JLANG::JParameter< T > Class Template Reference

Parameter class. More...

#include <JParameter.hh>

Inheritance diagram for JLANG::JParameter< T >:

Public Types
typedef JClass< T >::argument_type	argument_type
typedef JClass< T >::value_type	value_type

Public Member Functions
	JParameter ()
	Default constructor.
	JParameter (argument_type value)
	Constructor.
JParameter< T > &	operator= (const value_type &value)
	Assignment operator.
const value_type	getValue () const
	Get value of parameter.
void	setValue (const value_type &value)
	Set value.
	operator const value_type () const
	Type conversion operator.
const bool	isDefined () const
	Get status of parameter.
bool	less (const JParameter< T > &parameter) const
	Less than method.

Protected Attributes
T	__value
bool	is_defined

Friends
std::istream &	operator>> (std::istream &in, JParameter< T > &parameter)
	Stream input.
std::ostream &	operator<< (std::ostream &out, const JParameter< T > &parameter)
	Stream output.

Detailed Description

template<class T>
class JLANG::JParameter< T >

Parameter class.

This class is a simple wrapper around the template parameter with an additional status value.
The status value indicates whether the parameter has been defined or not.
A parameter is defined when a value has been assigned or correctly read.
Note that the comparison between parameter objects is based on the philosophy "undefined = any value".
Hence, if any of the two parameter values is undefined, they are considered equal.
The comparison between a parameter object with a template value is based on the internal value of the parameter object via implicit type conversion, regardless of its state.

Definition at line 34 of file JParameter.hh.

Member Typedef Documentation

argument_type

template<class T >

JClass<T>::argument_type JLANG::JParameter< T >::argument_type

Definition at line 39 of file JParameter.hh.

value_type

template<class T >

JClass<T>::value_type JLANG::JParameter< T >::value_type

Definition at line 40 of file JParameter.hh.

Constructor & Destructor Documentation

JParameter() [1/2]

template<class T >

JLANG::JParameter< T >::JParameter ( )

inline

Default constructor.

Definition at line 46 of file JParameter.hh.

                 :
      __value(),
      is_defined(false)
    {}

JParameter() [2/2]

template<class T >

JLANG::JParameter< T >::JParameter ( argument_type value )

inlineexplicit

Constructor.

Parameters

value

value

Definition at line 57 of file JParameter.hh.

                                             :
      __value(value),
      is_defined(true)
    {}

Member Function Documentation

operator=()

template<class T >

JParameter< T > & JLANG::JParameter< T >::operator= ( const value_type & value )

inline

Assignment operator.

Parameters

value

value

Returns

this parameter

Definition at line 69 of file JParameter.hh.

    {
      setValue(value);
 
      return *this;
    }

getValue()

template<class T >

const value_type JLANG::JParameter< T >::getValue ( ) const

inline

Get value of parameter.

Returns

value

Definition at line 82 of file JParameter.hh.

    { 
      return __value; 
    }

setValue()

template<class T >

void JLANG::JParameter< T >::setValue ( const value_type & value )

inline

Set value.

Parameters

value

value

Definition at line 93 of file JParameter.hh.

    {
      __value    = value;
      is_defined = true;
    }

operator const value_type()

template<class T >

JLANG::JParameter< T >::operator const value_type ( ) const

inline

Type conversion operator.

Returns

value

Definition at line 105 of file JParameter.hh.

    { 
      return getValue();
    }

isDefined()

template<class T >

const bool JLANG::JParameter< T >::isDefined ( ) const

inline

Get status of parameter.

Returns

true if value has been defined (by read or assignment); else false

Definition at line 116 of file JParameter.hh.

    {
      return is_defined;
    }

less()

template<class T >

bool JLANG::JParameter< T >::less ( const JParameter< T > & parameter ) const

inline

Less than method.

This method evaluates to true if both parameter values are defined and this value is less than the value of the given parameter object.

Parameters

parameter

parameter

Returns

true if both defined and first value less than second value; else false

Definition at line 131 of file JParameter.hh.

    {
      return this->isDefined() && parameter.isDefined() && this->getValue() < parameter.getValue();
    }

Friends And Related Symbol Documentation

operator>>

template<class T >

std::istream & operator>> ( std::istream & in, JParameter< T > & parameter )

friend

Stream input.

Parameters

in	input stream
parameter	parameter

Returns

input stream

Definition at line 144 of file JParameter.hh.

    {
      in >> parameter.__value;
 
      parameter.is_defined = (bool) in;
 
      return in;
    }

operator<<

template<class T >

std::ostream & operator<< ( std::ostream & out, const JParameter< T > & parameter )

friend

Stream output.

Parameters

out	output stream
parameter	parameter

Returns

output stream

Definition at line 161 of file JParameter.hh.

    {
      if (parameter.is_defined) {
        out << parameter.__value;
      }
      
      return out;
    }

Member Data Documentation

__value

template<class T >

T JLANG::JParameter< T >::__value

protected

Definition at line 172 of file JParameter.hh.

is_defined

template<class T >

bool JLANG::JParameter< T >::is_defined

protected

Definition at line 173 of file JParameter.hh.

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

• JParameter.hh