LSSTApplications  20.0.0
LSSTDataManagementBasePackage
readProxy.h
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1 // -*- lsst-c++ -*-
2 
3 /*
4  * LSST Data Management System
5  * Copyright 2008, 2009, 2010 LSST Corporation.
6  *
7  * This product includes software developed by the
8  * LSST Project (http://www.lsst.org/).
9  *
10  * This program is free software: you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation, either version 3 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18  * GNU General Public License for more details.
19  *
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22  * see <http://www.lsstcorp.org/LegalNotices/>.
23  */
24 
25 #ifndef LSST_DAF_PERSISTENCE_PYTHON_READPROXY_H
26 #define LSST_DAF_PERSISTENCE_PYTHON_READPROXY_H
27 
28 #include "pybind11/pybind11.h"
29 
30 namespace lsst {
31 namespace daf {
32 namespace persistence {
33 namespace python {
34 
44 public:
45  pybind11::object subject;
46 };
47 
56 template <typename OutputType> void register_proxy() {
57  namespace py = pybind11;
58  auto implicit_caster = [](PyObject *obj, PyTypeObject *type) -> PyObject * {
59  if (!py::detail::make_caster<lsst::daf::persistence::python::ReadProxyBase>().load(obj, false)) {
60  return nullptr;
61  }
62  PyObject *result = PyObject_GetAttrString(obj, "__subject__");
63  if (result == nullptr) {
64  PyErr_Clear(); // needed to fall through to next conversion
65  }
66  return result;
67  };
68 
69  if (auto tinfo = py::detail::get_type_info(typeid(OutputType))) {
70  tinfo->implicit_conversions.push_back(implicit_caster);
71  } else {
72  py::pybind11_fail("register_proxy: Unable to find type " + py::type_id<OutputType>());
73  }
74 }
75 
76 }}}}
77 
78 #endif
lsst::daf::persistence::python::register_proxy
void register_proxy()
Register a type for (optional) lazy load.
Definition: readProxy.h:56
result
py::object result
Definition: _schema.cc:429
lsst
A base class for image defects.
Definition: imageAlgorithm.dox:1
lsst::daf::persistence::python::ReadProxyBase::subject
pybind11::object subject
Definition: readProxy.h:45
type
table::Key< int > type
Definition: Detector.cc:163
lsst::daf::persistence::python::ReadProxyBase
Base class for lazy-loading proxy.
Definition: readProxy.h:43
pybind11
Definition: _GenericMap.cc:40