dds::core::Value< D > Class Template Reference

This class is the base for various value-type dds objects. More...

#include "Value.hpp"

Inherited by dds::core::EntityQos, dds::core::InstanceHandle, dds::core::optional< T >, dds::core::policy::Deadline, dds::core::policy::DestinationOrder, dds::core::policy::Durability, dds::core::policy::DurabilityService, dds::core::policy::EntityFactory, dds::core::policy::GroupData, dds::core::policy::History, dds::core::policy::LatencyBudget, dds::core::policy::Lifespan, dds::core::policy::Liveliness, dds::core::policy::Ownership, dds::core::policy::OwnershipStrength, dds::core::policy::Partition, dds::core::policy::Presentation, dds::core::policy::QosPolicyCount, dds::core::policy::ReaderDataLifecycle, dds::core::policy::Reliability, dds::core::policy::ResourceLimits, dds::core::policy::TimeBasedFilter, dds::core::policy::TopicData, dds::core::policy::TransportPriority, dds::core::policy::UserData, dds::core::policy::WriterDataLifecycle, dds::core::status::InconsistentTopicStatus, dds::core::status::LivelinessChangedStatus, dds::core::status::LivelinessLostStatus, dds::core::status::OfferedDeadlineMissedStatus, dds::core::status::OfferedIncompatibleQosStatus, dds::core::status::PublicationMatchedStatus, dds::core::status::RequestedDeadlineMissedStatus, dds::core::status::RequestedIncompatibleQosStatus, dds::core::status::SampleLostStatus, dds::core::status::SampleRejectedStatus, dds::core::status::SubscriptionMatchedStatus, dds::pub::CoherentSet, dds::pub::SuspendedPublication, dds::sub::CoherentAccess, dds::sub::GenerationCount, dds::sub::Rank, dds::sub::Sample< T >, dds::sub::SampleInfo, dds::topic::BuiltinTopicKey, dds::topic::Filter, dds::topic::ParticipantBuiltinTopicData, dds::topic::PublicationBuiltinTopicData, dds::topic::SubscriptionBuiltinTopicData, and dds::topic::TopicBuiltinTopicData.

Public Member Functions
bool	operator!= (const Value &other) const
D *	operator-> ()
const D *	operator-> () const
Value &	operator= (const Value &other)
bool	operator== (const Value &other) const

Detailed Description

template<typename D>
class dds::core::Value< D >

This class is the base for various value-type dds objects.

QoS, Policy, Statuses, and Topic samples are all modeled as value-types.

All objects that have a value-type have a deep-copy assignment and copy construction semantics. It should also be pointed out that value-types are not 'pure-value-types' in the sense that they are immutable (as in functional programming languages).

The DDS-PSM-Cxx makes value-types mutable to limit the number of copies as well as to limit the time-overhead necessary to change a value-type (note that for immutable value-types the only form of change is to create a new value-type).

Definition at line 28 of file Value.hpp.

Member Function Documentation

operator!=()

template<typename D >

bool dds::core::Value< D >::operator!=

(

const Value< D > &

other

)

const

Compare this Value with another Value

Parameters

other

Value

Returns

true if not equal

operator->() [1/2]

template<typename D >

D* dds::core::Value< D >::operator->

(

)

The operator->() is provided to be able to directly invoke functions on the delegate.

The decision to provide direct access to the delegate was motivated by the need for providing a way that was not invasive with respect to the CXXDDS API and yet would allow for vendor-specific extension. Thus vendor-specific extensions can be invoked on the Value and on all its subclasses as follows:

my_dds_value.standard_function();
my_dds_value->vendor_specific_extension();

Returns

a reference to delegate.

operator->() [2/2]

template<typename D >

const D* dds::core::Value< D >::operator->

(

)

const

The operator->() is provided to be able to directly invoke functions on the delegate.

The decision to provide direct access to the delegate was motivated by the need for providing a way that was not invasive with respect to the CXXDDS API and yet would allow for vendor-specific extension. Thus vendor-specific extensions can be invoked on the Value and on all its subclasses as follows:

my_dds_value.standard_function();
my_dds_value->vendor_specific_extension();

Returns

a reference to delegate.

operator=()

template<typename D >

Value& dds::core::Value< D >::operator=

(

const Value< D > &

other

)

Assigns new delegate to this Value

Parameters

other

Value

operator==()

template<typename D >

bool dds::core::Value< D >::operator==

(

const Value< D > &

other

)

const

Compare this Value with another Value

Parameters

other

Value

Returns

true if equal

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

• dds/core/Value.hpp