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diff --git a/src/armadillo/include/armadillo_bits/wall_clock_bones.hpp b/src/armadillo/include/armadillo_bits/wall_clock_bones.hpp
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+++ b/src/armadillo/include/armadillo_bits/wall_clock_bones.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 wall_clock
+//! @{
+
+
+//! Class for measuring time intervals
+class wall_clock
+  {
+  public:
+  
+  inline  wall_clock();
+  inline ~wall_clock();
+  
+                   inline void   tic();  //!< start the timer
+  arma_warn_unused inline double toc();  //!< return the number of seconds since the last call to tic()
+  
+  
+  private:
+  
+  bool valid = false;
+  
+  std::chrono::steady_clock::time_point chrono_time1;
+  };
+
+
+//! @}