Adjust constant and make all possible variables const

1 files changed, 5 insertions, 7 deletions

diff --git a/arch/x86_64/src/memory/allocator/area_frame_allocator.cpp b/arch/x86_64/src/memory/allocator/area_frame_allocator.cpp
index e03c66a..6ec3e95 100644
--- a/arch/x86_64/src/memory/allocator/area_frame_allocator.cpp
+++ b/arch/x86_64/src/memory/allocator/area_frame_allocator.cpp
@@ -28,7 +28,7 @@ namespace teachos::arch::memory::allocator
                                         return physical_frame::containing_address(address) >= next_free_frame;
                                       });
 
-    auto lowest_area_with_free_frames =
+    auto const lowest_area_with_free_frames =
         std::ranges::min_element(next_area_with_free_frames, [](multiboot::memory_area a, multiboot::memory_area b) {
           return a.base_address < b.base_address;
         });
@@ -37,7 +37,7 @@ namespace teachos::arch::memory::allocator
     {
       current_area = *lowest_area_with_free_frames;
       // Update the `next_free_frame` according to the new memory area
-      auto start_frame = physical_frame::containing_address(current_area.value().base_address);
+      auto const start_frame = physical_frame::containing_address(current_area.value().base_address);
       if (next_free_frame < start_frame)
       {
         next_free_frame = start_frame;
@@ -47,16 +47,14 @@ namespace teachos::arch::memory::allocator
 
   auto area_frame_allocator::allocate_frame() -> std::optional<physical_frame>
   {
-    /*
-     * Only try to allocate memory if current_area is not null, because
-     * the current_area is null if there is no more available memory.
-     */
+    // Only try to allocate memory if current_area is not null, because
+    // the current_area is null if there is no more available memory.
     if (!current_area.has_value())
     {
       return std::nullopt;
     }
 
-    auto address = current_area.value().base_address + current_area.value().area_length - 1;
+    auto const address = current_area.value().base_address + current_area.value().area_length - 1;
     physical_frame current_area_last_frame = physical_frame::containing_address(address);
 
     if (next_free_frame > current_area_last_frame)