CL_Library classes

["sylvain HELLEGOUARCH" <shellegouarch@programmationworld.com>]

Hi, 

Here is my CL_Library classes. The package offers three classes : 

- CL_LibraryLoader. This class is jys a wrapper to dlfcn under Linux and 
GetProcAddress family under Windows. This is the way one would load dynamic 
libraries with Clanlib. 

- CL_LibraryFactory does nothing. It's an abstract base class for every 
classes that would like to be managed by : 

- CL_LibraryManager. This class shouldn't be instancied (it would be 
pointless as it only defines static methods). 

Why did I provide the two latest classes ? 

Well loading C code and parsing it to find a symbol is something that dlfnc 
or GetProcAddress do well because C compilators doesn't decorate symbols 
with anything as within a C module you can't have two functions with the 
same name. But C++ allows overloading which mean symbols can't be unique 
anymore within a module so compilators have to add some garbage codes to the 
symbol to make it unique. Unfortunately, this a random process that can't be 
parsed by neither dlfnc nor GetProcAddress. Then the only method to 
dynamically load classes is to provide a C function within the module that 
will create an instance of the class. 

Therefore, CL_LibraryManager handles all this function within a map. Thus 
you would use it like thata : 

Create a base class that inherits CL_LibraryFactory
Create a class that inherits your base class and put somewhere within the 
module a function like : 

extern "C" MyBaseClass *MyClassMer() { return new MyClass; } 

Build your library or dll
Load it with CL_LibraryLoader
Get the name of the maker with resolve()
Add it to the CL_LibraryManager map with add()
Retreive it with get() 

I hope everything will be fine with the package. 

Bye
- Sylvain Hellegouarch

Attachment: CL_Library.zip
Description: Zip archive

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