// 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 op_unique
//! @{

class op_unique : public traits_op_col {
 public:
  template <typename T1>
  inline static bool apply_helper(Mat<typename T1::elem_type>& out, const Proxy<T1>& P,
                                  const bool P_is_row);

  template <typename T1>
  inline static void apply(Mat<typename T1::elem_type>& out, const Op<T1, op_unique>& in);
};

class op_unique_vec : public traits_op_passthru {
 public:
  template <typename T1>
  inline static void apply(Mat<typename T1::elem_type>& out,
                           const Op<T1, op_unique_vec>& in);
};

template <typename eT>
struct arma_unique_comparator {
  arma_inline bool operator()(const eT a, const eT b) const { return (a < b); }
};

template <typename T>
struct arma_unique_comparator<std::complex<T> > {
  arma_inline bool operator()(const std::complex<T>& a, const std::complex<T>& b) const {
    const T a_real = a.real();
    const T b_real = b.real();

    return ((a_real < b_real) ? true
                              : ((a_real == b_real) ? (a.imag() < b.imag()) : false));
  }
};

//! @}
