NAME¶

std::experimental::propagate_const::propagate_const - std::experimental::propagate_const::propagate_const

Synopsis¶

constexpr propagate_const() = default; (1) (library fundamentals TS v2)
constexpr propagate_const( propagate_const&& p ) = (2) (library fundamentals TS v2)
default;
template< class U >
/* see below */ constexpr propagate_const( (3) (library fundamentals TS v2)
propagate_const<U>&& pu );
template< class U > (4) (library fundamentals TS v2)
/* see below */ constexpr propagate_const( U&& u );
propagate_const( const propagate_const& ) = delete; (5) (library fundamentals TS v2)

Let t_ designate the private data member that is the wrapped pointer-like object.

1) Constructs a propagate_const, default-initializing this->t_.
2) Explicitly defaulted move constructor that move constructs this->t_ from p.t_.
3) Initializes this->t_ as if by direct-non-list-initialization from the expression
std::move(pu.t_).
This constructor does not participate in overload resolution unless
std::is_constructible<T, U>::value is true, and is explicit if and only if
std::is_convertible<U, T>::value is false.
4) Initializes this->t_ as if by direct-non-list-initialization with the expression
std::forward<U>(u).
This constructor does not participate in overload resolution unless
std::is_constructible<T, U>::value is true and std::decay_t<U> is not a
specialization of propagate_const. This constructor is explicit if and only if
std::is_convertible<U, T>::value is false.
5) Copy constructor is explicitly deleted. propagate_const is non-copyable.

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 initialize the contained pointer with

Notes¶

In Library Fundamental TS v2 (based on C++14), (4) and (5) are typically implemented
in explicit/non-explicit overload pairs. Since Library Fundamental TS v3 (based on
C++20), they can be implemented in conditional explicit specifiers.