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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../iterator/projected_value_t.html below:

std::projected_value_t - cppreference.com

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 [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]

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