std::stable_partition

Defined in header `<algorithm>`
template< class BidirIt, class UnaryPredicate > BidirIt stable_partition( BidirIt first, BidirIt last, UnaryPredicate p );

Reorders the elements in the range [first, last) in such a way that all elements for which the predicate p returns true precede the elements for which predicate p returns false. Relative order of the elements is preserved.

Parameters

first, last	-	the range of elements to reorder
p	-	unary predicate which returns `true` if the element should be ordered before other elements. The signature of the predicate function should be equivalent to the following: `bool pred(const Type &a);` The signature does not need to have `const &`, but the function must not modify the objects passed to it. The type `Type` must be such that an object of type `BidirIt` can be dereferenced and then implicitly converted to `Type`.
Type requirements
- `BidirIt` must meet the requirements of `ValueSwappable` and `BidirectionalIterator`.
-The type of dereferenced `BidirIt` must meet the requirements of `MoveAssignable` and `MoveConstructible`.
- `UnaryPredicate` must meet the requirements of `Predicate`.

Return value

Iterator to the first element of the second group.

Complexity

Exactly last-first applications of the predicate and at most (last-first)*log(last-first) swaps if there is insufficient memory or linear number of swaps if sufficient memory is available.

Notes

This function attempts to allocate a temporary buffer, typically by calling std::get_temporary_buffer. If the allocation fails, the less efficient algorithm is chosen.

Example

#include <iostream>
#include <algorithm>
#include <vector>
 
int main()
{
    std::vector<int> v{0, 0, 3, 0, 2, 4, 5, 0, 7};
    std::stable_partition(v.begin(), v.end(), [](int n){return n>0;});
    for (int n : v) {
        std::cout << n << ' ';
    }
    std::cout << '\n';
}

Output:

3 2 4 5 7 0 0 0 0

partition	divides a range of elements into two groups (function template)
std::experimental::parallel::stable_partition (parallelism TS)	parallelized version of `std::stable_partition` (function template)