std::projected_value_t
Defined in header <iterator> | ||
|---|---|---|
template< std::indirectly_readable I,
std::indirectly_regular_unary_invocable<I> Proj >
using projected_value_t =
std::remove_cvref_t<std::invoke_result_t<Proj&, std::iter_value_t<I>&>>;
| (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 |
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 |
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) |
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