Re: [boost] Re: Any interest in a generic pluggable factory class?

From: Rob & Lori (Rob.Lori_at_[hidden])
Date: 2003-08-30 12:58:21

Bohdan wrote:

>If your solution is generic i'm interested.
>Is it possible to look at code ?
>BTW, Your library may correlate with expected serialization library.
>
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>
Thanks for your interest!  Yep, it's a truely generic implementation. I 
just added the files to the boost files section.  It contains the 
PluggableFactory class itself as well as 3 example files of how to use 
the class.  You can download the zip here: 
http://groups.yahoo.com/group/boost/files/Generic%20Pluggable%20Factory/

Rob Geiman

>regards,
>bohdan
>
>"Rob & Lori" <Rob.Lori_at_[hidden]> wrote in message
>news:3F4E81BA.1040902_at_buckeye-express.com...
>  
>
>>For those of you who are unfamiliar with pluggable factories, I suggest
>>reading the following C++ Report article:
>>http://www.adtmag.com/joop/crarticle.asp?ID=1520
>>
>>To give a brief description, pluggable factories allow programmers to
>>create instances of a class by just referencing a class identifier.
>>Pluggable factories are extremely helpful anytime you wish to construct
>>a class based on outside input such as reconstructing classes sent over
>>a TCP/IP stream, constructing classes read from a file, constructing
>>classes to execute commands read in from a scripting/macro language, etc.
>>
>>The pluggable factory has these features:
>>1. Classes can be registered and unregistered dynamically
>>2. Any data type that implements the assignment and comparison operators
>>can be used as a class identifier type
>>3. Classes can be registered with multiple class identifier's, even if
>>they are of different data types
>>3. Instances of new classes can be created simply by passing the correct
>>class identifier
>>4. The class identifier value can be retrieved for any given registered
>>class
>>
>>Let me know what you guys think.
>>
>>Rob Geiman
>>
>>
>>Example usage:
>>
>>typedef ObjectFactory<Command> CommandFactory;
>>
>>static std::string open_file_command = "open_file";
>>static std::string close_file_command = "close_file";
>>static std::string find_text_command = "find_text";
>>
>>...
>>
>>CommandFactory::Register<OpenFileCommand>(open_file_command);
>>CommandFactory::Register<CloseFileCommand>(close_file_command);
>>CommandFactory::Register<FindTextCommand>(find_text_command);
>>
>>...
>>
>>// Loop through macro stream, reading in and executing all commands
>>std::string cmd_text;
>>
>>while (macro_stream.good() && !macro_stream.eof())
>>{
>>    macro_stream >> cmd_text;
>>
>>    Command *cmd = CommandFactory::Create(cmd_text);
>>
>>    if (cmd)
>>    {
>>        cmd->ExtractParams(macro_stream);
>>        cmd->Execute();
>>    }
>>    else
>>    {
>>        std::cout << "Unknown command: " << cmd_text << std::endl;
>>    }
>>}
>>
>>...
>>
>>std::cout << "Class OpenFileCommand registered with id " <<
>>CommandFactory::GetClassId<OpenFileCommand, string>() << std::endl;
>>std::cout << "Class CloseFileCommand registered with id " <<
>>CommandFactory::GetClassId<OpenFileCommand, string>() << std::endl;
>>std::cout << "Class FindTextCommand registered with id " <<
>>CommandFactory::GetClassId<OpenFileCommand, string>() << std::endl;
>>
>>...
>>
>>CommandFactory::Unregister(open_file_command);
>>CommandFactory::Unregister(close_file_command);
>>CommandFactory::Unregister(find_text_command);
>>
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>>
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