sensesp::Nullable< T > Class Template Reference

Template class that supports a special invalid magic value for a type. More...

#include <sensesp/types/nullable.h>

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

Static Public Member Functions
static T	invalid ()

Detailed Description

template<typename T>
class sensesp::Nullable< T >

Template class that supports a special invalid magic value for a type.

Each specialization defines an invalid sentinel (see nullable.cpp; e.g. float -> -1e9, uint8_t -> 0xff), matching the NMEA 2000 "missing data" values. A value is invalid only when it equals that sentinel. A default-constructed Nullable holds T{} (0), so it is valid for types whose sentinel differs from 0; use Nullable<T>::invalid() to obtain the invalid value explicitly.

bool has no spare value to reserve as a sentinel, so Nullable<bool> is an explicit specialization (below) that tracks validity with a separate flag.

Definition at line 21 of file nullable.h.

Constructor & Destructor Documentation

Nullable() [1/2]

template<typename T >

sensesp::Nullable< T >::Nullable ( )

inline

Definition at line 23 of file nullable.h.

Nullable() [2/2]

template<typename T >

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

inline

Definition at line 24 of file nullable.h.

Member Function Documentation

invalid()

template<typename T >

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

inlinestatic

Definition at line 45 of file nullable.h.

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is_valid()

template<typename T >

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

inline

Definition at line 37 of file nullable.h.

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operator T()

template<typename T >

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

inline

Definition at line 33 of file nullable.h.

operator=() [1/2]

template<typename T >

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

inline

Definition at line 29 of file nullable.h.

operator=() [2/2]

template<typename T >

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

inline

Definition at line 25 of file nullable.h.

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ptr()

template<typename T >

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

inline

Definition at line 41 of file nullable.h.

value()

template<typename T >

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

inline

Definition at line 49 of file nullable.h.

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

• src/sensesp/types/nullable.h
• src/sensesp/types/nullable.cpp