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/* -----------------------------------------------------------------------------
* cpointer.swg
*
* This library file contains 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 {
NAME() {
return %new_instance(TYPE);
}
~NAME() {
if ($self) %delete($self);
}
}
%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() {
return %new_instance(TYPE);
}
static TYPE *copy_##NAME(TYPE value) {
return %new_copy(value, TYPE);
}
static void delete_##NAME(TYPE *obj) {
if (obj) %delete(obj);
}
static void NAME ##_assign(TYPE *obj, TYPE value) {
*obj = value;
}
static TYPE NAME ##_value(TYPE *obj) {
return *obj;
}
%}
TYPE *new_##NAME();
TYPE *copy_##NAME(TYPE value);
void delete_##NAME(TYPE *obj);
void NAME##_assign(TYPE *obj, TYPE value);
TYPE NAME##_value(TYPE *obj);
%enddef
/* -----------------------------------------------------------------------------
* %pointer_cast(type1,type2,name)
*
* Generates a pointer casting function.
* ----------------------------------------------------------------------------- */
%define %pointer_cast(TYPE1,TYPE2,NAME)
%inline %{
TYPE2 NAME(TYPE1 x) {
return %static_cast(x, TYPE2);
}
%}
%enddef
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