Adding convenience append(range)

include/fmt/format.h

@@ -685,6 +685,13 @@ class basic_memory_buffer : public detail::buffer<T> {
 
   /** Increases the buffer capacity to *new_capacity*. */
   void reserve(size_t new_capacity) { this->try_reserve(new_capacity); }
+
+  // Directly append data into the buffer
+  using detail::buffer<T>::append;
+  template <typename ContiguousRange>
+  void append(const ContiguousRange& range) {
+    append(range.data(), range.data() + range.size());
+  }
 };
 
 template <typename T, size_t SIZE, typename Allocator>