20 SEQAN3_DEPRECATED_HEADER(
"This header is deprecated and will be removed in SeqAn-3.1. Please #include <seqan3/utility/type_traits/lazy_conditional.hpp> or <seqan3/core/detail/is_class_template_declarable.hpp> instead.")
Provides a type trait for verifying valid template declarations.
Provides lazy template instantiation traits.