// 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_trunc_log
//! @{

template <typename eT>
arma_warn_unused inline static typename arma_real_only<eT>::result trunc_log(const eT x) {
  if (std::numeric_limits<eT>::is_iec559) {
    if (x == std::numeric_limits<eT>::infinity()) {
      return Datum<eT>::log_max;
    } else {
      return (x <= eT(0)) ? Datum<eT>::log_min : std::log(x);
    }
  } else {
    return std::log(x);
  }
}

template <typename eT>
arma_warn_unused inline static typename arma_integral_only<eT>::result trunc_log(
    const eT x) {
  return eT(trunc_log(double(x)));
}

template <typename T>
arma_warn_unused inline static std::complex<T> trunc_log(const std::complex<T>& x) {
  return std::complex<T>(trunc_log(std::abs(x)), std::arg(x));
}

template <typename T1>
arma_warn_unused arma_inline
    typename enable_if2<is_arma_type<T1>::value, const eOp<T1, eop_trunc_log> >::result
    trunc_log(const T1& A) {
  arma_debug_sigprint();

  return eOp<T1, eop_trunc_log>(A);
}

template <typename T1>
arma_warn_unused arma_inline const eOpCube<T1, eop_trunc_log> trunc_log(
    const BaseCube<typename T1::elem_type, T1>& A) {
  arma_debug_sigprint();

  return eOpCube<T1, eop_trunc_log>(A.get_ref());
}

//! @}
