SeqAn3  3.0.2
The Modern C++ library for sequence analysis.
debug_stream_optional.hpp
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1 // -----------------------------------------------------------------------------------------------------
2 // Copyright (c) 2006-2020, Knut Reinert & Freie Universität Berlin
3 // Copyright (c) 2016-2020, Knut Reinert & MPI für molekulare Genetik
4 // This file may be used, modified and/or redistributed under the terms of the 3-clause BSD-License
5 // shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
6 // -----------------------------------------------------------------------------------------------------
7 
13 #pragma once
14 
15 #include <optional>
16 
19 
20 namespace seqan3
21 {
31 template <typename optional_type, typename char_t>
35 inline debug_stream_type<char_t> & operator<<(debug_stream_type<char_t> & s, optional_type && SEQAN3_DOXYGEN_ONLY(arg))
36 {
37  s << "<VALUELESS_OPTIONAL>";
38  return s;
39 }
40 
47 template <typename optional_type, typename char_t>
49  requires detail::is_type_specialisation_of_v<remove_cvref_t<optional_type>, std::optional>
52 {
53  if (arg.has_value())
54  s << *arg;
55  else
56  s << "<VALUELESS_OPTIONAL>";
57  return s;
58 }
59 
61 
62 } // namespace seqan3
template_inspection.hpp
Provides seqan3::type_list and auxiliary type traits.
debug_stream_type.hpp
Provides seqan3::debug_stream and related types.
seqan3::debug_stream_type
A "pretty printer" for most SeqAn data structures and related types.
Definition: debug_stream_type.hpp:70
same_as
The concept std::same_as<T, U> is satisfied if and only if T and U denote the same type.
seqan3
The main SeqAn3 namespace.
Definition: aligned_sequence_concept.hpp:35
seqan3::operator<<
debug_stream_type< char_t > & operator<<(debug_stream_type< char_t > &stream, tuple_t &&alignment)
Stream operator for alignments, which are represented as tuples of aligned sequences.
Definition: aligned_sequence_concept.hpp:562
std::nullopt_t
optional