Optional< T > Class Template Reference

An implementation of optional for C++11, which aims to be compatible with a subset of std::optional features. More...

#include <Optional.h>

Collaboration diagram for Optional< T >:

Public Member Functions
	Optional () noexcept
	Optional (nullopt_t) noexcept
	Optional (const T &value) noexcept
	Optional (const Optional< T > &other) noexcept
void	operator= (nullopt_t) noexcept
void	operator= (const Optional< T > &other) noexcept
T &	value ()
const T &	value () const
const T &	value_or (const T &def) const
bool	has_value () const noexcept
	operator bool () const

Private Attributes
bool	m_has_value = false
T	m_value

Detailed Description

template<typename T>
class Optional< T >

An implementation of optional for C++11, which aims to be compatible with a subset of std::optional features.

Unfortunately, Minetest doesn't use C++17 yet.

Template Parameters

T	The type to be stored

Constructor & Destructor Documentation

Optional() [1/4]

template<typename T >

Optional< T >::Optional ( )

inlinenoexcept

Optional() [2/4]

template<typename T >

Optional< T >::Optional ( nullopt_t  )

inlinenoexcept

Optional() [3/4]

template<typename T >

Optional< T >::Optional ( const T &  value )

inlinenoexcept

Optional() [4/4]

template<typename T >

Optional< T >::Optional ( const Optional< T > &  other )

inlinenoexcept

Member Function Documentation

has_value()

template<typename T >

bool Optional< T >::has_value ( ) const

inlinenoexcept

References Optional< T >::m_has_value.

operator bool()

template<typename T >

Optional< T >::operator bool ( ) const

inlineexplicit

References Optional< T >::m_has_value.

operator=() [1/2]

template<typename T >

void Optional< T >::operator= ( const Optional< T > &  other )

inlinenoexcept

References Optional< T >::m_has_value, and Optional< T >::m_value.

operator=() [2/2]

template<typename T >

void Optional< T >::operator= ( nullopt_t  )

inlinenoexcept

References Optional< T >::m_has_value.

value() [1/2]

template<typename T >

T& Optional< T >::value ( )

inline

References FATAL_ERROR_IF, Optional< T >::m_has_value, and Optional< T >::m_value.

Referenced by Nametag::getBgColor(), ObjectRef::l_get_nametag_attributes(), push_object_properties(), and ObjectProperties::serialize().

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value() [2/2]

template<typename T >

const T& Optional< T >::value ( ) const

inline

References FATAL_ERROR_IF, Optional< T >::m_has_value, and Optional< T >::m_value.

value_or()

template<typename T >

const T& Optional< T >::value_or ( const T &  def ) const

inline

References Optional< T >::m_has_value, and Optional< T >::m_value.

Member Data Documentation

m_has_value

template<typename T >

bool Optional< T >::m_has_value = false

private

Referenced by Optional< T >::has_value(), Optional< T >::operator bool(), Optional< T >::operator=(), Optional< T >::value(), and Optional< T >::value_or().

m_value

template<typename T >

T Optional< T >::m_value

private

Referenced by Optional< T >::operator=(), Optional< T >::value(), and Optional< T >::value_or().

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

• util/Optional.h