std::forward_list::remove, remove_if

 

C++

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Standard library headers

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Regular expressions library (C++11)

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Thread support library (C++11)

 

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std::forward_list

Member functions

forward_list::forward_list

forward_list::~forward_list

forward_list::operator=

forward_list::assign

forward_list::get_allocator

Element access

forward_list::front

Iterators

forward_list::before_beginforward_list::cbefore_begin

forward_list::beginforward_list::cbegin

forward_list::endforward_list::cend

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forward_list::empty

forward_list::max_size

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forward_list::clear

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forward_list::emplace_front

forward_list::pop_front

forward_list::resize

forward_list::swap

Operations

forward_list::merge

forward_list::splice_after

forward_list::removeforward_list::remove_if

forward_list::reverse

forward_list::unique

forward_list::sort

 

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.

Parameters

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

(none)

Complexity

Linear in the size of the container

Example

Run this code

#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';
}

Output:

2 3 10 -1

See also

removeremove_if

removes elements satisfying specific criteria (function template)