mxvk::Wrapper< T > Class Template Reference

A nullable smart wrapper around a raw pointer. More...

#include <mxvk/include/mxvk/mxvk_wrapper.hpp>

Public Member Functions
T	expect (const std::string &msg) const
	Unwrap with a custom panic message on null.
bool	has_value () const noexcept
	Check whether a non-null value is held.
	operator bool () const noexcept
	Check if a value is present and non-null.
Wrapper< T > &	operator= (const Wrapper< T > &)=default
	Copy-assign from another Wrapper.
Wrapper< T > &	operator= (std::nullopt_t nullopt)
	Reset to the empty (nullopt) state.
Wrapper< T > &	operator= (T t)
	Assign from a raw pointer.
Wrapper< T > &	operator= (Wrapper< T > &&) noexcept=default
	Move-assign from another Wrapper.
T	unwrap () const
	Unwrap the stored pointer, panicking on null.
T	unwrap_or (T fallback) const noexcept
	Return the stored pointer or a fallback if null.
T	value () const
	Access the stored pointer without null checking.
	Wrapper ()=default
	Default constructor — initialises to nullopt (no value).
	Wrapper (const Wrapper< T > &)=default
	Copy constructor.
	Wrapper (std::nullopt_t nullopt)
	Construct in the empty (nullopt) state.
	Wrapper (T t)
	Construct from a raw pointer.
	Wrapper (Wrapper< T > &&) noexcept=default
	Move constructor.
	~Wrapper ()=default

Detailed Description

template<WrapType T>
class mxvk::Wrapper< T >

A nullable smart wrapper around a raw pointer.

Stores an optional pointer. Accessors throw mx::Exception if the pointer is null (unwrap, expect) or return a fallback (unwrap_or).

Template Parameters

T	A raw pointer type (must satisfy WrapType concept).

Definition at line 36 of file mxvk_wrapper.hpp.

Constructor & Destructor Documentation

Wrapper() [1/5]

template<WrapType T>

mxvk::Wrapper< T >::Wrapper ( )

default

Default constructor — initialises to nullopt (no value).

Wrapper() [2/5]

template<WrapType T>

mxvk::Wrapper< T >::Wrapper ( T t )

inline

Construct from a raw pointer.

Parameters

t	Pointer to wrap.

Definition at line 45 of file mxvk_wrapper.hpp.

: type{t} {}

Wrapper() [3/5]

template<WrapType T>

mxvk::Wrapper< T >::Wrapper ( std::nullopt_t nullopt )

inline

Construct in the empty (nullopt) state.

Parameters

nullopt

std::nullopt.

Definition at line 51 of file mxvk_wrapper.hpp.

: type{nullopt} {}

Wrapper() [4/5]

template<WrapType T>

mxvk::Wrapper< T >::Wrapper ( const Wrapper< T > & )

default

Copy constructor.

Wrapper() [5/5]

template<WrapType T>

mxvk::Wrapper< T >::Wrapper ( Wrapper< T > && )

defaultnoexcept

Move constructor.

~Wrapper()

template<WrapType T>

mxvk::Wrapper< T >::~Wrapper ( )

default

Member Function Documentation

expect()

template<WrapType T>

T mxvk::Wrapper< T >::expect ( const std::string & msg ) const

inlinenodiscard

Unwrap with a custom panic message on null.

Parameters

msg	Message to include in the thrown mx::Exception.

Returns

The stored pointer.

Exceptions

mx::Exception

if the value is null or absent.

Definition at line 108 of file mxvk_wrapper.hpp.

                                                           {
            if (has_value()) {
                return type.value();
            }
            throw mxvk::Exception(std::format("panic: {}", msg));
        }

has_value()

template<WrapType T>

bool mxvk::Wrapper< T >::has_value ( ) const

inlinenodiscardnoexcept

Check whether a non-null value is held.

Returns

true if a non-null pointer is stored.

Definition at line 91 of file mxvk_wrapper.hpp.

{ return type.has_value() && type.value() != nullptr; }

operator bool()

template<WrapType T>

mxvk::Wrapper< T >::operator bool ( ) const

inlineexplicitnodiscardnoexcept

Check if a value is present and non-null.

Definition at line 94 of file mxvk_wrapper.hpp.

{ return has_value(); }

operator=() [1/4]

template<WrapType T>

Wrapper< T > & mxvk::Wrapper< T >::operator= ( const Wrapper< T > & )

default

Copy-assign from another Wrapper.

operator=() [2/4]

template<WrapType T>

Wrapper< T > & mxvk::Wrapper< T >::operator= ( std::nullopt_t nullopt )

inline

Reset to the empty (nullopt) state.

Parameters

nullopt

std::nullopt.

Returns

Reference to this.

Definition at line 76 of file mxvk_wrapper.hpp.

                                                  {
            type = nullopt;
            return *this;
        }

operator=() [3/4]

template<WrapType T>

Wrapper< T > & mxvk::Wrapper< T >::operator= ( T t )

inline

Assign from a raw pointer.

Parameters

t	Pointer to store.

Returns

Reference to this.

Definition at line 66 of file mxvk_wrapper.hpp.

                                 {
            type = t;
            return *this;
        }

operator=() [4/4]

template<WrapType T>

Wrapper< T > & mxvk::Wrapper< T >::operator= ( Wrapper< T > && )

defaultnoexcept

Move-assign from another Wrapper.

unwrap()

template<WrapType T>

T mxvk::Wrapper< T >::unwrap ( ) const

inlinenodiscard

Unwrap the stored pointer, panicking on null.

Returns

The stored pointer.

Exceptions

mx::Exception

if the value is null or absent.

Definition at line 120 of file mxvk_wrapper.hpp.

                                       {
            if (has_value()) {
                return type.value();
            }
            throw mxvk::Exception("mxvk panic: Wrapper value is null");
        }

unwrap_or()

template<WrapType T>

T mxvk::Wrapper< T >::unwrap_or ( T fallback ) const

inlinenodiscardnoexcept

Return the stored pointer or a fallback if null.

Parameters

fallback

Pointer returned when no value is held.

Returns

The stored pointer, or fallback if null/absent.

Definition at line 132 of file mxvk_wrapper.hpp.

                                                             {
            if (has_value()) {
                return type.value();
            }
            return fallback;
        }

value()

template<WrapType T>

T mxvk::Wrapper< T >::value ( ) const

inlinenodiscard

Access the stored pointer without null checking.

Returns

The stored pointer (may be nullptr if constructed from nullopt).

Definition at line 100 of file mxvk_wrapper.hpp.

{ return type.value_or(nullptr); }

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

• mxvk/include/mxvk/mxvk_wrapper.hpp