Defined in header
template< class BidirIt, class UnaryPredicate >
BidirIt stable_partition( BidirIt first, BidirIt last, UnaryPredicate p );
template< class ExecutionPolicy, class BidirIt, class UnaryPredicate >
BidirIt stable_partition( ExecutionPolicy&& policy, BidirIt first, BidirIt last, UnaryPredicate p );
[first, last)in such a way that all elements for which the predicate
preturns true precede the elements for which predicate
preturns false. Relative order of the elements is preserved.
policy. This overload does not participate in overload resolution unless std::is_execution_policy_v<std::decay_t<ExecutionPolicy>> (until C++20) std::is_execution_policy_v<std::remove_cvref_t<ExecutionPolicy>> (since C++20) is true.
|first, last||-||the range of elements to reorder|
|policy||-||the execution policy to use. See execution policy for details.|
|p||-|| unary predicate which returns true if the element should be ordered before other elements. |
The expression p(v) must be convertible to bool for every argument
| -The type of dereferenced |
 Return value
Iterator to the first element of the second group
Given N = std::distance(first, last),
Napplications of the predicate and
O(N)swaps if there is enough extra memory. If memory is insufficient, at most
N log Nswaps.
O(N log N)swaps and
O(N)applications of the predicate
The overload with a template parameter named
ExecutionPolicy reports errors as follows:
- If execution of a function invoked as part of the algorithm throws an exception and
ExecutionPolicyis one of the standard policies, std::terminate is called. For any other
ExecutionPolicy, the behavior is implementation-defined.
- If the algorithm fails to allocate memory, std::bad_alloc is thrown.
This function attempts to allocate a temporary buffer. If the allocation fails, the less efficient algorithm is chosen.
Implementations in libc++ and libstdc++ also accept ranges denoted by LegacyForwardIterators as an extension.
3 2 4 5 7 0 0 0 0
 See also
| divides a range of elements into two groups |
| divides elements into two groups while preserving their relative order |