coffee/etl
1
0
Fork 0
mirror of https://github.com/ETLCPP/etl.git synced 2026-06-15 08:26:04 +08:00
Code Issues Packages Projects Releases Wiki Activity

Separated log & pow in individual files

Browse Source
This commit is contained in:
jwellbelove 2014-11-02 17:17:22 +00:00
parent f96a546b9a
commit f760a0f848
1 changed files with 0 additions and 138 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

138
maths.h
View File

@ -1,138 +0,0 @@
///\file
/******************************************************************************
The MIT License(MIT)
Embedded Template Library.
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_maths__
#define __etl_maths__
#include <cstddef>
///\defgroup log log
/// A set of templates to generate compile time constants.<br>
/// 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 'value' as the log of the number at the specified base.
/// The result is rounded down to the next integer.
///\tparam N The number to find the log of.
///\tparam BASE The base of the log.
//***************************************************************************
template <const size_t N, const size_t BASE>
struct log
{
enum value_type
{
// Recursive definition.
value = (N >= BASE) ? 1 + log<N / 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 N>
struct log2
{
enum value_type
{
value = log<N, 2>::value
};
};
//***************************************************************************
///\ingroup log
/// Calculates base 10 logs.
//***************************************************************************
template <const size_t N>
struct log10
{
enum value_type
{
value = log<N, 10>::value
};
};
//***************************************************************************
///\ingroup exp
/// Calculates powers.
//***************************************************************************
template <const size_t N, const size_t POWER>
struct pow
{
enum value_type
{
value = N * pow<N, POWER - 1>::value
};
};
//***************************************************************************
///\ingroup exp
/// Specialisation for POWER == 0
//***************************************************************************
template <const size_t N>
struct pow<N, 0>
{
enum value_type
{
value = 1
};
};
}
#endif