std::forward_list::remove, remove_if


void remove( const T& value );
(since C++11)
template< class UnaryPredicate >
void remove_if( UnaryPredicate p );
(since C++11)

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.


value - value of the elements to remove
p - unary predicate which returns ​true if the element should be removed.

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 forward_list<T,Allocator>::const_iterator can be dereferenced and then implicitly converted to Type. ​

Return value



Linear in the size of the container


#include <forward_list>
#include <iostream>
int main()
    std::forward_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';


2 3 10 -1

See also

removes elements satisfying specific criteria
(function template)