Holder< TYPES > Struct Template Reference

#include "lib/variant-o.hpp"

Description

template<typename TYPES>
struct lib::variant::Holder< TYPES >

internal helper used to build a variant storage wrapper.

Parametrised with a collection of types, it provides functionality to copy a value of one of these types into an internal buffer, while remembering which of these types was used to place this copy. The value can be later on extracted using a visitation like mechanism, which takes a functor class and invokes a function access(T&) with the type matching the current value in storage

Definition at line 71 of file variant-o.hpp.

Classes
struct	Buffer
	Storage to hold the actual value. More...
struct	CasePrepare
	initialise the dispatcher (trampoline) for the case of accessing type T More...
struct	CaseSelect
	provide a dispatcher table based visitation mechanism More...
struct	Deleter
struct	PlacementAdapter

Public Types
enum	{   TYPECNT = count<TYPES>::value ,   SIZE = maxSize<TYPES>::value }
typedef InstantiateWithIndex< TYPES, PlacementAdapter, Buffer >	Storage

Static Public Member Functions
template<class FUNCTOR >
static FUNCTOR::Ret	access (Buffer &buf)
	access the variant's inline buffer, using the configured access functor.

Member Typedef Documentation

Storage

template<typename TYPES >

typedef InstantiateWithIndex< TYPES , PlacementAdapter , Buffer > Storage

Definition at line 118 of file variant-o.hpp.

Member Enumeration Documentation

anonymous enum

template<typename TYPES >

anonymous enum

Enumerator
TYPECNT
SIZE

Definition at line 74 of file variant-o.hpp.

Member Function Documentation

access()

template<typename TYPES >

template<class FUNCTOR >

static FUNCTOR::Ret access ( Buffer &  buf )

inlinestatic

access the variant's inline buffer, using the configured access functor.

Note

the actual accessor instance is created on demand (static)

Todo:

shouldn't this rather be located within the Holder::Storage created by clients??

Definition at line 181 of file variant-o.hpp.

References Holder< TYPES >::CaseSelect< FUNCTOR >::invoke().

Referenced by Holder< TYPES >::CaseSelect< FUNCTOR >::invoke().

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The documentation for this struct was generated from the following file:

• variant-o.hpp