# std::erase, std::erase_if (std::forward_list)

 Defined in header  template< class T, class Alloc, class U > void erase(std::forward_list& c, const U& value); (1) (since C++20) template< class T, class Alloc, class Pred > void erase_if(std::forward_list& c, Pred pred); (2) (since C++20)
1) Erases all elements that compare equal to value from the container. Equivalent to c.remove_if([&](auto& elem) { return elem == value; });
2) Erases all elements that satisfy the predicate pred from the container. Equivalent to c.remove_if(pred);

## Contents

### Parameters

 c - container from which to erase value - value to be removed pred - unary predicate which returns ​true if the element should be erased. The expression pred(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). ​

Linear.

### Notes

Unlike std::forward_list::remove, erase accepts heterogenous types and does not force a conversion to the container's value type before invoking the == operator.