std::projected_value_t
From cppreference.com
| Defined in header <iterator>
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| template< std::indirectly_readable I, std::indirectly_regular_unary_invocable<I> Proj > |
(since C++26) | |
The alias template projected_value_t obtains the value type by stripping any reference and its topmost cv-qualifiers of the result type of applying Proj to std::iter_value_t<I>&.
projected_value_t is used to determine the default value type in some algorithms such as ranges::contains.
Template parameters
| I | - | an indirectly readable type |
| Proj | - | projection applied to an lvalue reference to value type of I
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Notes
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_algorithm_default_value_type |
202403L |
(C++26) | default template type for algorithm values using std::projected_value_t
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Example
| This section is incomplete Reason: no example |
See also
| (C++20) |
computes the result of invoking a callable object on the result of dereferencing some set of indirectly_readable types(alias template) |
| (C++20) |
helper template for specifying the constraints on algorithms that accept projections (class template) |