SeqAn3
transformation_trait_or.hpp
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34 
40 #pragma once
41 
42 #include <type_traits>
43 
44 #include <meta/meta.hpp>
45 
46 #include <seqan3/core/platform.hpp>
47 #include <seqan3/std/type_traits>
48 
49 namespace seqan3::detail
50 {
51 
69 template <typename type_t, typename default_t>
70 using transformation_trait_or = std::conditional_t<meta::is_trait<type_t>::value, // check if type_t::type exists
71  type_t, // if yes, return type_t
72  std::type_identity<default_t>>; // else return default_t as trait
73 
78 template <typename type_t, typename default_t>
79 using transformation_trait_or_t = typename transformation_trait_or<type_t, default_t>::type;
80 
81 } // namespace seqan3::detail
Contains platform and dependency checks.
typename transformation_trait_or< type_t, default_t >::type transformation_trait_or_t
Helper type of seqan3::detail::transformation_trait_or.
Definition: transformation_trait_or.hpp:79
Definition: aligned_sequence_concept.hpp:288
Provides C++20 additions to the type_traits header.
The identity transformation (a TransformationTrait that returns the input).
Definition: type_traits:59