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 80 of file variant-o.hpp.

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. More...

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

Member Function Documentation

access()

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 190 of file variant-o.hpp.

Collaboration diagram for Holder< TYPES >:

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

• variant-o.hpp