# std::experimental::erase_if (std::forward_list)

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< cpp‎ | experimental

Defined in header `<experimental/forward_list>` |  |
template< class T, class Alloc, class Pred > void erase_if( std::forward_list<T, Alloc>& c, Pred pred ); |  | (library fundamentals TS v2)

Erases all elements that satisfy the predicate pred from the container. Equivalent to c.remove_if(pred);.

### Parameters

c | - | container from which to erase
pred | - | predicate that determines which elements should be erased

### Complexity

Linear.

### Example

Run this code

    #include <experimental/forward_list>
    #include <iostream>

    template<typename Os, typename Container>
    inline Os& operator<<(Os& os, Container const& container)
    {
        os << "{ ";
        for (const auto& item : container)
            os << item << ' ';
        return os << "}";
    }

    int main()
    {
        std::forward_list<int> data{3, 3, 4, 5, 5, 6, 6, 7, 2, 1, 0};
        std::cout << "Original:\n" << data << '\n';
        auto divisible_by_3 = [](auto const& x) { return (x % 3) == 0; };
        std::experimental::erase_if(data, divisible_by_3);
        std::cout << "Erase all items divisible by 3:\n" << data << '\n';
    }

Output:

    Original:
    { 3 3 4 5 5 6 6 7 2 1 0 }
    Erase all items divisible by 3:
    { 4 5 5 7 2 1 }

### See also

remove remove_if | removes elements satisfying specific criteria (function template)
remove remove_if (C++11) | removes elements satisfying specific criteria (public member function of `std::forward_list<T,Allocator>`)
erase (std::forward_list) (library fundamentals 2 TS) | erases all elements equal to a specific value from a std::forward_list (function template)

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