template<class T, class Allocator, class U = T>
typename list<T, Allocator>::size_type
erase(list<T, Allocator>& c, const U& value);
template<class T, class Allocator, class Predicate>
typename list<T, Allocator>::size_type
erase_if(list<T, Allocator>& c, Predicate pred);