entt::basic_poly< Concept, Len, Align > Class Template Reference

Static polymorphism made simple and within everyone's reach. More...

#include <poly.hpp>

Inheritance diagram for entt::basic_poly< Concept, Len, Align >:

Collaboration diagram for entt::basic_poly< Concept, Len, Align >:

Public Types
using	concept_type = typename Concept::template type<poly_base<basic_poly>>
	Concept type.
using	vtable_type = typename poly_vtable<Concept, Len, Align>::type
	Virtual table type.

Public Member Functions
	basic_poly () noexcept=default
	Default constructor.
template<typename Type, typename... Args>
	basic_poly (std::in_place_type_t< Type >, Args &&...args)
	Constructs a poly by directly initializing the new object.
template<typename Type, typename = std::enable_if_t<!std::is_same_v<std::remove_cv_t<std::remove_reference_t<Type>>, basic_poly>>>
	basic_poly (Type &&value) noexcept
	Constructs a poly from a given value.
const type_info &	type () const noexcept
	Returns the object type if any, type_id<void>() otherwise.
const void *	data () const noexcept
	Returns an opaque pointer to the contained instance.
void *	data () noexcept
	Returns an opaque pointer to the contained instance.
template<typename Type, typename... Args>
void	emplace (Args &&...args)
	Replaces the contained object by creating a new instance directly.
void	reset ()
	Destroys contained object.
	operator bool () const noexcept
	Returns false if a poly is empty, true otherwise.
concept_type *	operator-> () noexcept
	Returns a pointer to the underlying concept.
const concept_type *	operator-> () const noexcept
	Returns a pointer to the underlying concept.
basic_poly	as_ref () noexcept
	Aliasing constructor.
basic_poly	as_ref () const noexcept
	Aliasing constructor.

Friends
struct	poly_base< basic_poly >

Detailed Description

template<typename Concept, std::size_t Len, std::size_t Align>
class entt::basic_poly< Concept, Len, Align >

Static polymorphism made simple and within everyone's reach.

Static polymorphism is a very powerful tool in C++, albeit sometimes cumbersome to obtain.
This class aims to make it simple and easy to use.

Note

Both deduced and defined static virtual tables are supported.
Moreover, the poly class template also works with unmanaged objects.

Template Parameters

Concept	Concept descriptor.
Len	Size of the storage reserved for the small buffer optimization.
Align	Optional alignment requirement.

Definition at line 193 of file poly.hpp.

Member Typedef Documentation

concept_type

template<typename Concept, std::size_t Len, std::size_t Align>

using entt::basic_poly< Concept, Len, Align >::concept_type = typename Concept::template type<poly_base<basic_poly>>

Concept type.

Definition at line 198 of file poly.hpp.

vtable_type

template<typename Concept, std::size_t Len, std::size_t Align>

using entt::basic_poly< Concept, Len, Align >::vtable_type = typename poly_vtable<Concept, Len, Align>::type

Virtual table type.

Definition at line 200 of file poly.hpp.

Constructor & Destructor Documentation

basic_poly() [1/2]

template<typename Concept, std::size_t Len, std::size_t Align>

template<typename Type, typename... Args>

entt::basic_poly< Concept, Len, Align >::basic_poly ( std::in_place_type_t< Type > , Args &&... args )

inlineexplicit

Constructs a poly by directly initializing the new object.

Template Parameters

Type	Type of object to use to initialize the poly.
Args	Types of arguments to use to construct the new instance.

Parameters

args	Parameters to use to construct the instance.

Definition at line 212 of file poly.hpp.

basic_poly() [2/2]

template<typename Concept, std::size_t Len, std::size_t Align>

template<typename Type, typename = std::enable_if_t<!std::is_same_v<std::remove_cv_t<std::remove_reference_t<Type>>, basic_poly>>>

entt::basic_poly< Concept, Len, Align >::basic_poly ( Type && value )

inlinenoexcept

Constructs a poly from a given value.

Template Parameters

Type	Type of object to use to initialize the poly.

Parameters

value

An instance of an object to use to initialize the poly.

Definition at line 222 of file poly.hpp.

Member Function Documentation

as_ref() [1/2]

template<typename Concept, std::size_t Len, std::size_t Align>

basic_poly entt::basic_poly< Concept, Len, Align >::as_ref ( ) const

inlinenodiscardnoexcept

Aliasing constructor.

Returns

A poly that shares a reference to an unmanaged object.

Definition at line 297 of file poly.hpp.

as_ref() [2/2]

template<typename Concept, std::size_t Len, std::size_t Align>

basic_poly entt::basic_poly< Concept, Len, Align >::as_ref ( )

inlinenodiscardnoexcept

Aliasing constructor.

Returns

A poly that shares a reference to an unmanaged object.

Definition at line 289 of file poly.hpp.

data() [1/2]

template<typename Concept, std::size_t Len, std::size_t Align>

const void * entt::basic_poly< Concept, Len, Align >::data ( ) const

inlinenodiscardnoexcept

Returns an opaque pointer to the contained instance.

Returns

An opaque pointer the contained instance, if any.

Definition at line 237 of file poly.hpp.

data() [2/2]

template<typename Concept, std::size_t Len, std::size_t Align>

void * entt::basic_poly< Concept, Len, Align >::data ( )

inlinenodiscardnoexcept

Returns an opaque pointer to the contained instance.

Returns

An opaque pointer the contained instance, if any.

Definition at line 242 of file poly.hpp.

emplace()

template<typename Concept, std::size_t Len, std::size_t Align>

template<typename Type, typename... Args>

void entt::basic_poly< Concept, Len, Align >::emplace ( Args &&... args )

inline

Replaces the contained object by creating a new instance directly.

Template Parameters

Type	Type of object to use to initialize the poly.
Args	Types of arguments to use to construct the new instance.

Parameters

args	Parameters to use to construct the instance.

Definition at line 253 of file poly.hpp.

operator bool()

template<typename Concept, std::size_t Len, std::size_t Align>

entt::basic_poly< Concept, Len, Align >::operator bool ( ) const

inlineexplicitnodiscardnoexcept

Returns false if a poly is empty, true otherwise.

Returns

False if the poly is empty, true otherwise.

Definition at line 268 of file poly.hpp.

operator->() [1/2]

template<typename Concept, std::size_t Len, std::size_t Align>

const concept_type * entt::basic_poly< Concept, Len, Align >::operator-> ( ) const

inlinenodiscardnoexcept

Returns a pointer to the underlying concept.

Returns

A pointer to the underlying concept.

Definition at line 281 of file poly.hpp.

operator->() [2/2]

template<typename Concept, std::size_t Len, std::size_t Align>

concept_type * entt::basic_poly< Concept, Len, Align >::operator-> ( )

inlinenodiscardnoexcept

Returns a pointer to the underlying concept.

Returns

A pointer to the underlying concept.

Definition at line 276 of file poly.hpp.

reset()

template<typename Concept, std::size_t Len, std::size_t Align>

void entt::basic_poly< Concept, Len, Align >::reset ( )

inline

Destroys contained object.

Definition at line 259 of file poly.hpp.

type()

template<typename Concept, std::size_t Len, std::size_t Align>

const type_info & entt::basic_poly< Concept, Len, Align >::type ( ) const

inlinenodiscardnoexcept

Returns the object type if any, type_id<void>() otherwise.

Returns

The object type if any, type_id<void>() otherwise.

Definition at line 229 of file poly.hpp.

Friends And Related Symbol Documentation

poly_base< basic_poly >

template<typename Concept, std::size_t Len, std::size_t Align>

friend struct poly_base< basic_poly >

friend

Definition at line 151 of file poly.hpp.

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The documentation for this class was generated from the following files:

• src/entt/poly/fwd.hpp
• src/entt/poly/poly.hpp