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LSST Data Management Base Package
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MapSplit.cc
Go to the documentation of this file.
1/*
2 * LSST Data Management System
3 * Copyright 2017 AURA/LSST.
4 *
5 * This product includes software developed by the
6 * LSST Project (http://www.lsst.org/).
7 *
8 * This program is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 3 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the LSST License Statement and
19 * the GNU General Public License along with this program. If not,
20 * see <https://www.lsstcorp.org/LegalNotices/>.
21 */
22#include <cmath>
23#include <limits>
24#include <sstream>
25#include <stdexcept>
26
27#include "astshim/base.h"
29#include "astshim/Object.h"
30#include "astshim/Mapping.h"
31#include "astshim/MapSplit.h"
32
33namespace ast {
34
36 std::vector<int> locOut;
37 locOut.reserve(map.getNOut()); // the max # of elements astMapSplit may set
38 AstMapping *rawSplitMap;
39 astMapSplit(map.getRawPtr(), in.size(), in.data(), locOut.data(), &rawSplitMap);
40 assertOK();
41 if (!rawSplitMap) {
42 throw std::runtime_error("Could not split the map");
43 }
44 splitMap = Object::fromAstObject<Mapping>(reinterpret_cast<AstObject *>(rawSplitMap), false);
45 origIn = in;
46 // copy the splitMap->getNOut() elements of `locOut` that contain data to `origOut`
47 const int newNOut = splitMap->getNOut();
48 for (int i = 0; i < newNOut; ++i) {
49 origOut.push_back(locOut[i]);
50 }
51}
52
53} // namespace ast
MapSplit(Mapping const &map, std::vector< int > const &in)
Construct a MapSplit.
Definition MapSplit.cc:35
std::shared_ptr< Mapping > splitMap
The Mapping that was split off.
Definition MapSplit.h:67
std::vector< int > origIn
Indices of the inputs of the original mapping were picked for the split mapping.
Definition MapSplit.h:73
std::vector< int > origOut
Indices of the outputs of the original mapping which are fed by the picked inputs.
Definition MapSplit.h:83
An abstract base class for objects which transform one set of coordinates to another.
Definition Mapping.h:59
int getNOut() const
Get NOut: the number of output axes.
Definition Mapping.h:82
static std::shared_ptr< Class > fromAstObject(AstObject *rawObj, bool copy)
Given a bare AST object pointer return a shared pointer to an ast::Object of the correct type.
Definition Object.cc:138
AstObject const * getRawPtr() const
Get the raw AST pointer.
Definition Object.h:292
T data(T... args)
AST wrapper classes and functions.
void assertOK(AstObject *rawPtr1=nullptr, AstObject *rawPtr2=nullptr)
Throw std::runtime_error if AST's state is bad.
Definition base.cc:49
T reserve(T... args)