Feature exception2

corelib/src/libs/SireBase/CMakeLists.txt

@@ -115,6 +115,7 @@ set ( SIREBASE_SOURCES
       savestate.cpp
       sharedpolypointer.cpp
       slice.cpp
+      sparsematrix.cpp
       stringmangler.cpp
       stringproperty.cpp
       tempdir.cpp

corelib/src/libs/SireBase/sparsematrix.cpp

@@ -0,0 +1,69 @@
+/********************************************\
+  *
+  *  Sire - Molecular Simulation Framework
+  *
+  *  Copyright (C) 2024  Christopher Woods
+  *
+  *  This program is free software; you can redistribute it and/or modify
+  *  it under the terms of the GNU General Public License as published by
+  *  the Free Software Foundation; either version 3 of the License, or
+  *  (at your option) any later version.
+  *
+  *  This program is distributed in the hope that it will be useful,
+  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  *  GNU General Public License for more details.
+  *
+  *  You should have received a copy of the GNU General Public License
+  *  along with this program; if not, write to the Free Software
+  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+  *
+  *  For full details of the license please see the COPYING file
+  *  that should have come with this distribution.
+  *
+  *  You can contact the authors via the website
+  *  at https://sire.openbiosim.org
+  *
+\*********************************************/
+
+#include "sparsematrix.hpp"
+
+#include "sireglobal.h"
+
+using namespace SireBase;
+using namespace SireStream;
+
+static const auto sparse_magic = Sire::getMagic("SireBase::SparseMatrix");
+
+namespace SireBase
+{
+    namespace detail
+    {
+        void writeSparseMatrixMagic(QDataStream &ds, VersionID v)
+        {
+            SireStream::writeHeader(ds, sparse_magic, v);
+        }
+
+        VersionID checkSparseMatrixMagic(QDataStream &ds)
+        {
+            try
+            {
+                return SireStream::readHeader(ds, sparse_magic, "SireBase::SparseMatrix");
+            }
+            catch (const SireStream::magic_error &)
+            {
+                // have to assume this is an old-style sparse matrix
+                return 1;
+            }
+        }
+
+        void throwSparseMatrixMagicError(VersionID v, const QString &supported)
+        {
+            throw SireStream::version_error(
+                QObject::tr("Invalid version for SparseMatrix - got %1 but only version(s) %2 are supported")
+                    .arg(v)
+                    .arg(supported),
+                CODELOC);
+        }
+    }
+}