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std::list<T,Allocator>::remove, remove_if

void remove( const T& value );		(until C++20)
size_type remove( const T& value );		(since C++20)
template< class UnaryPredicate > void remove_if( UnaryPredicate p );		(until C++20)
template< class UnaryPredicate > size_type remove_if( UnaryPredicate p );		(since C++20)

Removes all elements satisfying specific criteria. The first version removes all elements that are equal to value, the second version removes all elements for which predicate p returns true.

Parameters

value	-	value of the elements to remove
p	-	unary predicate which returns `true` if the element should be removed. The expression `p(v)` must be convertible to `bool` for every argument `v` of type (possibly const) `T`, regardless of value category, and must not modify `v`. Thus, a parameter type of `T&`is not allowed, nor is `T` unless for `T` a move is equivalent to a copy (since C++11).

Return value

(none).	(until C++20)
The number of elements removed.	(since C++20)

Complexity

Linear in the size of the container.

Example

#include <list>
#include <iostream>
 
int main()
{
    std::list<int> l = { 1,100,2,3,10,1,11,-1,12 };
 
    l.remove(1); // remove both elements equal to 1
    l.remove_if([](int n){ return n > 10; }); // remove all elements greater than 10
 
    for (int n : l) {
        std::cout << n << ' '; 
    }
    std::cout << '\n';
}

Output:

2 3 10 -1

std::list<T,Allocator>::remove, remove_if

Parameters

Return value

Complexity

Example

See also