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diff --git a/src/armadillo/include/armadillo_bits/distr_param.hpp b/src/armadillo/include/armadillo_bits/distr_param.hpp
new file mode 100644
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+++ b/src/armadillo/include/armadillo_bits/distr_param.hpp
@@ -0,0 +1,91 @@
+// 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 distr_param
+//! @{
+
+
+
+class distr_param
+  {
+  public:
+  
+  const uword state;
+  
+  private:
+  
+  int a_int;
+  int b_int;
+    
+  double a_double;
+  double b_double;
+  
+  public: 
+  
+  inline distr_param()
+    : state   (0)
+    , a_int   (0)
+    , b_int   (0)
+    , a_double(0)
+    , b_double(0)
+    {
+    }
+  
+  
+  inline explicit distr_param(const int a, const int b)
+    : state   (1)
+    , a_int   (a)
+    , b_int   (b)
+    , a_double(double(a))
+    , b_double(double(b))
+    {
+    }
+  
+  
+  inline explicit distr_param(const double a, const double b)
+    : state   (2)
+    , a_int   (int(a))
+    , b_int   (int(b))
+    , a_double(a)
+    , b_double(b)
+    {
+    }
+  
+  
+  inline void get_int_vals(int& out_a, int& out_b) const
+    {
+    if(state == 0)  { return; }
+    
+    out_a = a_int;
+    out_b = b_int;
+    }
+  
+  
+  inline void get_double_vals(double& out_a, double& out_b) const
+    {
+    if(state == 0)  { return; }
+    
+    out_a = a_double;
+    out_b = b_double;
+    }
+  };
+
+
+
+//! @}