mrdocs::Polymorphic

Synopsis

Declared in <mrdocs/ADT/Polymorphic.hpp>

template<class T>
class Polymorphic;

Description

This class supports polymorphic objects with value-like semantics.

It implements a tweaked version of std::polymorphic, based on the reference implementation for P3019R14. Differences are: It implements comparison operators with a very project-specific design. Fixed allocator, not parametrizable. No initializer_list constructor.

Deep copies

To copy polymorphic objects, the class uses the copy constructor of the owned derived-type object when copying to another value. Similarly, to allow the correct destruction of derived objects, it uses the destructor of the owned derived-type object in the destructor.

Type Aliases

Name	Description
`const_pointer`	Const pointer to the held object.
`pointer`	Mutable pointer to the held object.
`value_type`	Base value type.

Member Functions

Name	Description
`Polymorphic` [constructor]	Constructors
`~Polymorphic` [destructor]	Destructor.
`operator=`	Assignment operators
`operator*`	Dereference operators
`operator->`	Member access operators
`valueless_after_move`	Return true if the object has been moved-from and is disengaged.

Friends

Name	Description
`mrdocs::swap`
`mrdocs::nullable_traits`	nullable_traits<T> defines how to treat a T as “nullable” without an external engaged bit.

Non-Member Functions

Name	Description
`CompareDerived`	Compares two polymorphic objects that have visit functions
`cast`	Dynamic cast returning const reference; asserts on failure.
`cast`	Dynamic cast returning reference; asserts on failure.
`cast_or_null`	Dynamic cast pointer; returns nullptr when pp is null.
`cast_or_null`	Dynamic cast pointer; returns nullptr when pp is null (const).
`dyn_cast`	Dynamic cast returning pointer or nullptr.
`dyn_cast`	Dynamic cast returning pointer or nullptr (const overload).
`dyn_cast_or_null`	Dynamic cast if pointer is non-null and engaged, else nullptr (const).
`dyn_cast_or_null`	Dynamic cast if pointer is non-null and engaged, else nullptr.
`innerType`	Return the inner type.
`innerType`	Return the inner type.
`innermostType`	Return the innermost type (mutable overload).
`innermostType`	Return the innermost type.
`isa`	Return true if the polymorphic object holds a value of type To.
`isa_or_null`	Return true if pointer is non-null and referent is of type To.
`operator<=>`	Compare polymorphic template arguments.
`operator<=>`	Compare two polymorphic names by visitor dispatch.
`operator<=>`	Compare two polymorphic attributes by visitor dispatch.
`operator<=>`	Compare polymorphic template parameters.
`operator<=>`	Three-way comparison of two polymorphic objects.
`operator<=>`	Compare two polymorphic types by visitor dispatch.
`operator==`	Equality for two polymorphic attributes.
`operator==`	Equality for two polymorphic types.
`operator==`	Equality comparison of two polymorphic objects.
`operator==`	Equality for two polymorphic names.
`operator==`	Equality for polymorphic template arguments.
`operator==`	Equality helper for polymorphic template parameters.
`doc::isEmpty`	Determine if the inline is empty
`doc::isEmpty`	Determine if the inline is empty
`doc::ltrim`	Removes leading whitespace from the inline element.
`doc::ltrim`	Removes leading whitespace from the block.
`doc::operator<=>`	Three-way comparison between polymorphic block wrappers.
`doc::operator<=>`	Three-way comparison for polymorphic inline elements.
`doc::operator==`	Equality delegates to the three-way comparison.
`doc::operator==`	Equality delegates to the three-way comparison.
`doc::rtrim`	Removes trailing whitespace from the block.
`doc::rtrim`	Removes trailing whitespace from the inline element.
`doc::trim`	Removes leading and trailing whitespace from the block.
`doc::trim`	Removes leading and trailing whitespace from the inline element.