pni::core::value Class Reference

type erasure for POD data

#include <value.hpp>

Public Member Functions
	value ()
	default constructor
template<typename T , typename = typename enable_primitive<T>::type>
	value (T v)
	template constructor from value More...
	value (const value &o)
	copy constructor
	value (value &&o)
	move constructor
template<typename VT >
value &	operator= (const VT &v)
	copy assignment from value More...
value &	operator= (const value &o)
	copy assignment
value &	operator= (value &&o)
	move assignment operator
value &	operator= (const value_ref &v)
	copy construction from a value reference
template<typename T >
T	as () const
	get the stored value More...
type_id_t	type_id () const
	get type id More...

Private Types
typedef std::unique_ptr < value_holder_interface >	pointer_type
	internal pointer type
template<typename T >
using	enable_primitive = std::enable_if< is_primitive_type< T >::value >

Private Member Functions
template<typename T , typename S >
T	_get () const
	return value More...
template<typename S , typename T >
void	_set (const T &v) const
	set value More...

Private Attributes
pointer_type	_ptr
	pointer holding the value stored

Constructor & Destructor Documentation

template<typename T , typename = typename enable_primitive<T>::type>

pni::core::value::value ( T  v )

inlineexplicit

This constructor accepts all primitive types from libpnicore.

Template Parameters

T	primitive type

Parameters

v	value to store in the type erasure

Member Function Documentation

template<typename T , typename S >

T pni::core::value::_get ( ) const

inlineprivate

Return the value of the variable the reference refers to. T denotes the data type requested by the user. S denotes the type of the variable the reference points to.

Exceptions

type_error	if the conversion is not possible
range_error	if the value

Template Parameters

T	target type
S	source type

Returns

value as T

template<typename S , typename T >

void pni::core::value::_set ( const T &  v ) const

inlineprivate

Sets the value of the variable the reference points to.

Exceptions

type_error	if the conversion is not possible
range_error	if the passed value does not fit in the target type

Template Parameters

S	type of the variable
T	type of the value the user passed

Parameters

v	value to set

template<typename T >

T pni::core::value::as

(

)

const

Return the stored value as type T. If the value instance has not been initialized before an exception is thrown. In addition, if the data type passed as a template parameter does not fit the type used to store the data an exception will be thrown.

Exceptions

memory_not_allocate_error	if value is uninitialized
type_error	if T does not match the original data type
range_error	if the value stored does not fit into the requested type.

Returns

value of type T

template<typename VT >

value & pni::core::value::operator=

(

const VT &

v

)

Parameters

v	reference to the new value

Returns

instance of value

type_id_t pni::core::value::type_id

(

)

const

Returns the ID of the stored data type.

Exceptions

memory_not_allocated_error

if value is not initialized

Returns

type ID.

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

• value.hpp