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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __FN_MULTI_FUNCTION_CONTEXT_HH__
#define __FN_MULTI_FUNCTION_CONTEXT_HH__
/** \file
* \ingroup fn
*
* An #MFContext is passed along with every call to a multi-function. Right now it does nothing,
* but it can be used for the following purposes:
* - Pass debug information up and down the function call stack.
* - Pass reusable memory buffers to sub-functions to increase performance.
* - Pass cached data to called functions.
*/
#include "BLI_utildefines.h"
#include "BLI_map.hh"
namespace blender::fn {
class MFContext;
class MFContextBuilder {
private:
Map<std::string, const void *> global_contexts_;
friend MFContext;
public:
template<typename T> void add_global_context(std::string name, const T *context)
{
global_contexts_.add_new(std::move(name), (const void *)context);
}
};
class MFContext {
private:
MFContextBuilder &builder_;
public:
MFContext(MFContextBuilder &builder) : builder_(builder)
{
}
template<typename T> const T *get_global_context(StringRef name) const
{
const void *context = builder_.global_contexts_.lookup_default_as(name, nullptr);
/* TODO: Implement type checking. */
return (const T *)context;
}
};
} // namespace blender::fn
#endif /* __FN_MULTI_FUNCTION_CONTEXT_HH__ */
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