PyScalarAccessor.h

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// SPDX-FileCopyrightText: Deutsches Elektronen-Synchrotron DESY, MSK, ChimeraTK Project <chimeratk-support@desy.de>
// SPDX-License-Identifier: LGPL-3.0-or-later
#pragma once
 
#include <pybind11/pybind11.h>
// pybind11.h must come first
 
#include "AccessorVariant.h"
#include "PyOwnershipManagement.h"
#include "PyTransferElement.h"
 
namespace py = pybind11;
 
namespace ChimeraTK {
 
  /********************************************************************************************************************/
 
  class PyScalarAccessor : public PyTransferElement<PyScalarAccessor>, public PyOwnedObject {
    // Helper for constructor - note: we can move templates to the .cc file if we use them only in the same .cc file
    template<template<typename> class AccessorType>
    static ScalarAccessorVariant createAccessor(ChimeraTK::DataType type, Module* owner, const std::string& name,
        const std::string& unit, const std::string& description, const std::unordered_set<std::string>& tags);
 
   public:
    PyScalarAccessor();
 
    template<template<typename> class AccessorType>
    PyScalarAccessor(AccessorTypeTag<AccessorType>, ChimeraTK::DataType type, Module* owner, const std::string& name,
        const std::string& unit, const std::string& description, const std::unordered_set<std::string>& tags = {});
 
    PyScalarAccessor(PyScalarAccessor&&) = default;
 
    ~PyScalarAccessor();
 
    UserTypeVariantNoVoid readAndGet();
 
    UserTypeVariantNoVoid get() const;
 
    void writeIfDifferent(UserTypeVariantNoVoid val);
 
    void setAndWrite(UserTypeVariantNoVoid val);
 
    void set(UserTypeVariantNoVoid val);
 
    static std::string repr(py::object& acc);
 
    static void bind(py::module& mod);
 
    // Needs to be mutable to have a const get function, despite a non-const getHighLevelImplElement function
    // get has to be const so it can be used in operator== which is expected by pibind11 to have const arguments.
    mutable ScalarAccessorVariant _accessor;
  };
 
  /********************************************************************************************************************/
 
} // namespace ChimeraTK