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Added pow<> template

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Compile time calculation of powers.
This commit is contained in:
jwellbelove 2014-10-27 11:31:16 +00:00
parent 487671a024
commit ed9e56ef6d
2 changed files with 192 additions and 2 deletions
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30
math.h
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@ -87,7 +87,7 @@ namespace etl
/// Calculates base 2 logs.
//***************************************************************************
template <const size_t N>
struct Log2
struct log2
{
enum value_type
{
@ -100,13 +100,39 @@ namespace etl
/// Calculates base 10 logs.
//***************************************************************************
template <const size_t N>
struct Log10
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

164
test/test_math.cpp Normal file
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@ -0,0 +1,164 @@
/******************************************************************************
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.
******************************************************************************/
#include <UnitTest++/UnitTest++.h>
#include "../math.h"
namespace
{
SUITE(TestMath)
{
//*************************************************************************
TEST(TestLog0_BASE)
{
int actual;
actual = etl::log<0, 2>::value;
CHECK_EQUAL(0, actual);
actual = etl::log<0, 10>::value;
CHECK_EQUAL(0, actual);
}
//*************************************************************************
TEST(TestLog1_BASE)
{
int actual;
actual = etl::log<1, 2>::value;
CHECK_EQUAL(0, actual);
actual = etl::log<1, 10>::value;
CHECK_EQUAL(0, actual);
}
//*************************************************************************
TEST(TestLog10_BASE)
{
int actual;
actual = etl::log<10, 2>::value;
CHECK_EQUAL(3, actual);
actual = etl::log<10, 10>::value;
CHECK_EQUAL(1, actual);
}
//*************************************************************************
TEST(TestLog100_BASE)
{
int actual;
actual = etl::log<100, 2>::value;
CHECK_EQUAL(6, actual);
actual = etl::log<100, 10>::value;
CHECK_EQUAL(2, actual);
}
//*************************************************************************
TEST(TestLog2)
{
int actual;
actual = etl::log2<0>::value;
CHECK_EQUAL(0, actual);
actual = etl::log2<1>::value;
CHECK_EQUAL(0, actual);
actual = etl::log2<10>::value;
CHECK_EQUAL(3, actual);
actual = etl::log2<100>::value;
CHECK_EQUAL(6, actual);
}
//*************************************************************************
TEST(TestLog10)
{
int actual;
actual = etl::log10<0>::value;
CHECK_EQUAL(0, actual);
actual = etl::log10<1>::value;
CHECK_EQUAL(0, actual);
actual = etl::log10<10>::value;
CHECK_EQUAL(1, actual);
actual = etl::log10<100>::value;
CHECK_EQUAL(2, actual);
actual = etl::log10<100>::value;
CHECK_EQUAL(2, actual);
}
//*************************************************************************
TEST(TestPow)
{
int actual;
// 2^1
actual = etl::pow<2, 1>::value;
CHECK_EQUAL(2, actual);
// 3^2
actual = etl::pow<3, 2>::value;
CHECK_EQUAL(9, actual);
// 4^3
actual = etl::pow<4, 3>::value;
CHECK_EQUAL(64, actual);
// 5^4
actual = etl::pow<5, 4>::value;
CHECK_EQUAL(625, actual);
// 6^5
actual = etl::pow<6, 5>::value;
CHECK_EQUAL(7776, actual);
// 7^6
actual = etl::pow<7, 6>::value;
CHECK_EQUAL(117649, actual);
// 8^7
actual = etl::pow<8, 7>::value;
CHECK_EQUAL(2097152, actual);
// 9^8
actual = etl::pow<9, 8>::value;
CHECK_EQUAL(43046721, actual);
// 10^9
actual = etl::pow<10, 9>::value;
CHECK_EQUAL(1000000000, actual);
}
};
}