JLANG::JMultiComparable< JClass_t, JTypelist_t > Struct Template Reference

Template definition of auxiliary base class for composite data structures composed of base classes with comparisons capabilities. More...

#include <JMultiComparable.hh>

Inheritance diagram for JLANG::JMultiComparable< JClass_t, JTypelist_t >:

Static Protected Member Functions
template<class JHead_t , class JTail_t >
static bool	lt (const JClass_t &first, const JClass_t &second, const JType< JTypeList< JHead_t, JTail_t > > &type)
	Less than method for composite data types.
template<class JHead_t >
static bool	lt (const JClass_t &first, const JClass_t &second, const JType< JTypeList< JHead_t, JNullType > > &type)
	Less than method for composite data types.

Friends
bool	operator< (const JClass_t &first, const JClass_t &second)
	Less than operator.
bool	operator> (const JClass_t &first, const JClass_t &second)
	Greater than operator.
bool	operator<= (const JClass_t &first, const JClass_t &second)
	Less than or equal operator.
bool	operator>= (const JClass_t &first, const JClass_t &second)
	Greater than or equal operator.
bool	operator== (const JClass_t &first, const JClass_t &second)
	Equal operator.
bool	operator!= (const JClass_t &first, const JClass_t &second)
	Not equal operator.

Detailed Description

template<class JClass_t, class JTypelist_t>
struct JLANG::JMultiComparable< JClass_t, JTypelist_t >

Template definition of auxiliary base class for composite data structures composed of base classes with comparisons capabilities.

Each data type T in the type list should have the corresponding operator:

      bool operator<(const T&, const T& second);

This class uses in-class friend operators (see Barton-Nackman trick).

This class implements the operators < > <= >= == != .

Definition at line 32 of file JMultiComparable.hh.

Member Function Documentation

lt() [1/2]

template<class JClass_t , class JTypelist_t >

template<class JHead_t , class JTail_t >

static bool JLANG::JMultiComparable< JClass_t, JTypelist_t >::lt ( const JClass_t & first, const JClass_t & second, const JType< JTypeList< JHead_t, JTail_t > > & type )

inlinestaticprotected

Less than method for composite data types.

Parameters

first	first object
second	second object
type	type

Returns

true if first object is less than second object; else false

Definition at line 43 of file JMultiComparable.hh.

    {
      if      (static_cast<const JHead_t&>(first)  <
               static_cast<const JHead_t&>(second))
        return true;
      else if (static_cast<const JHead_t&>(second)  <
               static_cast<const JHead_t&>(first))
        return false;
      else
        return lt(first, second, JType<JTail_t>());
    }

lt() [2/2]

template<class JClass_t , class JTypelist_t >

template<class JHead_t >

static bool JLANG::JMultiComparable< JClass_t, JTypelist_t >::lt ( const JClass_t & first, const JClass_t & second, const JType< JTypeList< JHead_t, JNullType > > & type )

inlinestaticprotected

Less than method for composite data types.

Parameters

first	first object
second	second object
type	type

Returns

true if first object is less than second object; else false

Definition at line 67 of file JMultiComparable.hh.

    {
      return (static_cast<const JHead_t&>(first) <
              static_cast<const JHead_t&>(second));
    }

Friends And Related Symbol Documentation

operator<

template<class JClass_t , class JTypelist_t >

bool operator< ( const JClass_t & first, const JClass_t & second )

friend

Less than operator.

Parameters

first	first object
second	second object

Returns

true if first object is less than second object; else false

Definition at line 83 of file JMultiComparable.hh.

    { 
      return lt(first, second, JType<JTypelist_t>());
    }

operator>

template<class JClass_t , class JTypelist_t >

bool operator> ( const JClass_t & first, const JClass_t & second )

friend

Greater than operator.

Parameters

first	first object
second	second object

Returns

true if first object is greater than second object; else false

Definition at line 97 of file JMultiComparable.hh.

    { 
      return lt(second, first, JType<JTypelist_t>());
    }

operator<=

template<class JClass_t , class JTypelist_t >

bool operator<= ( const JClass_t & first, const JClass_t & second )

friend

Less than or equal operator.

Parameters

first	first object
second	second object

Returns

true if first object is less than or equal to second object; else false

Definition at line 111 of file JMultiComparable.hh.

    { 
      return !lt(second, first, JType<JTypelist_t>());
    }

operator>=

template<class JClass_t , class JTypelist_t >

bool operator>= ( const JClass_t & first, const JClass_t & second )

friend

Greater than or equal operator.

Parameters

first	first object
second	second object

Returns

true if first object is greater than or equal to second object; else false

Definition at line 125 of file JMultiComparable.hh.

    { 
      return !lt(first, second, JType<JTypelist_t>());
    }

operator==

template<class JClass_t , class JTypelist_t >

bool operator== ( const JClass_t & first, const JClass_t & second )

friend

Equal operator.

Parameters

first	first object
second	second object

Returns

true if two objects are equal; else false

Definition at line 139 of file JMultiComparable.hh.

    { 
      return (!lt(first, second, JType<JTypelist_t>()) &&
              !lt(second, first, JType<JTypelist_t>()));
    }

operator!=

template<class JClass_t , class JTypelist_t >

bool operator!= ( const JClass_t & first, const JClass_t & second )

friend

Not equal operator.

Parameters

first	first object
second	second object

Returns

true if two objects are not equal; else false

Definition at line 154 of file JMultiComparable.hh.

    {
      return (lt(first, second, JType<JTypelist_t>()) ||
              lt(second, first, JType<JTypelist_t>()));
    }

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

• JMultiComparable.hh