Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/for_each.h

@@ -0,0 +1,78 @@
+#ifndef IGL_FOR_EACH_H
+#define IGL_FOR_EACH_H
+#include "igl_inline.h"
+#include <Eigen/Core>
+#include <Eigen/Sparse>
+namespace igl
+{
+  // FOR_EACH  Call a given function for each non-zero (i.e., explicit value
+  // might actually be ==0) in a Sparse Matrix A _in order (of storage)_. This is
+  // useless unless func has _side-effects_.
+  //
+  // Inputs:
+  //   A  m by n SparseMatrix
+  //   func  function handle with prototype "compatible with" `void (Index i,
+  //     Index j, Scalar & v)`. Return values will be ignored.
+  //
+  // See also: std::for_each
+  template <typename AType, typename Func>
+  inline void for_each(
+    const Eigen::SparseMatrix<AType> & A,
+    const Func & func);
+  template <typename DerivedA, typename Func>
+  inline void for_each(
+    const Eigen::DenseBase<DerivedA> & A,
+    const Func & func);
+}
+
+// Implementation
+
+template <typename AType, typename Func>
+inline void igl::for_each(
+  const Eigen::SparseMatrix<AType> & A,
+  const Func & func)
+{
+  // Can **not** use parallel for because this must be _in order_
+  // Iterate over outside
+  for(int k=0; k<A.outerSize(); ++k)
+  {
+    // Iterate over inside
+    for(typename Eigen::SparseMatrix<AType>::InnerIterator it (A,k); it; ++it)
+    {
+      func(it.row(),it.col(),it.value());
+    }
+  }
+}
+
+template <typename DerivedA, typename Func>
+inline void igl::for_each(
+  const Eigen::DenseBase<DerivedA> & A,
+  const Func & func)
+{
+  // Can **not** use parallel for because this must be _in order_
+  if(A.IsRowMajor)
+  {
+    for(typename DerivedA::Index i = 0;i<A.rows();i++)
+    {
+      for(typename DerivedA::Index j = 0;j<A.cols();j++)
+      {
+        func(i,j,A(i,j));
+      }
+    }
+  }else
+  {
+    for(typename DerivedA::Index j = 0;j<A.cols();j++)
+    {
+      for(typename DerivedA::Index i = 0;i<A.rows();i++)
+      {
+        func(i,j,A(i,j));
+      }
+    }
+  }
+  
+}
+
+//#ifndef IGL_STATIC_LIBRARY
+//#  include "for_each.cpp"
+//#endif
+#endif