cmake HAVE_NULLPTR examples

lagadic/visp cmake/VISPDetectCXXStandard.cmake :48 

mark_as_advanced(HAVE_NULLPTR)

lagadic/visp cmake/VISPDetectCXXStandard.cmake :200 

mark_as_advanced(HAVE_NULLPTR)

mapcrafter/mapcrafter src/mapcraftercore/CMakeLists.txt :3 

CHECK_CXX_SOURCE_COMPILES("int main() { void* p = nullptr; }" HAVE_NULLPTR)