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// Copyright (C) by Josh Blum. See LICENSE.txt for licensing information.
#ifndef INCLUDED_GRAS_FACTORY_HPP
#define INCLUDED_GRAS_FACTORY_HPP
#include <gras/gras.hpp>
#include <gras/element.hpp>
#include <PMC/PMC.hpp>
#include <string>
namespace gras
{
/*!
* Element factory:
* - Register factory functions into the global factory.
* - Call make() to create element from global factory.
*
* Example register a factory function:
* gras::Factory::register_factory("/proj/my_block", &make_my_block);
*
* Example call into the factory:
* gras::Element *my_block = gras::Factory::make("/proj/my_block", arg0, arg1);
*/
struct GRAS_API Factory
{
/*******************************************************************
* Private registration hooks
******************************************************************/
static void _register_factory(const std::string &, void *);
static Element *_handle_make(const std::string &, const PMCC &);
};
/***********************************************************************
* Register API - don't look here, template magic, not helpful
**********************************************************************/
#for $NARGS in range($MAX_ARGS)
template <typename ReturnType, $expand('typename A%d', $NARGS)>
static void register_factory(const std::string &path, ReturnType(*fcn)($expand('const A%d &', $NARGS)));
#end for
/***********************************************************************
* Make API - don't look here, template magic, not helpful
**********************************************************************/
#for $NARGS in range($MAX_ARGS)
template <$expand('typename A%d', $NARGS)>
static Element *make(const std::string &path, $expand('const A%d &', $NARGS));
#end for
}
/*!
* Register a block's factory function:
* Declare this macro at the global scope in a cpp file.
* The block will register at static initialization time.
*/
#define GRAS_REGISTER_FACTORY(path, fcn) \
GRAS_STATIC_BLOCK(fcn) \
{gras::register_factory(path, &fcn);}
#for $NARGS in range($MAX_ARGS)
/*!
* Register a block's constructor into the factory:
* The arguments to this macro must be the types of each constructor argument.
* Example: GRAS_REGISTER_FACTORY2("/proj/my_block", MyBlock, std::string, size_t)
* Declare this macro at the global scope in a cpp file.
* The block will register at static initialization time.
*/
#define GRAS_REGISTER_FACTORY$(NARGS)(path, type, $expand('A%d', $NARGS)) \
static gras::Element *make_ $('##') type($expand('const A%d &a%d', $NARGS)) \
{ return new type($expand('a%d', $NARGS)); } \
GRAS_REGISTER_FACTORY(path, make_$('##')type)
#end for
#include <gras/detail/factory.hpp>
#endif /*INCLUDED_GRAS_FACTORY_HPP*/
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