Ichthyostega
9f19f5d895
turns out to be quite tricky, due to the overly convoluted implementation of PolymorphicValue (which looks quite dated, generally speaking, and could use a complete overhaul). - pass the basic value type as template parameter through the Builder - allow for the ability to define an initial value for the parameter - invoke the protected constructor of PolymorphicValue, directly passing a ''type tag'' to specify the implementation data package to be placed into the embedded data buffer
115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
/*
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PARAMETER.hpp - generic parameter values
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Copyright (C)
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2008,2026 Hermann Vosseler <Ichthyostega@web.de>
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**Lumiera** is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version. See the file COPYING for further details.
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*/
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/** @file parameter.hpp
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** A generic typed value that can be discovered and automated.
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** The actual data type of the parameter is an opaque implementation detail,
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** yet value ranges and conversions are handled automatically. It is thus
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** both a descriptor and an opaque container. Parameter elements can be copied,
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** yet the presence of some specific parameter at a given point in the model
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** constitutes an identity -- and the parameter descriptor can be tagged
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** with that identity.
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**
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** @todo this is a draft and placeholder, as of 2026
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*/
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#ifndef LIB_PAR_PARAMETER_H
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#define LIB_PAR_PARAMETER_H
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#include "lib/par/disposition.hpp"
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#include "lib/polymorphic-value.hpp"
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#include <utility>
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namespace lib {
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namespace par {
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namespace {
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static constexpr size_t BUFF_SIZ = sizeof(ParamData<double>);
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using ParameterImplAPI = Disposition;
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using CopySupportMarker = polyvalue::CopySupport<ParameterImplAPI>;
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using ParamContainer = PolymorphicValue<ParameterImplAPI, BUFF_SIZ, CopySupportMarker>;
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}
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/**
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* Descriptor and container to hold a generic parameter.
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* The value can be fixed or supplied by an automation function.
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*/
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class Parameter
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: protected ParamContainer
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{
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public:
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template<typename VAL>
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class Builder;
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template<typename VAL>
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VAL getVal();
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template<typename VAL>
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void setVal (VAL&&);
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/* === Builder API === */
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template<typename VAL>
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static Builder<VAL>
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forType() { return {}; }
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protected:
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template<class IMP, typename...ARGS>
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Parameter (IMP* typeTag, ARGS&&... args)
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: PolymorphicValue (typeTag, std::forward<ARGS>(args)...)
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{ }
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};
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template<typename VAL>
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class Parameter::Builder
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{
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VAL initVal_{};
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public:
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Parameter
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build()
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{
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using ImplPackage = ParamData<VAL>;
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ImplPackage* typeTag{nullptr};
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Parameter resParam{typeTag, std::move (initVal_)};
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return resParam;
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}
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};
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template<typename VAL>
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VAL
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Parameter::getVal()
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{
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UNIMPLEMENTED ("extract the »value«, possibly applying suitable type conversions");
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}
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template<typename VAL>
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void
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Parameter::setVal (VAL&& changedVal)
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{
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UNIMPLEMENTED ("apply suitable type conversions and clamping, then transfer the new value into the Provision interface");
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}
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}} // namespace lib::par
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#endif /*LIB_PAR_PARAMETER_H*/
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