vcsn::Element

Element Class Template Reference
[Fundamental C++: the Element design pattern.]

Glue class between structural elements and implementation values. More...

Inheritance diagram for Element:


Public Types
typedef S	set_t
	Structure type for structural elements.
typedef T	value_t
	Implementation type for values.
Public Member Functions
	Element ()
	Default constructor.
	Element (const Element &other)
	Copy constructor from `Element` instances of exactly the same type.
template<typename U>
	Element (const Element< S, U > &other)
	Copy constructor from `Element` instances with different value type.
template<typename OtherS, typename U>
	Element (const Element< OtherS, U > &other)
	Copy constructor from foreign `Element` instances.
	Element (const S &structure)
	Default constructor with the structural element specified.
	Element (const S &structure, const T &other)
	Explicit construction from structural element and value.
template<typename U>
	Element (const S &structure, const U &other)
	Explicit construction from structural element and foreign value.
template<typename OtherS, typename U>
	Element (const S &structure, const Element< OtherS, U > &other)
	Explicit construction with foreign `Element` conversion.
Element &	operator= (const Element &other)
	Assignment from the same `Element` type.
template<typename U>
Element &	operator= (const Element< S, U > &other)
	Assignment from other implementation value types.
template<typename OtherS, typename U>
Element &	operator= (const Element< OtherS, U > &other)
	Assignment from foreign `Element` types.
template<typename U>
Element &	operator= (const U &other)
	Assignment from foreign implementation types.
const S &	structure () const
	Accessor to the structural element.
void	attach (const S &structure)
	Post-construction link to a structural element.

T &	value ()
	Accessor to the value data.
const T &	value () const
	Accessor to the value data.
Static Public Attributes
static const bool	dynamic
	Attribute indicating whether Element instances have run-time data.

Detailed Description

template<typename S, typename T>
class vcsn::Element< S, T >

Glue class between structural elements and implementation values.

Element is the center of the design pattern used in Vaucanson to have an orthogonal construction of object from two different viewpoints:

Algebraic/Theorical one, from a hierarchy of structures,
Implementation and computations.

Element proposes a lot of different constructors so as to allow the largest structure of type conversions. Calling foreign constructors assumes that there exist compatible op_convert() functions.

See also:

Definition at line 61 of file element.hh.

Constructor & Destructor Documentation

Element ( )

Default constructor.

It is not possible to use this contructor when the structural element has dynamic data. If you absolutely need to do so, notice that it may be dangerous, and see misc::Deferrer.