libcruft-util/matrix2.cpp

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/*
* 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.
*
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
*/
#include "matrix.hpp"
using util::matrix;
///////////////////////////////////////////////////////////////////////////////
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template <size_t Rows, size_t Cols, typename T>
T
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util::determinant (const matrix<Rows,Cols,T> &m)
{
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static_assert (Rows == 2 && Cols == 2);
return m[0][0] * m[1][1] - m[0][1] * m[1][0];
}
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template float util::determinant (const matrix<2,2,float>&);
template double util::determinant (const matrix<2,2,double>&);
///////////////////////////////////////////////////////////////////////////////
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template <size_t Rows, size_t Cols, typename T>
matrix<Rows,Cols,T>
util::inverse (const matrix<Rows,Cols,T> &m)
{
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static_assert (Rows == 2 && Cols == 2);
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return matrix<2,2,T> {
m[1][1], -m[0][1],
-m[1][0], m[0][0]
} / determinant (m);
}
//-----------------------------------------------------------------------------
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template util::matrix<2,2,float> util::inverse (const matrix<2,2,float>&);
template util::matrix<2,2,double> util::inverse (const matrix<2,2,double>&);
///////////////////////////////////////////////////////////////////////////////
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template struct util::matrix<2,2,float>;
template struct util::matrix<2,2,double>;