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# std::experimental::propagate_const::propagate_const

From cppreference.com
< cpp‎ | experimental‎ | propagate const

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

### [edit] 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

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