sensesp::Nullable< bool > Class Reference

Validity-flag specialization of Nullable for bool. More...

#include <sensesp/types/nullable.h>

Public Member Functions
	Nullable ()
	Nullable (bool value)
	Nullable (const Nullable< bool > &other)=default
Nullable< bool > &	operator= (bool value)
Nullable< bool > &	operator= (const Nullable< bool > &other)=default
	operator bool () const
bool	is_valid () const
bool *	ptr ()
bool	value () const

Static Public Member Functions
static Nullable< bool >	invalid ()

Detailed Description

Validity-flag specialization of Nullable for bool.

bool has no spare value to reserve as an invalid sentinel, so unlike the primary template this specialization tracks validity with an explicit flag: true, false, and invalid are all distinct. A default-constructed Nullable<bool> is invalid (no value yet); construct from a bool for a valid value, or use invalid() for the missing state.

This mirrors the primary template's public interface by hand – keep the two in sync when that interface changes.

Two intentional asymmetries with the primary template:

• invalid() returns a Nullable<bool> instance, not a bare bool: there is no sentinel bool value to hand back. The only generic caller, RepeatExpiring::repeat_function(), accepts it directly; generic code must not assume invalid() yields a bare T.
• operator bool() and value() return the stored value regardless of validity (an invalid Nullable<bool> reads as false), matching the primary's implicit conversion. Check is_valid() before relying on the value.

Definition at line 80 of file nullable.h.

Constructor & Destructor Documentation

Nullable() [1/3]

sensesp::Nullable< bool >::Nullable ( )

inline

Definition at line 82 of file nullable.h.

Nullable() [2/3]

sensesp::Nullable< bool >::Nullable ( bool  value )

inline

Definition at line 83 of file nullable.h.

Nullable() [3/3]

sensesp::Nullable< bool >::Nullable ( const Nullable< bool > &  other )

default

Member Function Documentation

invalid()

static Nullable< bool > sensesp::Nullable< bool >::invalid ( )

inlinestatic

Definition at line 106 of file nullable.h.

is_valid()

bool sensesp::Nullable< bool >::is_valid ( ) const

inline

Definition at line 95 of file nullable.h.

operator bool()

sensesp::Nullable< bool >::operator bool ( ) const

inline

Definition at line 91 of file nullable.h.

operator=() [1/2]

Nullable< bool > & sensesp::Nullable< bool >::operator= ( bool  value )

inline

Definition at line 85 of file nullable.h.

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operator=() [2/2]

Nullable< bool > & sensesp::Nullable< bool >::operator= ( const Nullable< bool > &  other )

default

ptr()

bool * sensesp::Nullable< bool >::ptr ( )

inline

Definition at line 101 of file nullable.h.

value()

bool sensesp::Nullable< bool >::value ( ) const

inline

Definition at line 110 of file nullable.h.

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

• src/sensesp/types/nullable.h