text: // 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 fn_diff
  //! @{
  
  
  
  template<typename T1>
  arma_warn_unused
  arma_inline
  typename
  enable_if2
    <
    is_arma_type<T1>::value && resolves_to_vector<T1>::yes,
    const Op<T1, op_diff_vec>
    >::result
  diff
    (
    const T1&   X,
    const uword k = 1
    )
    {
    arma_extra_debug_sigprint();
    
    return Op<T1, op_diff_vec>(X, k, 0);
    }
  
  
  
  template<typename T1>
  arma_warn_unused
  arma_inline
  typename
  enable_if2
    <
    is_arma_type<T1>::value && resolves_to_vector<T1>::no,
    const Op<T1, op_diff>
    >::result
  diff
    (
    const T1&   X,
    const uword k = 1
    )
    {
    arma_extra_debug_sigprint();
    
    return Op<T1, op_diff>(X, k, 0);
    }
  
  
  
  template<typename T1>
  arma_warn_unused
  arma_inline
  typename
  enable_if2
    <
    is_arma_type<T1>::value,
    const Op<T1, op_diff>
    >::result
  diff
    (
    const T1&   X,
    const uword k,
    const uword dim
    )
    {
    arma_extra_debug_sigprint();
    
    return Op<T1, op_diff>(X, k, dim);
    }
  
  
  
  //! @}
  