std::visit_format_arg
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C++
Text processing library
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| Regular expressions library (C++11) | |||||||||||||||||||||||||
| Formatting library (C++20) | |||||||||||||||||||||||||
| Null-terminated sequence utilities | |||||||||||||||||||||||||
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| Text encoding identifications | |||||||||||||||||||||||||
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Formatting library
| Standard format specification | ||||
| Formatting functions | ||||
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| Format strings | ||||
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(C++26) | ||||
| Formatting concepts | ||||
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| Formatter | ||||
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(C++20)(C++20)(C++20) | ||||
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| Formatting arguments | ||||
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visit_format_arg (C++20) (deprecated in C++26) | ||||
(C++20)(C++20) | ||||
| Format error | ||||
(C++20) |
| Defined in header <format>
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| template< class Visitor, class Context > /* see below */ visit_format_arg( Visitor&& vis, std::basic_format_arg<Context> arg ); |
(since C++20) (deprecated in C++26) |
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Applies the visitor vis to the object contained in arg.
Equivalent to std::visit(std::forward<Visitor>(vis), value), where value is the std::variant stored in arg.
Contents |
[edit] Parameters
| vis | - | a Callable that accepts every possible alternative from arg
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| arg | - | a std::basic_format_arg to be visited |
[edit] Return value
The value returned by the selected invocation of the visitor.
[edit] Notes
As of C++26, std::visit_format_arg is deprecated in favor of the visit member functions of std::basic_format_arg.
[edit] Example
| This section is incomplete Reason: no example |
[edit] See also
| (C++20)(C++20) |
creates a type-erased object referencing all formatting arguments, convertible to format_args (function template) [edit] |
