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diff --git a/src/armadillo/include/armadillo_bits/span.hpp b/src/armadillo/include/armadillo_bits/span.hpp
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+// SPDX-License-Identifier: Apache-2.0
+// 
+// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
+// Copyright 2008-2016 National ICT Australia (NICTA)
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+
+
+//! \addtogroup span
+//! @{
+
+
+struct span_alt {};
+
+
+template<typename junk = int>
+class span_base
+  {
+  public:
+  static const span_alt all;
+  };
+
+
+template<typename junk>
+const span_alt span_base<junk>::all = span_alt();
+
+
+class span : public span_base<>
+  {
+  public:
+
+  uword a;
+  uword b;
+  bool  whole;
+  
+  inline
+  span()
+    : a(0)
+    , b(0)
+    , whole(true)
+    {
+    }
+  
+  
+  inline
+  span(const span_alt&)
+    : a(0)
+    , b(0)
+    , whole(true)
+    {
+    }
+  
+  
+  inline
+  explicit
+  span(const uword in_a)
+    : a(in_a)
+    , b(in_a)
+    , whole(false)
+    {
+    }
+  
+  
+  // the "explicit" keyword is required here to prevent automatic conversion of {a,b}
+  // into an instance of span() when submatrices are specified
+  inline
+  explicit
+  span(const uword in_a, const uword in_b)
+    : a(in_a)
+    , b(in_b)
+    , whole(false)
+    {
+    }
+
+  };
+
+
+
+//! @}