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std::is_partitioned

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is_partitioned
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Defined in header <algorithm>
template< class InputIt, class UnaryPred >
bool is_partitioned( InputIt first, InputIt last, UnaryPred p );
 (1) (since C++11)
(constexpr since C++20)
template< class ExecutionPolicy, class ForwardIt, class UnaryPred >

bool is_partitioned( ExecutionPolicy&& policy,

                     ForwardIt first, ForwardIt last, UnaryPred p );
 (2) (since C++17)
1) Checks whether [first, last) is partitioned by the predicate p: all elements satisfy p appear before all elements that do not.
2) Same as (1), but executed according to policy.
This overload participates in overload resolution only if all following conditions are satisfied:

std::is_execution_policy_v<std::decay_t<ExecutionPolicy>> is true.

(until C++20)

std::is_execution_policy_v<std::remove_cvref_t<ExecutionPolicy>> is true.

(since C++20)

Contents

[edit] Parameters

first, last - the pair of iterators defining the range of elements to examine
policy - the