std::experi...t::operator=(3)

🌸 std::experi...t::operator=(3) 🌸

okay bestie, welcome to std::experi...t::operator=(3), straight out of the C++ Standard Libary manual. This page is all about assignment for std::experimental::propagate_const, and the NAME is literally std::experimental::propagate_const::operator= — say it with me. 💅

✨ NAME ✨

std::experimental::propagate_const::operator= — yep, that's the whole name, iconic and slightly mysterious.

🌀 Synopsis 🌀

Here's the synopsis exactly as the page lays it out, bestie — don't let the line wrapping jump-scare you:

          constexpr propagate_const& operator=(               (1) (library
       fundamentals TS v2)
          propagate_const&& p ) = default;
          template< class U >
          constexpr propagate_const& operator=(               (2) (library
       fundamentals TS v2)
          propagate_const<U>&& pu );
          template< class U >                                 (3) (library
       fundamentals TS v2)
          constexpr propagate_const& operator=( U&& u );
          propagate_const& operator=( const propagate_const&  (4) (library
       fundamentals TS v2)
          ) = delete;

First, let t_ designate the private data member that is the wrapped pointer-like object. Got it? Good. Now the numbered lore:

1. This one is an explicitly defaulted move assignment operator that move assigns this->t_ from p.t_.
2. Assigns std::move(pu.t_) to this->t_. This overload participates in overload resolution only if U is implicitly convertible to T.
3. Assigns std::forward<U>(u) to this->t_. This overload participates in overload resolution only if U is implicitly convertible to T and std::decay_t<U> is not a specialization of propagate_const.
4. Copy assignment operator is explicitly deleted. propagate_const is non-copyable. No cap, no copying, periodt. 💀

🎀 Parameters 🎀

• p — another propagate_const object to move from
• pu — another propagate_const object of a different specialization to move from
• u — another object to assign to the contained pointer

🫶 Return value 🫶

The return value is *this.

Sign-off time, bestie: this page's source/version is http://cppreference.com, dated 2024.06.10, and its page id is std::experi...t::operator=(3). Stay slaying 💖✨