SBCClassConstructor Class Reference

This class describes a class constructor in a class proxy. More...

Constructors and destructors
	SBCClassConstructor ()
	Constructs a class constructor.
virtual	~SBCClassConstructor ()
	Destructs the constructor.

Creation functions
virtual bool	canCreateInstance (const SBValue &t0=SBValue(), const SBValue &t1=SBValue(), const SBValue &t2=SBValue(), const SBValue &t3=SBValue(), const SBValue &t4=SBValue(), const SBValue &t5=SBValue(), const SBValue &t6=SBValue(), const SBValue &t7=SBValue(), const SBValue &t8=SBValue(), const SBValue &t9=SBValue(), const SBValue &t10=SBValue(), const SBValue &t11=SBValue(), const SBValue &t12=SBValue(), const SBValue &t13=SBValue(), const SBValue &t14=SBValue(), const SBValue &t15=SBValue()) const
	Returns true if and only if the constructor can create an instance with arguments t0, t1, ..., t15.
virtual SBValue	createInstance (const SBValue &t0=SBValue(), const SBValue &t1=SBValue(), const SBValue &t2=SBValue(), const SBValue &t3=SBValue(), const SBValue &t4=SBValue(), const SBValue &t5=SBValue(), const SBValue &t6=SBValue(), const SBValue &t7=SBValue(), const SBValue &t8=SBValue(), const SBValue &t9=SBValue(), const SBValue &t10=SBValue(), const SBValue &t11=SBValue(), const SBValue &t12=SBValue(), const SBValue &t13=SBValue(), const SBValue &t14=SBValue(), const SBValue &t15=SBValue()) const
	Creates an instance of the class with arguments t0, t1, ..., t15.

Identity
virtual std::string	getClassName () const =0
	Returns the class name.
virtual std::string	getParameterTypeName (int i) const =0
	Returns the parameter type name of the constructor parameter i.
virtual SBValue	getParameterType (int i) const =0
	Returns the parameter type of the constructor parameter i.
virtual unsigned int	getNumberOfParameters () const =0
	Returns the number of parameters of the function.
virtual std::string	signature () const =0
	Returns the signature of the function.

Detailed Description

This class describes a class constructor in a class proxy. A class constructor object is a functor that provides access to a SAMSON Extension constructor that has been exposed through a class descriptor.

Assume for example a SAMSON Extension contains the following class:

class A {
 
SB_CLASS
 
public:
    
    A() {}
    virtual ~A() {}
    
};
 
SB_REGISTER_TYPE(A, "A", "BF99103E-06FE-C4C1-D929-4C6E833B101C");

as well as the following class descriptor:

SB_CLASS_BEGIN(A);
   
    SB_CLASS_TYPE(SBCClass::App);
    SB_CLASS_DESCRIPTION("Empty class");
   
    SB_FACTORY_BEGIN;
   
        SB_CONSTRUCTOR_0(A);
   
    SB_FACTORY_END;
   
    SB_INTERFACE_BEGIN;
    SB_INTERFACE_END;
   
SB_CLASS_END(A);

In this example, the constructor A() is accessible to other SAMSON Extensions through the SAMSON introspection mechanism, even when the definition of class A is not available. Precisely, even though other developers might not have access to the definition of class A (i.e. they do not have the appropriate header file), they may still retrieve constructors through the class proxy:

SBProxy* classProxy = SAMSON::getProxy("A");
SBFactory* classFactory = classProxy->getFactory();
SBConstructor* classConstructor = classFactory->getConstructor();

which they may then use to construct an instance of class A:

SBValue* objectHolder = classConstructor->createInstance();

Note that the class proxy also makes it possible to directly create an instance of an exposed class without having first to obtain the SBCClassConstructor object:

SBValue* objectHolder = classProxy->createInstance();

However, when multiple calls to the constructor are performed, it is more efficient to store a pointer to a SBCClassConstructor object and reuse it.

Note that a class constructor object should never be deleted.

Please refer to the chapter about introspection for more information.

Short name: SBConstructor

See also

Introspection

SBCClassFactory

SBCClassProxy