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87 lines
5.2 KiB
Plaintext
87 lines
5.2 KiB
Plaintext
namespace Eigen {
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/** \page TopicPreprocessorDirectives Preprocessor directives
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You can control some aspects of Eigen by defining the preprocessor tokens using \c \#define. These macros
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should be defined before any Eigen headers are included. Often they are best set in the project options.
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This page lists the preprocesor tokens recognised by Eigen.
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<b>Table of contents</b>
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- \ref TopicPreprocessorDirectivesMajor
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- \ref TopicPreprocessorDirectivesAssertions
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- \ref TopicPreprocessorDirectivesPerformance
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- \ref TopicPreprocessorDirectivesPlugins
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\section TopicPreprocessorDirectivesMajor Macros with major effects
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- \b EIGEN2_SUPPORT - if defined, enables the Eigen2 compatibility mode. This is meant to ease the transition
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of Eigen2 to Eigen3 (see \ref Eigen2ToEigen3). Not defined by default.
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- \b EIGEN2_SUPPORT_STAGEnn_xxx (for various values of nn and xxx) - staged migration path from Eigen2 to
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Eigen3; see \ref Eigen2SupportModes.
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- \b EIGEN_DEFAULT_TO_ROW_MAJOR - when defined, the default storage order for matrices becomes row-major
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instead of column-major. Not defined by default.
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- \b EIGEN_DEFAULT_DENSE_INDEX_TYPE - the type for column and row indices in matrices, vectors and array
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(DenseBase::Index). Set to \c std::ptrdiff_t by default.
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- \b EIGEN_DEFAULT_IO_FORMAT - the IOFormat to use when printing a matrix if no #IOFormat is specified.
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Defaults to the #IOFormat constructed by the default constructor IOFormat().
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- \b EIGEN_INITIALIZE_MATRICES_BY_ZERO - if defined, all entries of newly constructed matrices and arrays are
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initializes to zero, as are new entries in matrices and arrays after resizing. Not defined by default.
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\section TopicPreprocessorDirectivesAssertions Assertions
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The Eigen library contains many assertions to guard against programming errors, both at compile time and at
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run time. However, these assertions do cost time and can thus be turned off.
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- \b EIGEN_NO_DEBUG - disables Eigen's assertions if defined. Not defined by default, unless the
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\c NDEBUG macro is defined (this is a standard C++ macro which disables all asserts).
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- \b EIGEN_NO_STATIC_ASSERT - if defined, compile-time static assertions are replaced by runtime assertions;
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this saves compilation time. Not defined by default.
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- \b EIGEN_INTERNAL_DEBUGGING - if defined, enables assertions in Eigen's internal routines. This is useful
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for debugging Eigen itself. Not defined by default.
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\section TopicPreprocessorDirectivesPerformance Alignment, vectorization and performance tweaking
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- \b EIGEN_DONT_ALIGN - disables alignment completely. Eigen will not try to align its objects and does not
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expect that any objects passed to it are aligned. This will turn off vectorization. Not defined by default.
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- \b EIGEN_DONT_ALIGN_STATICALLY - disables alignment of arrays on the stack. Not defined by default, unless
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\c EIGEN_DONT_ALIGN is defined.
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- \b EIGEN_DONT_VECTORIZE - disables explicit vectorization when defined. Not defined by default, unless
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alignment is disabled by Eigen's platform test or the user defining \c EIGEN_DONT_ALIGN.
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- \b EIGEN_FAST_MATH - enables some optimizations which might affect the accuracy of the result. The only
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optimization this currently includes is single precision sin() and cos() in the present of SSE
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vectorization. Defined by default.
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- \b EIGEN_UNROLLING_LIMIT - defines the size of a loop to enable meta unrolling. Set it to zero to disable
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unrolling. The size of a loop here is expressed in Eigen's own notion of "number of FLOPS", it does not
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correspond to the number of iterations or the number of instructions. The default is value 100.
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\section TopicPreprocessorDirectivesPlugins Plugins
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It is possible to add new methods to many fundamental classes in Eigen by writing a plugin. As explained in
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the section \ref ExtendingMatrixBase, the plugin is specified by defining a \c EIGEN_xxx_PLUGIN macro. The
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following macros are supported; none of them are defined by default.
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- \b EIGEN_ARRAY_PLUGIN - filename of plugin for extending the Array class.
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- \b EIGEN_ARRAYBASE_PLUGIN - filename of plugin for extending the ArrayBase class.
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- \b EIGEN_CWISE_PLUGIN - filename of plugin for extending the Cwise class.
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- \b EIGEN_DENSEBASE_PLUGIN - filename of plugin for extending the DenseBase class.
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- \b EIGEN_DYNAMICSPARSEMATRIX_PLUGIN - filename of plugin for extending the DynamicSparseMatrix class.
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- \b EIGEN_MATRIX_PLUGIN - filename of plugin for extending the Matrix class.
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- \b EIGEN_MATRIXBASE_PLUGIN - filename of plugin for extending the MatrixBase class.
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- \b EIGEN_PLAINOBJECTBASE_PLUGIN - filename of plugin for extending the PlainObjectBase class.
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- \b EIGEN_QUATERNIONBASE_PLUGIN - filename of plugin for extending the QuaternionBase class.
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- \b EIGEN_SPARSEMATRIX_PLUGIN - filename of plugin for extending the SparseMatrix class.
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- \b EIGEN_SPARSEMATRIXBASE_PLUGIN - filename of plugin for extending the SparseMatrixBase class.
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- \b EIGEN_SPARSEVECTOR_PLUGIN - filename of plugin for extending the SparseVector class.
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- \b EIGEN_TRANSFORM_PLUGIN - filename of plugin for extending the Transform class.
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- \b EIGEN_FUNCTORS_PLUGIN - filename of plugin for adding new functors and specializations of functor_traits.
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*/
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}
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