Explicity disallow get_idx for boolean type, to avoid ambiguity with a map.
Explicity disallow get_idx for boolean type, to avoid ambiguity with a map.

gradecam/yaml-cpp,gradecam/yaml-cpp,gradecam/yaml-cpp,gradecam/yaml-cpp,Astron/yaml-cpp,Astron/yaml-cpp,Astron/yaml-cpp,Astron/yaml-cpp