PR Summary

Noted this warning while recompiling which lead to the comment about isnan and since we now require C++ 11 anyway...

  In file included from src/_path_wrapper.cpp:3:0:
  src/_path_wrapper.cpp: In function ‘Py_is_sorted(_object*, _object*)’:
  src/_path.h:1275:17: warning: ‘last_value’ may be used uninitialized in this function [-Wmaybe-uninitialized]
                   if (current_value < last_value) {
                   ^
  src/_path.h:1253:11: note: ‘last_value’ was declared here
           T last_value;
             ^

The warning seems to be a false positive, but I guess there is limited harm in initializing the variable.

Edit: it seems like newer compilers do not warn for this, but I guess that they then also can detect that the initialization is a nop anyway?

PR Checklist

Documentation and Tests

• Has pytest style unit tests (and pytest passes)
• Documentation is sphinx and numpydoc compliant (the docs should build without error).
• New plotting related features are documented with examples.

Release Notes

• New features are marked with a .. versionadded:: directive in the docstring and documented in doc/users/next_whats_new/
• API changes are marked with a .. versionchanged:: directive in the docstring and documented in doc/api/next_api_changes/
• Release notes conform with instructions in next_whats_new/README.rst or next_api_changes/README.rst