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diff --git a/src/armadillo/include/armadillo_bits/fill.hpp b/src/armadillo/include/armadillo_bits/fill.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 fill
+//! @{
+
+
+namespace fill
+  {
+  struct fill_none  {};
+  struct fill_zeros {};
+  struct fill_ones  {};
+  struct fill_eye   {};
+  struct fill_randu {};
+  struct fill_randn {};
+  
+  template<typename fill_type> 
+  struct fill_class { inline constexpr fill_class() {} };
+  
+  static constexpr fill_class<fill_none > none;
+  static constexpr fill_class<fill_zeros> zeros;
+  static constexpr fill_class<fill_ones > ones;
+  static constexpr fill_class<fill_eye  > eye;
+  static constexpr fill_class<fill_randu> randu;
+  static constexpr fill_class<fill_randn> randn;
+  
+  //
+  
+  template<typename from_type, typename to_type>
+  struct allow_conversion
+    {
+    static constexpr bool value = true;
+    };
+
+  template<> struct allow_conversion<std::complex<double>, double> { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<double>, float > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<double>, u64   > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<double>, s64   > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<double>, u32   > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<double>, s32   > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<double>, u16   > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<double>, s16   > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<double>, u8    > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<double>, s8    > { static constexpr bool value = false; };
+
+  template<> struct allow_conversion<std::complex<float>, double> { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<float>, float > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<float>, u64   > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<float>, s64   > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<float>, u32   > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<float>, s32   > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<float>, u16   > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<float>, s16   > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<float>, u8    > { static constexpr bool value = false; };
+  template<> struct allow_conversion<std::complex<float>, s8    > { static constexpr bool value = false; };
+  
+  //
+  
+  template<typename eT> inline bool isfinite_wrapper(eT                )  { return true;                                               }
+  template<>            inline bool isfinite_wrapper(float            x)  { return std::isfinite(x);                                   }
+  template<>            inline bool isfinite_wrapper(double           x)  { return std::isfinite(x);                                   }
+  template<typename  T> inline bool isfinite_wrapper(std::complex<T>& x)  { return std::isfinite(x.real()) && std::isfinite(x.imag()); }
+  
+  //
+  
+  template<typename scalar_type1>
+  struct scalar_holder
+    {
+    const scalar_type1 scalar;
+    
+    inline explicit scalar_holder(const scalar_type1& in_scalar) : scalar(in_scalar) {}
+    
+    inline scalar_holder() = delete;
+    
+    template
+      <
+      typename scalar_type2,
+      typename arma::enable_if2<allow_conversion<scalar_type1, scalar_type2>::value, int>::result = 0
+      >
+    inline
+    operator scalar_holder<scalar_type2>() const
+      {
+      const bool ok_conversion = (std::is_integral<scalar_type2>::value && std::is_floating_point<scalar_type1>::value) ? isfinite_wrapper(scalar) : true;
+      
+      return scalar_holder<scalar_type2>( ok_conversion ? scalar_type2(scalar) : scalar_type2(0) );
+      }
+    };
+  
+  //
+  
+  template<typename scalar_type>
+  inline
+  typename enable_if2< is_supported_elem_type<scalar_type>::value, scalar_holder<scalar_type> >::result
+  value(const scalar_type& in_scalar)
+    {
+    return scalar_holder<scalar_type>(in_scalar);
+    }
+  }
+
+
+//! @}