std::experimental::propagate_const<T>::propagate_const
From cppreference.com
< cpp | experimental | propagate const
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Experimental
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals TS v2)
Library fundamentals 3 (library fundamentals TS v3)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Extensions for concurrency 2 (concurrency TS v2)
Concepts (concepts TS)
Ranges (ranges TS)
Reflection (reflection TS)
Mathematical special functions (special functions TR)
std::experimental::propagate_const
Member functions
propagate_const::propagate_const
Observers
Non-member functions
Helper classes
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)
/* see below */ constexpr propagate_const( propagate_const<U>&& pu );
template< class U >
/* see below */ constexpr propagate_const( U&& 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
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
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.[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
[edit] 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.