Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/find_zero.cpp

@@ -0,0 +1,48 @@
+#include "find_zero.h"
+#include "for_each.h"
+#include "any.h"
+
+template <typename AType, typename DerivedI>
+IGL_INLINE void igl::find_zero(
+  const Eigen::SparseMatrix<AType> & A,
+  const int dim,
+  Eigen::PlainObjectBase<DerivedI> & I)
+{
+  assert((dim == 1 || dim == 2) && "dim must be 2 or 1");
+  // Get size of input
+  int m = A.rows();
+  int n = A.cols();
+  // I starts by containing guess where 0 might be
+  I = DerivedI::Zero(dim==1?n:m);
+  Eigen::Array<bool,Eigen::Dynamic,1> found = 
+    Eigen::Array<bool,Eigen::Dynamic,1>::Zero(dim==1?n:m);
+  const auto func = [&I,&found,&dim](int i, int j, const int v)
+  {
+    if(dim == 2)
+    {
+      std::swap(i,j);
+    }
+    // Coded as if dim == 1, assuming swap for dim == 2
+    // Have we already found a zero?
+    if(!found(j))
+    {
+      if(I(j) != i || v == 0)
+      {
+        // either there was an implicit zero between the last element and this
+        // one, or this one is zero
+        found(j) = true;
+      }else
+      {
+        // If not found, then guess that next element will be zero
+        I(j) = I(j)+1;
+      }
+    }
+  };
+  for_each(A,func);
+}
+
+#ifdef IGL_STATIC_LIBRARY
+// Explicit template instantiation
+// generated by autoexplicit.sh
+template void igl::find_zero<bool, Eigen::Matrix<int, -1, 1, 0, -1, 1> >(Eigen::SparseMatrix<bool, 0, int> const&, int, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> >&);
+#endif