Fix compiler warnings

Author: jlblancoc

examples/matrix_example.cpp

@@ -115,7 +115,7 @@ void kdtree_demo(const size_t nSamples, const size_t dim)
                   << " out_dist_sqr=" << out_dists_sqr[i] << std::endl;
 }
 
-int main(int argc, char** argv)
+int main(int /*argc*/, char** /*argv*/)
 {
     // Randomize Seed
     // srand(static_cast<unsigned int>(time(nullptr)));

examples/utils.h

@@ -182,6 +182,7 @@ struct PointCloud_Orient
     //  "if/else's" are actually solved at compile time.
     inline T kdtree_get_pt(const size_t idx, const size_t dim = 0) const
     {
+        (void)dim;
         return pts[idx].theta;
     }
 

include/nanoflann.hpp

@@ -1808,7 +1808,8 @@ class KDTreeSingleIndexAdaptor
         // Create a permutable array of indices to the input vectors.
         Base::size_ = dataset_.kdtree_get_point_count();
         if (Base::vAcc_.size() != Base::size_) Base::vAcc_.resize(Base::size_);
-        for (Size i = 0; i < Base::size_; i++) Base::vAcc_[i] = i;
+        for (IndexType i = 0; i < static_cast<IndexType>(Base::size_); i++)
+            Base::vAcc_[i] = i;
     }
 
     void computeBoundingBox(BoundingBox& bbox)