Base class for all the callback classes.  
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#include <TelepathyQt/Callbacks>
Inherited by Tp::Callback1< DebugMessageList, DBusError * >, Tp::Callback1< Tp::ConnectionAliasFlags, DBusError * >, Tp::Callback1< void, DBusError * >, Tp::Callback1< void, QString >, Tp::Callback2< BaseChannelPtr, const QVariantMap &, DBusError * >, Tp::Callback2< BaseConnectionPtr, const QVariantMap &, DBusError * >, Tp::Callback2< bool, const QVariantMap &, DBusError * >, Tp::Callback2< QDBusObjectPath, const QVariantMap &, DBusError * >, Tp::Callback2< QString, const QString &, DBusError * >, Tp::Callback2< QString, const QVariantMap &, DBusError * >, Tp::Callback2< QStringList, const Tp::UIntList &, DBusError * >, Tp::Callback2< QStringList, uint, DBusError * >, Tp::Callback2< Tp::AliasMap, const Tp::UIntList &, DBusError * >, Tp::Callback2< Tp::AvatarTokenMap, const Tp::UIntList &, DBusError * >, Tp::Callback2< Tp::ContactCapabilitiesMap, const Tp::UIntList &, DBusError * >, Tp::Callback2< Tp::ContactClientTypes, const Tp::UIntList &, DBusError * >, Tp::Callback2< Tp::ContactInfoFieldList, uint, DBusError * >, Tp::Callback2< Tp::ContactInfoMap, const Tp::UIntList &, DBusError * >, Tp::Callback2< void, const QByteArray &, DBusError * >, Tp::Callback2< void, const QDBusObjectPath &, DBusError * >, Tp::Callback2< void, const QString &, DBusError * >, Tp::Callback2< void, const QVariantMap &, DBusError * >, Tp::Callback2< void, const Tp::AliasMap &, DBusError * >, Tp::Callback2< void, const Tp::CaptchaAnswers &, DBusError * >, Tp::Callback2< void, const Tp::ContactInfoFieldList &, DBusError * >, Tp::Callback2< void, const Tp::HandlerCapabilitiesList &, DBusError * >, Tp::Callback2< void, const Tp::LocalMuteState &, DBusError * >, Tp::Callback2< void, const Tp::MessagePartList &, DBusError * >, Tp::Callback2< void, const Tp::UIntList &, DBusError * >, Tp::Callback2< void, uchar, DBusError * >, Tp::Callback2< void, uint, DBusError * >, Tp::Callback3< QByteArray, uint, const QString &, DBusError * >, Tp::Callback3< QString, const QByteArray &, const QString &, DBusError * >, Tp::Callback3< QString, const QString &, const QString &, DBusError * >, Tp::Callback3< QString, const Tp::MessagePartList &, uint, DBusError * >, Tp::Callback3< QStringList, uint, const Tp::UIntList &, DBusError * >, Tp::Callback3< Tp::ContactAttributesMap, const QStringList &, bool, DBusError * >, Tp::Callback3< Tp::ContactAttributesMap, const Tp::UIntList &, const QStringList &, DBusError * >, Tp::Callback3< Tp::UIntList, uint, const QStringList &, DBusError * >, Tp::Callback3< uint, const QString &, const QString &, DBusError * >, Tp::Callback3< void, const QString &, const QByteArray &, DBusError * >, Tp::Callback3< void, const Tp::LocalHoldState &, const Tp::LocalHoldStateReason &, DBusError * >, Tp::Callback3< void, const Tp::UIntList &, const QString &, DBusError * >, Tp::Callback3< void, uint, const QString &, DBusError * >, Tp::Callback4< QDBusObjectPath, const QString &, const Tp::MediaStreamType &, const Tp::MediaStreamDirection &, DBusError * >, Tp::Callback4< void, const Tp::UIntList &, const QString &, uint, DBusError * >, Tp::Callback4< void, Tp::CaptchaInfoList &, uint &, QString &, DBusError * >, Tp::Callback4< void, uint, const QString &, const QString &, DBusError * >, Tp::Callback5< void, const QStringList &, const QStringList &, Tp::AddressingNormalizationMap &, Tp::ContactAttributesMap &, DBusError * >, Tp::Callback6< void, const QString &, const QStringList &, const QStringList &, Tp::AddressingNormalizationMap &, Tp::ContactAttributesMap &, DBusError * >, Tp::Callback0< R >, Tp::Callback1< R, Arg1 >, Tp::Callback2< R, Arg1, Arg2 >, Tp::Callback3< R, Arg1, Arg2, Arg3 >, Tp::Callback4< R, Arg1, Arg2, Arg3, Arg4 >, Tp::Callback5< R, Arg1, Arg2, Arg3, Arg4, Arg5 >, Tp::Callback6< R, Arg1, Arg2, Arg3, Arg4, Arg5, Arg6 >, and Tp::Callback7< R, Arg1, Arg2, Arg3, Arg4, Arg5, Arg6, Arg7 >.
Base class for all the callback classes. 
See Callbacks Usage 
  
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          | Tp::BaseCallback::BaseCallback | ( |  | ) |  |  | inline | 
 
 
  
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          | Tp::BaseCallback::BaseCallback | ( | const BaseCallback & | other | ) |  |  | inline | 
 
 
  
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          | virtual Tp::BaseCallback::~BaseCallback | ( |  | ) |  |  | inlinevirtual | 
 
 
  
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          | bool Tp::BaseCallback::isValid | ( |  | ) | const |  | inline | 
 
Return whether this callback object has a valid functor assigned to it or if it's a default-constructed dummy callback object.
- Returns
- falseif this is a default-constructed callback or- trueif this callback was constructed from a functor.