text: ///\file
  
  /******************************************************************************
  The MIT License(MIT)
  
  Embedded Template Library.
  https://github.com/ETLCPP/etl
  http://www.etlcpp.com
  
  Copyright(c) 2014 jwellbelove
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files(the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions :
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
  ******************************************************************************/
  
  #ifndef __ETL_LOG__
  #define __ETL_LOG__
  
  #include <stddef.h>
  
  #include "../../external/etl/platform.h"
  
  ///\defgroup log log
  /// log<N, BASE> : Calculates logs to any base, rounded down to the nearest integer.<br>
  /// log2<N>      : Calculates logs to base 2, rounded down to the nearest integer.<br>
  /// log10<N>     : Calculates logs to base 10, rounded down to the nearest integer.<br>
  ///\ingroup maths
  
  namespace etl 
  {
    //***************************************************************************
    ///\ingroup log
    /// The base generic log template.
    /// Defines <b>value</b> as the log of the number at the specified base.
    /// The result is rounded down to the next integer.
    ///\tparam NV   The number to find the log of.
    ///\tparam BASE The base of the log.
    //***************************************************************************
    template <const size_t NV, const size_t BASE>
    struct log
    {
      enum value_type
      {
        // Recursive definition.
        value = (NV >= BASE) ? 1 + log<NV / BASE, BASE>::value : 0
      };
    };
  
    //***************************************************************************
    // Specialisation for N = 1
    //***************************************************************************
    template <const size_t BASE>
    struct log<1, BASE>
    {
      enum value_type
      {
        value = 0
      };
    };
  
    //***************************************************************************
    // Specialisation for N = 0
    //***************************************************************************
    template <const size_t BASE>
    struct log<0, BASE>
    {
      enum value_type
      {
        value = 0
      };
    };
  
    //***************************************************************************
    ///\ingroup log
    /// Calculates base 2 logs.
    //***************************************************************************
    template <const size_t NV>
    struct log2
    {
      enum value_type
      {
        value = log<NV, 2>::value
      };
    };
  
    //***************************************************************************
    ///\ingroup log
    /// Calculates base 10 logs.
    //***************************************************************************
    template <const size_t NV>
    struct log10
    {
      enum value_type
      {
        value = log<NV, 10>::value
      };
    };
  }
  
  #endif
  