Ichthyostega
5df93f01fc
...taking into account the prospecive usage context where the builder expressions will be invoked from within a media-library plug-in, using std::string_view to pass the symbolic information seems like a good fit, because the given spec will typically be assembled from some building blocks, and thus in itself not be literal data.
97 lines
3 KiB
C++
97 lines
3 KiB
C++
/*
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PROC-ID.hpp - symbolic and hash identification of processing steps
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Copyright (C) Lumiera.org
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2024, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/** @file proc-id.hpp
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** Metadata interface to generate symbolic and hash ID tags for media processing steps.
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** Functionality is provided to identify a point in the processing chain for sake of
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** error reporting and unit testing; moreover, identifying information can be chained
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** and combined into a systematic hash key, to serve as foundation for a stable cache key.
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** @todo WIP-WIP as of 10/2024 this is a draft created as an aside while working towards
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** the first integration of render engine functionality //////////////////////////////////////////////TICKET #1377 : establish a systematic processing identification
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** @remark the essential requirement for a systematic and stable cache key is
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** - to be be re-generated directly from the render node network
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** - to be differing if and only if the underlying processing structure changes
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**
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** @see turnout.hpp
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** @see engine::ProcNodeDiagnostic
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** @see proc-node.cpp for the implementation backend
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*/
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#ifndef ENGINE_PROC_ID_H
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#define ENGINE_PROC_ID_H
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#include "lib/hash-standard.hpp"
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#include "lib/error.hpp"
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//#include "steam/streamtype.hpp"
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#include <string>
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namespace steam {
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namespace engine {
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namespace err = lumiera::error;
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using lib::HashVal;
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using std::string;
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using StrView = std::string_view;
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class ProcID
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{
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string nodeSymb_;
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string portQual_;
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string argLists_;
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ProcID (StrView nodeSymb, StrView portQual, StrView argLists);
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public:
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/** build and register a processing ID descriptor */
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static ProcID& describe (StrView nodeSymb, StrView portSpec);
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/* === symbolic descriptors === */
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string
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genProcSpec()
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{
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return "Lalü";
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}
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friend bool
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operator== (ProcID const& l, ProcID const& r)
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{
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return l.nodeSymb_ == r.nodeSymb_
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and l.portQual_ == r.portQual_
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and l.argLists_ == r.argLists_;
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}
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friend bool
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operator!= (ProcID const& l, ProcID const& r)
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{ return not (l == r); }
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};
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HashVal hash_value (ProcID const&);
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}} // namespace steam::engine
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#endif /*ENGINE_PROC_ID_H*/
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