folly::propagate_const

Synopsis

Declared in <folly/lang/PropagateConst.h>

template<typename Pointer>
class propagate_const;

Mimics std::experimental::propagate_const from C++ Library Fundamentals TS v2: accessing the pointee through a const wrapper yields const access.

Name	Description
`element_type`	The type of the object pointed to by `Pointer`.

Name	Description
`propagate_const` [constructor]	Constructors
`operator=`	Assignment operators
`get`	`get` overloads
`operator*`	Dereference operators
`operator->`	Member access operators
`swap`	Swap the underlying pointer with another wrapper's.
`operator bool`	Test whether the underlying pointer is non-null.
`operator element_type const*`	Implicitly convert to a const pointer to the pointed-to object.
`operator element_type*`	Implicitly convert to a mutable pointer to the pointed-to object.

Name	Description
`folly::propagate_const`	A const-propagating wrapper around a pointer-like type.
`folly::get_underlying`	Grants the const free `get_underlying` access to the stored pointer.
`folly::get_underlying`	Grants the free `get_underlying` access to the stored pointer.

Name	Description
`get_underlying`	Access the underlying pointer stored in a const wrapper.
`get_underlying`	Access the underlying pointer stored in a mutable wrapper.
`operator<=>`	Three-way-compare two wrappers by their underlying pointers.
`operator<=>`	Three-way-compare a wrapper against a value of another type.
`operator==`	Equality-compare a wrapper against `nullptr`.
`operator==`	Equality-compare two wrappers by their underlying pointers.
`operator==`	Equality-compare a wrapper against a value of another type.
`swap`	Swap the underlying pointers of two wrappers.