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

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C++
Experimental
Library fundamentals v2
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

removes elements satisfying specific criteria
(function template)
removes elements satisfying specific criteria
(public member function of std::forward_list<T,Allocator> )
(library fundamentals 2 TS)
erases all elements equal to a specific value from a std::forward_list
(function template)
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