---

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

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

Inheritance diagram for vcsn::Element:

[legend]List of all members.

Public Types
typedef S	set_t
	Structure type for structural elements.
typedef T	value_t
	Implementation type for values.
Public Methods
	Element ()
	Default constructor. More...
	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. More...
	Element (const S &set)
	Default constructor with the structural element specified. More...
	Element (const S &set, const T &other)
	Explicit construction from structural element and value.
template<typename U>	Element (const S &set, const U &other)
	Explicit construction from structural element and foreign value.
template<typename OtherS, typename U>	Element (const S &set, 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 &	set () const
	Accessor to the structural element.
void	attach (const S &set)
	Post-construction link to a structural element.
bool	bound () const
	Tell whether the Element instance is linked or not.
	Element (const T &other)
	Copy constructor from anonymous values. More...
template<typename U>	Element (const U &other)
	Copy constructor from anonymous values. More...
T &	value ()
	Accessor to the value data.
const T &	value () const
	Accessor to the value data.
Static Public Attributes
const bool	dynamic
	Attribute indicating whether Element instances have run-time data. More...

---

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 sets,
• Implementation and computations.

Element proposes a lot of different constructors so as to allow the largest set of type conversions. Calling foreign constructors assume that there exist compatible "op_convert" functions.

See also:

• MetaElement
• Structure
• SetSlot

---

Constructor & Destructor Documentation

Element (    )  [inline]

Default constructor. Note that using this constructor when the structural element is dynamic, leaves the constructed Element instance in an incomplete state, i.e. not linked to any structural element.

Element (  const Element< OtherS, U > &    other )  [inline]

Copy constructor from foreign Element instances. Note that using this constructor when the structural element is dynamic, leaves the constructed Element instance in an incomplete state, i.e. not linked to any structural element.

Element (  const T &    other )  [inline]

Copy constructor from anonymous values. Note that using this constructor when the structural element is dynamic, leaves the constructed Element instance in an incomplete state, i.e. not linked to any structural element.

Element (  const U &    other )  [inline]

Copy constructor from anonymous values. Note that using this constructor when the structural element is dynamic, leaves the constructed Element instance in an incomplete state, i.e. not linked to any structural element.

Element (  const S &    set )  [inline, explicit]

Default constructor with the structural element specified. This constructor invokes the default constructor of the implementation value type.

---

Member Data Documentation

const bool dynamic [static]

Initial value: dynamic_traits<S>::ret || MetaElement<S, T>::dynamic_value Attribute indicating whether Element instances have run-time data.

---