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..
SPDX-License-Identifier: BSD-3-Clause
Copyright Contributors to the OpenEXR Project.
Matrix22
########
.. code-block::
#include <Imath/ImathMatrix.h>
The ``Matrix22`` class template represents a 2x2 matrix, with
predefined typedefs for ``float`` and ``double``.
There are also various utility functions that operate on matrices
defined in ``ImathMatrixAlgo.h`` and described in :ref:`Matrix
Functions <matrix-functions>`.
Individual components of a matrix ``M`` may be referenced as either
``M[j][i]`` or ``M.x[j][i]``. While the latter is a little awkward, it has an
advantage when used in loops that may be auto-vectorized or explicitly
vectorized by ``#pragma omp simd`` or other such hints, because the function
call and pointer casting of ``operator[]`` can confuse the compiler just
enough to prevent vectorization of the loop, whereas directly addressing the
real underlying array (``M.x[j][i]``) does not.
Example:
.. literalinclude:: ../examples/Matrix22.cpp
:language: c++
.. doxygentypedef:: M22f
.. doxygentypedef:: M22d
.. doxygenclass:: Imath::Matrix22
:undoc-members:
:members:
.. doxygenfunction:: operator<<(std::ostream& s, const Matrix22<T>& m)
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