Difference between revisions of "cpp/utility/expected/unexpect t"
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(+ page for std::unexpect_t, std::unexpect) |
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{{dcl begin}} | {{dcl begin}} | ||
{{dcl header|expected}} | {{dcl header|expected}} | ||
| − | {{dcl | num=1 | since=c++23 | 1= | + | {{dcl|num=1|since=c++23|1= |
| − | struct unexpect_t { | + | struct unexpect_t { explicit unexpect_t() = default; }; |
| − | + | ||
| − | }; | + | |
}} | }} | ||
| − | {{dcl | num=2 | since=c++23 | 1= | + | {{dcl|num=2|since=c++23|1= |
| − | inline constexpr unexpect_t unexpect{}; | + | inline constexpr std::unexpect_t unexpect{}; |
}} | }} | ||
{{dcl end}} | {{dcl end}} | ||
| Line 16: | Line 14: | ||
@1@ A tag type for in-place construction of an unexpected value in an {{tt|std::expected}} object. | @1@ A tag type for in-place construction of an unexpected value in an {{tt|std::expected}} object. | ||
| − | @2@ A constant of type {{c|const std::unexpect_t}} which is usually directly passed to a constructor of {{tt|std::expected}} to construct an unexpected value. | + | @2@ A constant of type {{c/core|const std::unexpect_t}} which is usually directly passed to a constructor of {{tt|std::expected}} to construct an unexpected value. |
===Notes=== | ===Notes=== | ||
| − | Like other construction tag types, {{tt|unexpect_t}} is a trivial, empty class with an | + | Like other construction tag types, {{tt|unexpect_t}} is a trivial, empty class with an explicit default constructor. |
===See also=== | ===See also=== | ||
{{dsc begin}} | {{dsc begin}} | ||
| − | {{dsc inc | cpp/utility/expected/dsc constructor}} | + | {{dsc inc|cpp/utility/expected/dsc constructor}} |
| + | {{dsc inc|cpp/utility/dsc in_place}} | ||
{{dsc end}} | {{dsc end}} | ||
{{langlinks|de|es|fr|it|ja|pt|ru|zh}} | {{langlinks|de|es|fr|it|ja|pt|ru|zh}} | ||
Latest revision as of 05:01, 3 November 2024
| Defined in header <expected>
|
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| struct unexpect_t { explicit unexpect_t() = default; }; |
(1) | (since C++23) |
| inline constexpr std::unexpect_t unexpect{}; |
(2) | (since C++23) |
1) A tag type for in-place construction of an unexpected value in an
std::expected object.2) A constant of type const std::unexpect_t which is usually directly passed to a constructor of
std::expected to construct an unexpected value.[edit] Notes
Like other construction tag types, unexpect_t is a trivial, empty class with an explicit default constructor.
[edit] See also
constructs the expected object (public member function) | |
| in-place construction tag (tag) |
