QtlVariable< T > Class Template Reference

A template class which defines a variable which can be either initialized or uninitialized. More...

Public Member Functions
	QtlVariable () throw ()
	Default constructor, the variable is uninitialized. More...
	QtlVariable (const QtlVariable< T > &other)
	Copy constructor. More...
	QtlVariable (const T &obj)
	Constructor from a T instance, the variable is initialized. More...
virtual	~QtlVariable ()
	Virtual destructor. More...
bool	operator!= (const QtlVariable< T > &other) const
	Unequality operator. More...
bool	operator!= (const T &obj) const
	Unequality operator with a T instance. More...
QtlVariable< T > &	operator= (const QtlVariable< T > &other)
	Assignment operator. More...
QtlVariable< T > &	operator= (const T &obj)
	Assignment operator from a T object. More...
bool	operator== (const QtlVariable< T > &other) const
	Equality operator. More...
bool	operator== (const T &obj) const
	Equality operator with a T instance. More...
void	reset ()
	Reset the value. More...
bool	set () const
	Check the presence of a value. More...
const T &	value () const throw (QtlUninitializedException)
	Access the constant T value inside the variable. More...
T &	value () throw (QtlUninitializedException)
	Access the T value inside the variable. More...
T	value (const T &def) const
	Get a copy of the T value inside the variable or a default value. More...

Private Attributes
T *	_access
quint8	_data [sizeof(T)]

Detailed Description

template<typename T>
class QtlVariable< T >

A template class which defines a variable which can be either initialized or uninitialized.

Template Parameters

T	A type or class which describes the content of the variable. The basic requirement on T is the availability of a copy constructor and operators for assignment and equality.

Constructor & Destructor Documentation

QtlVariable() [1/3]

template<typename T >

QtlVariable< T >::QtlVariable ( ) throw ( )

inline

Default constructor, the variable is uninitialized.

QtlVariable() [2/3]

template<typename T >

QtlVariable< T >::QtlVariable

(

const QtlVariable< T > &

other

)

Copy constructor.

This object is in the same state as other. If other is initialized, this object becomes initialized with the same T value.

Parameters

[in]

other

Another instance from which to build this object.

QtlVariable() [3/3]

template<typename T >

QtlVariable< T >::QtlVariable ( const T &  obj )

inline

Constructor from a T instance, the variable is initialized.

Parameters

[in]

obj

The initial value for the variable.

~QtlVariable()

template<typename T >

virtual QtlVariable< T >::~QtlVariable ( )

inlinevirtual

Virtual destructor.

Member Function Documentation

operator=() [1/2]

template<typename T >

QtlVariable< T > & QtlVariable< T >::operator=

(

const QtlVariable< T > &

other

)

Assignment operator.

This object is in the same state as other. If other is initialized, this object becomes initialized with the same T value.

Parameters

[in]

other

Another instance from which to assign this object.

Returns

A reference to this object.

operator=() [2/2]

template<typename T >

QtlVariable< T > & QtlVariable< T >::operator=

(

const T &

obj

)

Assignment operator from a T object.

This object becomes initialized if it was not already.

Parameters

[in]

obj

Value from which to assign this object.

Returns

A reference to this object.

set()

template<typename T >

bool QtlVariable< T >::set ( ) const

inline

Check the presence of a value.

Returns

True if the variable is initialized, false otherwise.

reset()

template<typename T >

void QtlVariable< T >::reset

(

)

Reset the value.

This object becomes uninitialized if it was not already.

value() [1/3]

template<typename T >

const T & QtlVariable< T >::value	(		)	const
throw	(	QtlUninitializedException
	)

Access the constant T value inside the variable.

Returns

A constant reference to the T value inside the variable.

Exceptions

QtlUnitializedException

If the variable is uninitialized.

value() [2/3]

template<typename T >

T & QtlVariable< T >::value	(		)
throw	(	QtlUninitializedException
	)

Access the T value inside the variable.

Returns

A reference to the T value inside the variable.

Exceptions

QtlUnitializedException

If the variable is uninitialized.

value() [3/3]

template<typename T >

T QtlVariable< T >::value ( const T &  def ) const

inline

Get a copy of the T value inside the variable or a default value.

Parameters

[in]

def

A default T value if the variable is uninitialized.

Returns

A copy the T value inside the variable if the variable is initialized, def otherwise.

operator==() [1/2]

template<typename T >

bool QtlVariable< T >::operator== ( const QtlVariable< T > &  other ) const

inline

Equality operator.

Parameters

[in]

other

An other instance to compare with.

Returns

True if both instances are initialized and contain equal values.

operator!=() [1/2]

template<typename T >

bool QtlVariable< T >::operator!= ( const QtlVariable< T > &  other ) const

inline

Unequality operator.

Parameters

[in]

other

An other instance to compare with.

Returns

True if any instance is uninitialized or both are initialized with unequal values.

operator==() [2/2]

template<typename T >

bool QtlVariable< T >::operator== ( const T &  obj ) const

inline

Equality operator with a T instance.

Parameters

[in]

obj

An object to compare with.

Returns

True if this object is initialized and its value is equal to obj.

operator!=() [2/2]

template<typename T >

bool QtlVariable< T >::operator!= ( const T &  obj ) const

inline

Unequality operator with a T instance.

Parameters

[in]

obj

An object to compare with.

Returns

True if this object is uninitialized or its value is not equal to obj.

Member Data Documentation

_access

template<typename T >

T* QtlVariable< T >::_access

private

_data

template<typename T >

quint8 QtlVariable< T >::_data[sizeof(T)]

private

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

• QtlVariable.h
• QtlVariableTemplate.h