initial

1 files changed, 53 insertions, 0 deletions

diff --git a/include/handling.h b/include/handling.h
new file mode 100644
index 0000000..c5e0691
--- /dev/null
+++ b/include/handling.h
@@ -0,0 +1,53 @@
+/*
+    handling.h
+    Copyright (C) 2021 Richard Knight
+
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser 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
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program; if not, write to the Free Software Foundation,
+    Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ 
+ */
+#include <plugin.h>
+
+const char* handleIdentifier = "::%s%d";
+
+/*
+ * Obtain global object of typename from global variables by handle
+ */
+template <typename T>
+T* getHandle(csnd::Csound* csound, MYFLT handle, const char* name) {
+    char buffer[32];
+    snprintf(buffer, 32, handleIdentifier, name, (int)handle);
+    return (T*) csound->query_global_variable(buffer);  
+}
+
+
+/*
+ * Create global object of typename in global variables, returning handle
+ */
+template <typename T>
+MYFLT createHandle(csnd::Csound* csound, T** data, const char* name) {
+    char buffer[32];
+    int handle = 0;
+    snprintf(buffer, 32, handleIdentifier, name, handle);
+    while ((*data = (T*) csound->query_global_variable(buffer)) != NULL) {
+        snprintf(buffer, 32, handleIdentifier, name, ++handle);
+    }
+    csound->create_global_variable(buffer, sizeof(T));
+    *data = (T*) csound->query_global_variable(buffer);
+    
+    return FL(handle);
+}
+
+