[pclasses-devel] factory mini-demo

[stephan b. <st...@s1...>]

Yo,

Consider the following 3 classes:

AType ==> extended by ==> BType ==> x by ==> CType

Here's the current P2 code to get at them via Factory:

First, register them:

	P::CL::registerBase<AType>( "AType" );
	P::CL::registerSubtype<AType,BType>( "BType" );
	P::CL::registerSubtype<AType,CType>( "CType" );

Here we use the default factories, but we can also swap those out with 
our own via at least 3 different techniques. In standard usage the 
default factories serve very well. There will also be a technique to 
allow DLLs to *register themselves* with their factory(ies), meaning P 
won't have to do any more symbol lookups in DLLs to load classes.

Part 2, load them:

#define LOAD(CN) a = P::CL::classload<AType>( CN ); \
	CERR << CN << " loaded? == " << a << "\n"; \
	if( a ) CERR << "classname="<<a->classname()<<"\n"; \
	delete( a ); a = 0;

	LOAD("AType");
	LOAD("BType");
	LOAD("CType");
	LOAD("NoType");

Output:
stephan@owl:~/cvs/pclasses2/test> ./FactoryTest
FactoryTest.cpp:59 : Factory tests...
FactoryTest.cpp:20 : AType()
FactoryTest.cpp:75 : AType loaded? == 0x804e3d0
FactoryTest.cpp:75 : classname=AType
FactoryTest.cpp:24 : ~AType()
FactoryTest.cpp:20 : AType()
FactoryTest.cpp:35 : BType()
FactoryTest.cpp:76 : BType loaded? == 0x804e3d0
FactoryTest.cpp:76 : classname=BType
FactoryTest.cpp:39 : ~BType()
FactoryTest.cpp:24 : ~AType()
FactoryTest.cpp:20 : AType()
FactoryTest.cpp:35 : BType()
FactoryTest.cpp:48 : CType()
FactoryTest.cpp:77 : CType loaded? == 0x804e3d0
FactoryTest.cpp:77 : classname=CType
FactoryTest.cpp:52 : ~CType()
FactoryTest.cpp:39 : ~BType()
FactoryTest.cpp:24 : ~AType()
FactoryTest.cpp:78 : NoType loaded? == 0



The reasons their addresses repeat is because we delete the object 
between each call - that is not a bug.


-- 
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