epics::pvData::AnyScalar Class Reference

#include <misc/pv/anyscalar.h>

Classes
struct	bad_cast

Public Member Functions
	AnyScalar ()
template<typename T >
	AnyScalar (T v)
	Construct from provided value.
	AnyScalar (ScalarType type, const void *buf)
	AnyScalar (const AnyScalar &o)
AnyScalar &	operator= (const AnyScalar &o)
template<typename T >
AnyScalar &	operator= (T v)
void	clear ()
void	swap (AnyScalar &o)
ScalarType	type () const
	Type code of contained value. Or (ScalarType)-1 is empty.
void *	unsafe ()
const void *	unsafe () const
bool	empty () const
	operator bool_type () const
const void *	bufferUnsafe () const
template<typename T >
detail::any_storage_type < typename meta::strip_const < T >::type >::type &	ref ()
template<typename T >
meta::decorate_const< typename detail::any_storage_type < typename meta::strip_const < T >::type >::type >::type &	ref () const
template<typename T >
T	as () const

Friends
std::ostream &	operator<< (std::ostream &strm, const AnyScalar &v)

Detailed Description

A type-safe variant union capable of holding any of the PVD scalar types (POD or string)

AnyScalar A(5);
assert(A.type()==pvInt);
assert(A.ref<int32>()==5);
assert(A.as<int32>()==5);
assert(A.as<double>()==5.0);
assert(A.ref<double>()==5.0); // throws AnyScalar::bad_cast

Definition at line 51 of file anyscalar.h.

Constructor & Destructor Documentation

epics::pvData::AnyScalar::AnyScalar ( )

inline

Construct empty

Postcondition

empty()==true

Definition at line 100 of file anyscalar.h.

epics::pvData::AnyScalar::AnyScalar	(	ScalarType	type,
		const void *	buf
	)

Construct from un-typed pointer. Caller is responsible to ensure that buf actually points to the provided type

Version

Added after 7.0.0

Member Function Documentation

template<typename T >

T epics::pvData::AnyScalar::as ( ) const

inline

copy out wrapped value, with a value conversion.

Exceptions

bad_cast

when empty()==true

Definition at line 230 of file anyscalar.h.

const void* epics::pvData::AnyScalar::bufferUnsafe

(

)

const

Provide read-only access to underlying buffer. For a string this is std::string::c_str().

Version

Added after 7.0.0

void epics::pvData::AnyScalar::clear

(

)

Reset internal state.

Version

Added after 7.0.0

Postcondition

empty()==true

template<typename T >

detail::any_storage_type<typename meta::strip_const<T>::type>::type& epics::pvData::AnyScalar::ref ( )

inline

Return typed reference to wrapped value. Non-const reference allows value modification

Exceptions

bad_cast

when the requested type does not match the stored type AnyScalar v(42); v.ref<uint32>() = 43; assert(v.ref<uint32>() == 43);

Definition at line 194 of file anyscalar.h.

template<typename T >

meta::decorate_const<typename detail::any_storage_type<typename meta::strip_const<T>::type>::type>::type& epics::pvData::AnyScalar::ref ( ) const

inline

Return typed reference to wrapped value. Const reference does not allow modification.

Exceptions

bad_cast

when the requested type does not match the stored type const AnyScalar v(42); assert(v.ref<uint32>() == 42);

Definition at line 215 of file anyscalar.h.

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

• misc/pv/anyscalar.h