Improve ring_buffer.hpp

rt/include/typon/fundamental/ring_buffer.hpp

@@ -18,14 +18,12 @@ namespace typon::fdt::lock_free
 
     using enum std::memory_order;
 
-    const u8 _bits;
     const u64 _mask;
     ring_buffer * _next;
     std::atomic<T> * const _array;
 
     ring_buffer(u8 bits, ring_buffer * next = nullptr) noexcept
-      : _bits(bits)
-      , _mask(this->capacity() - 1)
+      : _mask((u64(1) << bits) - 1)
       , _next(next)
       , _array(new std::atomic<T>[this->capacity()])
     {}
@@ -41,7 +39,7 @@ namespace typon::fdt::lock_free
 
     u64 capacity() noexcept
     {
-      return u64(1) << _bits;
+      return _mask + 1;
     }
 
     void put(u64 index, T object) noexcept
@@ -65,7 +63,8 @@ namespace typon::fdt::lock_free
 
     ring_buffer * grow(u64 start, u64 end) noexcept
     {
-      return fill(new ring_buffer(_bits + 1, this), start, end);
+      auto buffer = new ring_buffer(std::countr_one(_mask) + 1, this);
+      return fill(buffer, start, end);
     }
 
     ring_buffer * shrink(u64 start, u64 end) noexcept