t;
 
-// bool
-using b8  = u8;
-using b16 = u16;
-using b32 = u32;
-using b64 = u64;
+// wrapper for bools of a defined size
+template<typename underlying_type>
+requires std::is_unsigned_v<underlying_type>
+struct portable_bool
+{
+  using type = underlying_type;
+
+  constexpr portable_bool() = default;
+
+  constexpr portable_bool(bool init)
+  {
+    set(init);
+  }
+
+  constexpr bool set(const bool val)
+  {
+    value_ = static_cast<type>(val);
+
+    return value_;
+  }
+
+  constexpr explicit operator bool() const
+  {
+    return static_cast<bool>(value_);
+  }
+
+  constexpr bool operator =(bool val)
+  {
+    return set(val);
+  }
+
+  template<typename other>
+  static constexpr portable_bool<type> from(other val)
+  {
+    return portable_bool<type>{static_cast<bool>(val)};
+  }
+
+  type value_{ 0 };
+};
+
+// boolean
+using b8  = portable_bool<u8>;
+using b16 = portable_bool<u16>;
+using b32 = portable_bool<u32>;
+using b64 = portable_bool<u64>;
 
 // floating point
 using f32 = float;
diff --git a/test/common-test/common-test.vcxproj b/test/common-test/common-test.vcxproj
index 79bb4fea..feb8d6cb 100644
--- a/test/common-test/common-test.vcxproj
+++ b/test/common-test/common-test.vcxproj
@@ -12,6 +12,7 @@
   <ItemGroup>
     <ClCompile Include="aligned-allocator-test.cc" />
     <ClCompile Include="dictionary-test.cc" />
+    <ClCompile Include="portable_bool.cc" />
     <ClCompile Include="string-test.cc" />
     <ClCompile Include="vector-comparison-tests.cc" />
     <ClCompile Include="vector-math-tests.cc" />
diff --git a/test/common-test/portable_bool.cc b/test/common-test/portable_bool.cc
new file mode 100644
index 00000000..38f1ef7e
--- /dev/null
+++ b/test/common-test/portable_bool.cc
@@ -0,0 +1,30 @@
+#include <gtest/gtest.h>
+
+#include "common/types.h"
+
+TEST(PortableBool, ShouldConvertToBool)
+{
+  b8 val0 = true;
+  EXPECT_TRUE(val0);
+
+  val0 = false;
+  EXPECT_FALSE(val0);
+
+  b16 val1 = true;
+  EXPECT_TRUE(val1);
+
+  val1 = false;
+  EXPECT_FALSE(val1);
+
+  b32 val2 = true;
+  EXPECT_TRUE(val2);
+
+  val2 = false;
+  EXPECT_FALSE(val2);
+
+  b64 val3 = true;
+  EXPECT_TRUE(val3);
+
+  val3 = false;
+  EXPECT_FALSE(val3);
+}
\ No newline at end of file