HelenOS sources

is_empty          185 uspace/lib/cpp/include/__bits/memory/type_getters.hpp     struct alloc_get_always_equal: aux::type_is<typename is_empty<T>::type>
is_empty          563 uspace/lib/cpp/include/__bits/type_traits/type_traits.hpp     inline constexpr bool is_empty_v = is_empty<T>::value;
is_empty          252 uspace/lib/cpp/src/__bits/test/memory.cpp             std::is_same_v<typename dummy_traits1::is_always_equal, typename std::is_empty<aux::dummy_allocator1>::type>