std::experi...rward_list)(3)

okay bestie, this is the std::experi...rward_list)(3) page from the C++ Standard Libary manual 🌸 — yes, Libary, we are keeping the spelling, it’s part of the lore 💀. This one is the std::forward_list flavor of std::experimental::erase_if, and it’s lowkey iconic.

💖 NAME 💖

std::experimental::erase_if(std::forward_list) — literally std::experimental::erase_if(std::forward_list).

✨ Synopsis ✨

Defined in header <experimental/forward_list>.

template< class T, class Alloc, class Pred >
void erase_if( std::forward_list<T, Alloc>& c, Pred     (library fundamentals TS v2)
          pred );

It erases all elements that satisfy the predicate pred from the container. Equivalent to c.remove_if(pred);. No cap, that’s the whole move.

🎀 Parameters 🎀

• c — container from which to erase. This is the forward_list bestie we’re cleaning up.
• pred — predicate that determines which elements should be erased. It’s the vibe check that decides who stays and who goes.

🔥 Complexity 🔥

Linear. That’s it. Linear. Periodt.

🌈 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 — removes elements satisfying specific criteria
• remove_if — (function template)
• remove — removes elements satisfying specific criteria
• remove_if — (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)

🍓 Category 🍓

• Noindexed pages

mwah 💋 — this cute little page came from http://cppreference.com, version/date 2024.06.10, and it’s the std::experi...rward_list)(3) page. slay, bye bestie 🫶