A three state "bool". Does not provide the operations of ternary logic and is intended for use mostly as a convenient, three-way input argument. Can not be used as a base class since it does not have a virtual destructor. More...

#include <tern.h>

Public Types
enum	state_type { TRUE, FALSE, NEITHER }
	The three possible values. More...

Public Member Functions
	tern ()
	Default constructor. More...

	tern (const tern &xother)
	Copy constructor. More...

	~tern ()
	/// Conversion from boolean. More...

tern &	operator= (const tern &xother)
	Assignment operator. More...

	operator bool () const
	/// Assignment operator More...

bool	is_true () const
	True if thi has value true. More...

bool	is_false () const
	True if this has value false. More...

bool	is_neither () const
	True if this is neither true nor false. More...

	tern (state_type xstate)
	Creates instance with state xstate. More...

Detailed Description

A three state "bool". Does not provide the operations of ternary logic and is intended for use mostly as a convenient, three-way input argument. Can not be used as a base class since it does not have a virtual destructor.

Definition at line 45 of file tern.h.

Member Enumeration Documentation

◆ state_type

enum sheaf::tern::state_type

The three possible values.

Definition at line 107 of file tern.h.

Constructor & Destructor Documentation

◆ tern() [1/3]

sheaf::tern::tern ( )

Default constructor.

Hack:: Something in the AIX xlC environment is defining TRUE and FALSE. Until we find a workaround, undefine them.

Definition at line 44 of file tern.cc.

Referenced by is_neither().

◆ tern() [2/3]

sheaf::tern::tern ( const tern & xother )

Copy constructor.

Definition at line 64 of file tern.cc.

References ~tern().

◆ ~tern()

sheaf::tern::~tern ( )

/// Conversion from boolean.

Destructor.

Definition at line 104 of file tern.cc.

References operator=().

Referenced by tern().

◆ tern() [3/3]

sheaf::tern::tern ( state_type xstate )

Creates instance with state xstate.

Definition at line 209 of file tern.cc.

Member Function Documentation

◆ is_false()

bool sheaf::tern::is_false ( ) const

True if this has value false.

Definition at line 194 of file tern.cc.

References is_neither().

Referenced by is_true().

◆ is_neither()

bool sheaf::tern::is_neither ( ) const

True if this is neither true nor false.

Definition at line 202 of file tern.cc.

References tern().

Referenced by is_false().

◆ is_true()

bool sheaf::tern::is_true ( ) const

True if thi has value true.

Definition at line 186 of file tern.cc.

References is_false().

Referenced by operator bool().

◆ operator bool()

sheaf::tern::operator bool ( ) const

/// Assignment operator

Conversion to bool.

Postcondition

result == is_true()

Definition at line 163 of file tern.cc.

References is_true().

◆ operator=()

sheaf::tern & sheaf::tern::operator= ( const tern & xother )

Assignment operator.

Definition at line 124 of file tern.cc.

Referenced by ~tern().

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

Public Types

Public Member Functions