upgrade util::Buffer

src/util/Buffer.hpp

@@ -2,6 +2,7 @@
 
 #include <memory>
 #include <cstring>
+#include <initializer_list>
 
 namespace util {
     /// @brief Template similar to std::unique_ptr stores a buffer with its size
@@ -26,6 +27,19 @@ namespace util {
             std::memcpy(ptr.get(), src, length);
         }
 
+        Buffer(std::initializer_list<T> values)
+         : ptr(std::make_unique<T>(values)), length(values.size()) {}
+
+        Buffer(std::nullptr_t) noexcept : ptr(nullptr), length(0) {}
+
+        inline bool operator==(std::nullptr_t) const noexcept {
+            return ptr == nullptr;
+        }
+
+        inline bool operator!=(std::nullptr_t) const noexcept {
+            return ptr != nullptr;
+        }
+
         T& operator[](long long index) {
             return ptr[index];
         }