std::projected_value_t - cppreference.com (original) (raw)
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.
[edit] Template parameters
| I | - | an indirectly readable type |
|---|---|---|
| Proj | - | projection applied to an lvalue reference to value type of I |
[edit] 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 |
[edit] Example
[edit] See also
| | computes the result of invoking a callable object on the result of dereferencing some set of indirectly_readable types(alias template)[edit] | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | helper template for specifying the constraints on algorithms that accept projections(alias template)[edit] |