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swig/Lib/cpointer.i

+/* -----------------------------------------------------------------------------
+ * See the LICENSE file for information on copyright, usage and redistribution
+ * of SWIG, and the README file for authors - http://www.swig.org/release.html.
+ *
+ * cpointer.i
+ *
+ * SWIG library file containing macros that can be used to manipulate simple
+ * pointer objects.
+ * ----------------------------------------------------------------------------- */
+
+/* -----------------------------------------------------------------------------
+ * %pointer_class(type,name)
+ *
+ * Places a simple proxy around a simple type like 'int', 'float', or whatever.
+ * The proxy provides this interface:
+ *
+ *       class type {
+ *       public:
+ *           type();
+ *          ~type();
+ *           type value();
+ *           void assign(type value);
+ *       };
+ *         
+ * Example:
+ *
+ *    %pointer_class(int, intp);
+ *
+ *    int add(int *x, int *y) { return *x + *y; }
+ *
+ * In python (with proxies)
+ *
+ *    >>> a = intp()
+ *    >>> a.assign(10)
+ *    >>> a.value()
+ *    10
+ *    >>> b = intp()
+ *    >>> b.assign(20)
+ *    >>> print add(a,b)
+ *    30
+ *
+ * As a general rule, this macro should not be used on class/structures that
+ * are already defined in the interface.
+ * ----------------------------------------------------------------------------- */
+
+
+%define %pointer_class(TYPE, NAME)
+%{
+typedef TYPE NAME;
+%}
+
+typedef struct {
+} NAME;
+
+%extend NAME {
+#ifdef __cplusplus
+NAME() {
+  return new TYPE();
+}
+~NAME() {
+  if (self) delete self;
+}
+#else
+NAME() {
+  return (TYPE *) calloc(1,sizeof(TYPE));
+}
+~NAME() {
+  if (self) free(self);
+}
+#endif
+}
+
+%extend NAME {
+
+void assign(TYPE value) {
+  *self = value;
+}
+TYPE value() {
+  return *self;
+}
+TYPE * cast() {
+  return self;
+}
+static NAME * frompointer(TYPE *t) {
+  return (NAME *) t;
+}
+
+}
+
+%types(NAME = TYPE);
+
+%enddef
+
+/* ----------------------------------------------------------------------------- 
+ * %pointer_functions(type,name)
+ *
+ * Create functions for allocating/deallocating pointers.   This can be used
+ * if you don't want to create a proxy class or if the pointer is complex.
+ *
+ *    %pointer_functions(int, intp)
+ *
+ *    int add(int *x, int *y) { return *x + *y; }
+ *
+ * In python (with proxies)
+ *
+ *    >>> a = copy_intp(10)
+ *    >>> intp_value(a)
+ *    10
+ *    >>> b = new_intp()
+ *    >>> intp_assign(b,20)
+ *    >>> print add(a,b)
+ *    30
+ *    >>> delete_intp(a)
+ *    >>> delete_intp(b)
+ * 
+ * ----------------------------------------------------------------------------- */
+
+%define %pointer_functions(TYPE,NAME)
+%{
+static TYPE *new_##NAME() { %}
+#ifdef __cplusplus
+%{  return new TYPE(); %}
+#else
+%{  return (TYPE *) calloc(1,sizeof(TYPE)); %}
+#endif
+%{}
+
+static TYPE *copy_##NAME(TYPE value) { %}
+#ifdef __cplusplus
+%{  return new TYPE(value); %}
+#else
+%{  TYPE *self = (TYPE *) calloc(1,sizeof(TYPE));
+  *self = value;
+  return self; %}
+#endif
+%{}
+
+static void delete_##NAME(TYPE *self) { %}
+#ifdef __cplusplus
+%{  if (self) delete self; %}
+#else
+%{  if (self) free(self); %}
+#endif
+%{}
+
+static void NAME ##_assign(TYPE *self, TYPE value) {
+  *self = value;
+}
+
+static TYPE NAME ##_value(TYPE *self) {
+  return *self;
+}
+%}
+
+TYPE *new_##NAME();
+TYPE *copy_##NAME(TYPE value);
+void  delete_##NAME(TYPE *self);
+void  NAME##_assign(TYPE *self, TYPE value);
+TYPE  NAME##_value(TYPE *self);
+
+%enddef
+
+/* -----------------------------------------------------------------------------
+ * %pointer_cast(type1,type2,name)
+ *
+ * Generates a pointer casting function.
+ * ----------------------------------------------------------------------------- */
+
+%define %pointer_cast(TYPE1,TYPE2,NAME)
+%inline %{
+TYPE2 NAME(TYPE1 x) {
+   return (TYPE2) x;
+}
+%}
+%enddef
+
+
+
+
+
+
+
+