std::weak_ptr::reset(3)

💅 std::weak_ptr::reset(3) 💅

okay so bestie, this is a page straight outta the C++ Standard Library — that's the std family, the weak_ptr branch specifically, and today we're talking about reset. yes, that reset. the little no-args king that just... lets go. 🫶

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✨ NAME ✨

std::weak_ptr::reset — and yes, the name is literally just std::weak_ptr::reset, she said "my name is my name" and honestly? iconic. 👑

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🌸 Synopsis 🌸

void reset() noexcept;  (since C++11)

so there's no parameters, no overloads, nothing extra — just vibes and noexcept. she's been around (since C++11) and she has never once thrown an exception. lowkey a role model. ✨

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🦋 Description 🦋

Here's the tea, bestie: this function releases the reference to the managed object. that's it, that's the whole plot. 🎀

After the call, *this manages no object. empty. free. unbothered. main character energy but make it a null weak pointer. 💅

ngl it's giving "block and delete" but for a reference count. respectfully. no cap.

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🍓 Parameters 🍓

• (none) — she takes nothing. zero arguments. she doesn't need them. 🙈

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💜 Return value 💜

• (none) — and she returns nothing either. pure action. no receipts. 🧚

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🌈 Example 🌈

// Run this code

#include <iostream>
#include <memory>

int main()
{
    auto shared = std::make_shared<int>(), shared2 = shared, shared3 =
shared2;

    auto weak = std::weak_ptr<int>{shared};

    std::cout << std::boolalpha
              << "shared.use_count(): " << shared.use_count() << '\n'
              << "weak.use_count(): " << weak.use_count() << '\n'
              << "weak.expired(): " << weak.expired() << '\n';

    weak.reset();

    std::cout << "weak.reset();\n"
              << "shared.use_count(): " << shared.use_count() << '\n'
              << "weak.use_count(): " << weak.use_count() << '\n'
              << "weak.expired(): " << weak.expired() << '\n';
}

like look at her go — three shared_ptrs holding hands (shared, shared2, shared3), one lil weak observer watching from the group chat, and then she hits weak.reset() and just 👋 dips. the shared ones don't even notice (their count stays 3, slay), but the weak one goes from 3 to 0 and expired() flips to true. ate. 🔥

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⭐ Output ⭐

shared.use_count(): 3
weak.use_count(): 3
weak.expired(): false
weak.reset();
shared.use_count(): 3
weak.use_count(): 0
weak.expired(): true

the before/after is genuinely so satisfying to look at, i'm obsessed. 😭💖

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👑 See also 👑

• expired — checks whether the referenced object was already deleted (public member function) — basically the vibe check that tells you if the thing you're weakly watching is gone. 💀

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okay that's the whole page, no gatekeeping here 💅 fr fr thanks for reading bestie, mwah 🫶

this lil writeup came to you from http://cppreference.com, dated 2024.06.10, and it's the std::weak_ptr::reset(3) page — catch you in the next manpage, bye bestie! 🌸✨🎀