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61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
#ifndef IGL_LINSPACED_H
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#define IGL_LINSPACED_H
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#include <Eigen/Core>
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// This function is not intended to be a permanent function of libigl. Rather
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// it is a "drop-in" workaround for documented bug in Eigen:
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// http://eigen.tuxfamily.org/bz/show_bug.cgi?id=1383
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//
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// Replace:
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//
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// Eigen::VectorXi::LinSpaced(size,low,high);
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//
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// With:
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//
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// igl::LinSpaced<Eigen::VectorXi>(size,low,high);
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//
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// Specifcally, this version will _always_ return an empty vector if size==0,
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// regardless of the values for low and high. If size != 0, then this simply
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// returns the result of Eigen::Derived::LinSpaced.
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//
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// Until this bug is fixed, we should also avoid calls to the member function
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// `.setLinSpaced`. This means replacing:
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//
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// a.setLinSpaced(size,low,high);
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//
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// with
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//
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// a = igl::LinSpaced<decltype(a) >(size,low,high);
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//
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namespace igl
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{
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template <typename Derived>
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//inline typename Eigen::DenseBase< Derived >::RandomAccessLinSpacedReturnType
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inline Derived LinSpaced(
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typename Derived::Index size,
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const typename Derived::Scalar & low,
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const typename Derived::Scalar & high);
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}
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// Implementation
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template <typename Derived>
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//inline typename Eigen::DenseBase< Derived >::RandomAccessLinSpacedReturnType
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inline Derived
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igl::LinSpaced(
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typename Derived::Index size,
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const typename Derived::Scalar & low,
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const typename Derived::Scalar & high)
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{
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if(size == 0)
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{
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// Force empty vector with correct "RandomAccessLinSpacedReturnType" type.
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return Derived::LinSpaced(0,0,1);
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}else if(high < low)
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{
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return low-Derived::LinSpaced(size,low-low,low-high).array();
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}else{
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return Derived::LinSpaced(size,low,high);
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}
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}
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#endif
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