Elemental::Value< T > Class Template Reference

A qualified value of a generic type. More...

#include <value.hh>

Inheritance diagram for Elemental::Value< T >:

Public Member Functions
template<class S >
	Value (const S &source, Qualifier qualifier=Q_NEUTRAL)
	Constructs a new defined value.
template<class S >
	Value (const Value< S > &source)
	Constructs a new value based on another value.
	Value (Qualifier qualifier=Q_UNK) throw ()
	Constructs a new undefined or default value.
virtual int	compare (const value_base &other) const throw ()
	Compares two qualified values.
Public Member Functions inherited from Elemental::value_base
bool	has_value () const throw ()
	Returns whether the value is defined.
virtual ustring	get_string (const ustring &format=ustring()) const throw ()
	Returns a localized text representation of the value.
ustring	get_tip () const throw ()
	Returns a localized message to be displayed as a tooltip.
void	make_entry (EntriesView &view, const ustring &name, const ustring &format=ustring()) const throw ()
	Possibly adds the result of get_string() to an EntriesView.

Public Attributes
T	value
	The value, if defined.
Public Attributes inherited from Elemental::value_base
Qualifier	qualifier
	The qualification of the value's meaning.

Protected Member Functions
virtual ustring	do_get_string (const ustring &format) const throw ()
	Returns a localized text representation of a defined value.
Protected Member Functions inherited from Elemental::value_base
	value_base (Qualifier qualifier) throw ()
virtual int	compare_base (const value_base &other) const throw ()
	Compares the qualifications of two values.

Additional Inherited Members
Protected Attributes inherited from Elemental::value_base
bool	always
	Whether an undefined value should make an entry.
Static Protected Attributes inherited from Elemental::value_base
static const int	YIELD_COMPARE
	Indicates that comparison should be based on values, not definedness.

Detailed Description

template<class T>
class Elemental::Value< T >

A qualified value of a generic type.

This template requires a class with default and copy constructors and less-than, greater-than, and stream insertion operators. Compiler-generated functions are acceptable.

Constructor & Destructor Documentation

template<class T>

template<class S >

Elemental::Value< T >::Value	(	const S &	source,
		Qualifier	qualifier = Q_NEUTRAL
	)

Constructs a new defined value.

Parameters

source	The initial definition.
qualifier	The qualification of the initial value.

template<class T>

template<class S >

Elemental::Value< T >::Value

(

const Value< S > &

source

)

Constructs a new value based on another value.

Parameters

source

The value to be copied.

template<class T>

Elemental::Value< T >::Value

(

Qualifier

qualifier = Q_UNK

)

throw ()

Constructs a new undefined or default value.

Parameters

qualifier

The qualification of the initial value.

Member Function Documentation

template<class T>

virtual int Elemental::Value< T >::compare ( const value_base &  other ) const throw ()

virtual

Compares two qualified values.

Derived classes may override this function, first calling compare_base, and use a dynamic_cast to check other.

Parameters

other

The qualified value for comparison.

Returns

-1 if this value is undefined or is less than other; 0 if the values are equal; or 1 if other is undefined or this value is greater than other.

Reimplemented from Elemental::value_base.

template<class T>

virtual ustring Elemental::Value< T >::do_get_string ( const ustring &  format ) const throw ()

protectedvirtual

Returns a localized text representation of a defined value.

Derived classes must implement this function to produce a text representation based on the format. It will be called by get_string(), which will then decorate its output as appropriate for the current qualifier. If has_value() is false, the behavior is undefined.

Parameters

format

A compose-style format string. Derived classes may define the number of argument references expected in the string; the default is one. If format is empty, a minimal default should be used.

Returns

A UTF-8 string containing the localized representation.

Implements Elemental::value_base.

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

• libelemental/value.hh