Handle clang warnings

The other virtual functions already had override.

`#if` ended up presenting the compiler with preprocessed code that
admittedly looked suspicious, although it is obviously fine if you look
at the original source. Still, the brackets don't hurt much.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/python/include/Alpha_complex_factory.h b/src/python/include/Alpha_complex_factory.h
index 3d20aa8f..41eb72c1 100644
--- a/src/python/include/Alpha_complex_factory.h
+++ b/src/python/include/Alpha_complex_factory.h
@@ -106,7 +106,7 @@ class Exact_alpha_complex_dD final : public Abstract_alpha_complex {
     return alpha_complex_.create_complex(*simplex_tree, max_alpha_square, exact_version_, default_filtration_value);
   }
 
-  virtual std::size_t num_vertices() const {
+  virtual std::size_t num_vertices() const override {
     return alpha_complex_.num_vertices();
   }
 
@@ -141,7 +141,7 @@ class Inexact_alpha_complex_dD final : public Abstract_alpha_complex {
     return alpha_complex_.create_complex(*simplex_tree, max_alpha_square, false, default_filtration_value);
   }
 
-  virtual std::size_t num_vertices() const {
+  virtual std::size_t num_vertices() const override {
     return alpha_complex_.num_vertices();
   }