pmem::kv::result< T > Class Template Reference

Stores result of an operation. It always contains status and optionally can contain value. More...

#include <libpmemkv.hpp>

Public Member Functions
	result (const T &val) noexcept(noexcept(T(std::declval< T >())))
	Creates result with value (status is automatically initialized to status::OK). More...
	result (const status &err) noexcept
	Creates result which contains only status. More...
	result (const result &other) noexcept(noexcept(T(std::declval< T >())))
	Default copy constructor. More...
	result (result &&other) noexcept(noexcept(T(std::declval< T >())))
	Default move constructor. More...
	result (T &&val) noexcept(noexcept(T(std::declval< T >())))
	Constructor with rvalue reference to T. More...
	~result ()
	Explicit destructor. More...
result &	operator= (const result &other) noexcept(noexcept(std::declval< T >().~T()) &&noexcept(T(std::declval< T >())))
	Default copy assignment operator. More...
result &	operator= (result &&other) noexcept(noexcept(std::declval< T >().~T()) &&noexcept(T(std::declval< T >())))
	Default move assignment operator. More...
bool	is_ok () const noexcept
	Checks if the result contains value (status == status::OK). More...
const T &	get_value () const &
	Returns const reference to value from the result. More...
T &	get_value () &
	Returns reference to value from the result. More...
T &&	get_value () &&
	Returns rvalue reference to value from the result. More...
status	get_status () const noexcept
	Returns status from the result. More...

Private Attributes
union {
T   value
};
status	s

Detailed Description

template<typename T>
class pmem::kv::result< T >

Stores result of an operation. It always contains status and optionally can contain value.

If result contains value: is_ok() returns true, get_value() returns value, get_status() returns status::OK.

If result contains error: is_ok() returns false, get_value() throws bad_result_access, get_status() returns status other than status::OK.

Constructor & Destructor Documentation

result() [1/5]

template<typename T >

pmem::kv::result< T >::result ( const T &  val )

noexcept

Creates result with value (status is automatically initialized to status::OK).

Parameters

[in]

val

value.

result() [2/5]

template<typename T >

pmem::kv::result< T >::result ( const status &  status )

noexcept

Creates result which contains only status.

Parameters

[in]

status

status other than status::OK.

result() [3/5]

template<typename T >

pmem::kv::result< T >::result ( const result< T > &  other )

noexcept

Default copy constructor.

Parameters

[in]

other

result to copy.

result() [4/5]

template<typename T >

pmem::kv::result< T >::result ( result< T > &&  other )

noexcept

Default move constructor.

Parameters

[in]

other

result to move.

result() [5/5]

template<typename T >

pmem::kv::result< T >::result ( T &&  val )

noexcept

Constructor with rvalue reference to T.

Parameters

[in]

val

rvalue reference to T

~result()

template<typename T >

pmem::kv::result< T >::~result

Explicit destructor.

Member Function Documentation

get_status()

template<typename T >

status pmem::kv::result< T >::get_status

noexcept

Returns status from the result.

It returns status::OK if there is a value, and other status (with the appropriate 'error') if there isn't any value.

Returns

status

get_value() [1/3]

template<typename T >

T & pmem::kv::result< T >::get_value

(

)

&

Returns reference to value from the result.

If result doesn't contain value, throws bad_result_access.

Exceptions

bad_result_access

Returns

reference to value from the result

get_value() [2/3]

template<typename T >

T && pmem::kv::result< T >::get_value

(

)

&&

Returns rvalue reference to value from the result.

If result doesn't contain value, throws bad_result_access.

Exceptions

bad_result_access

Returns

rvalue reference to value from the result

get_value() [3/3]

template<typename T >

const T & pmem::kv::result< T >::get_value

(

)

const &

Returns const reference to value from the result.

If result doesn't contain value, throws bad_result_access.

Exceptions

bad_result_access

Returns

const reference to value from the result.

is_ok()

template<typename T >

bool pmem::kv::result< T >::is_ok

noexcept

Checks if the result contains value (status == status::OK).

Returns

bool

operator=() [1/2]

template<typename T >

result< T > & pmem::kv::result< T >::operator= ( const result< T > &  other )

noexcept

Default copy assignment operator.

Parameters

[in]

other

result to copy.

operator=() [2/2]

template<typename T >

result< T > & pmem::kv::result< T >::operator= ( result< T > &&  other )

noexcept

Default move assignment operator.

Parameters

[in]

other

result to move.

Member Data Documentation

union { ... }

s

template<typename T >

status pmem::kv::result< T >::s

private

value

template<typename T >

T pmem::kv::result< T >::value

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

• /pmemkv/src/libpmemkv.hpp