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swig/Lib/typemaps/inoutlist.swg

+/*  ------------------------------------------------------------
+ *
+ * Define the IN/OUTPUT typemaps assuming the output parameters are
+ * returned in a list, i.e., they are not directly modified.
+ *
+ * The user should provide the %append_output(result, obj) method,
+ * via a macro, which append a particular object to the result.
+ *
+ *
+ * In Tcl, for example, the file is used as:
+ *
+ *   #define %append_output(obj) Tcl_ListObjAppendElement(interp,Tcl_GetObjResult(interp),obj);
+ *   %include <typemaps/inoutlist.swg>
+ *
+ * while in Python it is used as:
+ *
+ *   #define %append_output(obj) $result = SWIG_Python_AppendResult($result, obj)
+ *   %include <typemaps/inoutlist.swg>
+ *
+ * where the method SWIG_Python_AppendResult is defined inside the
+ * %append_output fragment.
+ *
+ * If you forget to define %append_output, this file will generate
+ * an error.
+ *
+ * ------------------------------------------------------------ */
+
+
+//
+// Uncomment the following definition if you don't want the in/out
+// typemaps by default, ie, you prefer to use typemaps.i.
+//
+//#define SWIG_INOUT_NODEF
+
+//
+// Use the following definition to enable the INPUT parameters to
+// accept both 'by value' and 'pointer' objects.
+//
+#define SWIG_INPUT_ACCEPT_PTRS
+
+// ------------------------------------------------------------------------
+// Pointer handling
+//
+// These mappings provide support for input/output arguments and common
+// uses for C/C++ pointers.
+// ------------------------------------------------------------------------
+
+// INPUT typemaps.
+// These remap a C pointer to be an "INPUT" value which is passed by value
+// instead of reference.
+
+/* 
+The following methods can be applied to turn a pointer into a simple
+"input" value.  That is, instead of passing a pointer to an object,
+you would use a real value instead.
+         
+To use these, suppose you had a C function like this :
+
+        double fadd(double *a, double *b) {
+               return *a+*b;
+        }
+
+You could wrap it with SWIG as follows :
+
+        double fadd(double *INPUT, double *INPUT);
+
+or you can use the %apply directive :
+
+        %apply double *INPUT { double *a, double *b };
+        double fadd(double *a, double *b);
+
+*/
+#if defined(SWIG_INPUT_ACCEPT_PTRS)
+#define %check_input_ptr(input,arg,desc,disown) (SWIG_IsOK((res = SWIG_ConvertPtr(input,%as_voidptrptr(arg),desc,disown))))
+#else
+#define %check_input_ptr(input,arg,desc,disown) (SWIG_IsOK((res = SWIG_ERROR)))
+#endif
+
+%define %_value_input_typemap(code, asval_meth, asval_frag, Type)
+  %typemap(in,noblock=1,fragment=asval_frag) Type *INPUT ($*ltype temp, int res = 0) {
+    if (!%check_input_ptr($input,&$1,$descriptor,$disown)) {
+      Type val; 
+      int ecode = asval_meth($input, &val);
+      if (!SWIG_IsOK(ecode)) { 
+        %argument_fail(ecode, "$*ltype",$symname, $argnum);
+      }
+      temp = %static_cast(val, $*ltype);
+      $1 = &temp;
+      res = SWIG_AddTmpMask(ecode);
+    }
+  }
+  %typemap(in,noblock=1,fragment=asval_frag) Type &INPUT($*ltype temp, int res = 0) {
+    if (!%check_input_ptr($input,&$1,$descriptor,$disown)) {
+      Type val;
+      int ecode = asval_meth($input, &val);
+      if (!SWIG_IsOK(ecode)) { 
+        %argument_fail(ecode, "$*ltype",$symname, $argnum);
+      }
+      temp = %static_cast(val, $*ltype);
+      $1 = &temp;
+      res = SWIG_AddTmpMask(ecode);
+    }
+  }
+  %typemap(freearg,noblock=1,match="in") Type *INPUT, Type &INPUT {
+    if (SWIG_IsNewObj(res$argnum)) %delete($1);
+  }
+  %typemap(typecheck,noblock=1,precedence=code,fragment=asval_frag) Type *INPUT, Type &INPUT {
+    void *ptr = 0;
+    int res = asval_meth($input, 0);
+    $1 = SWIG_CheckState(res);
+    if (!$1) {
+      $1 = %check_input_ptr($input,&ptr,$1_descriptor,0);
+    }
+  }
+%enddef
+
+%define %_ptr_input_typemap(code,asptr_meth,asptr_frag,Type)
+  %typemap(in,noblock=1,fragment=asptr_frag) Type *INPUT(int res = 0) {  
+    res = asptr_meth($input, &$1);
+    if (!SWIG_IsOK(res)) {
+      %argument_fail(res,"$type",$symname, $argnum);
+    }
+    res = SWIG_AddTmpMask(res);
+  }
+  %typemap(in,noblock=1,fragment=asptr_frag) Type &INPUT(int res = 0) {  
+    res = asptr_meth($input, &$1);
+    if (!SWIG_IsOK(res)) { 
+      %argument_fail(res,"$type",$symname, $argnum);
+    }     
+    if (!$1) { 
+      %argument_nullref("$type",$symname, $argnum);
+    }
+    res = SWIG_AddTmpMask(res);
+  }
+  %typemap(freearg,noblock=1,match="in") Type *INPUT, Type &INPUT {
+    if (SWIG_IsNewObj(res$argnum)) %delete($1);
+  }
+  %typemap(typecheck,noblock=1,precedence=code,fragment=asptr_frag) Type *INPUT, Type &INPUT {
+    int res = asptr_meth($input, (Type**)0);
+    $1 = SWIG_CheckState(res);
+  }
+%enddef
+
+// OUTPUT typemaps.   These typemaps are used for parameters that
+// are output only.   The output value is appended to the result as
+// a list element.
+
+/* 
+The following methods can be applied to turn a pointer into an "output"
+value.  When calling a function, no input value would be given for
+a parameter, but an output value would be returned.  In the case of
+multiple output values, they are returned in the form of a list.
+
+         
+For example, suppose you were trying to wrap the modf() function in the
+C math library which splits x into integral and fractional parts (and
+returns the integer part in one of its parameters):
+
+        double modf(double x, double *ip);
+
+You could wrap it with SWIG as follows :
+
+        double modf(double x, double *OUTPUT);
+
+or you can use the %apply directive :
+
+        %apply double *OUTPUT { double *ip };
+        double modf(double x, double *ip);
+
+The output of the function would be a list containing both output
+values.
+
+*/
+
+%define %_value_output_typemap(from_meth, from_frag, Type)
+ %typemap(in,numinputs=0,noblock=1) 
+   Type *OUTPUT ($*1_ltype temp, int res = SWIG_TMPOBJ), 
+   Type &OUTPUT ($*1_ltype temp, int res = SWIG_TMPOBJ) {
+   $1 = &temp;
+ }
+ %typemap(argout,noblock=1,fragment=from_frag) Type *OUTPUT, Type &OUTPUT {
+   if (SWIG_IsTmpObj(res$argnum)) {
+     %append_output(from_meth((*$1)));
+   } else {
+     int new_flags = SWIG_IsNewObj(res$argnum) ? (SWIG_POINTER_OWN | %newpointer_flags) : %newpointer_flags;
+     %append_output(SWIG_NewPointerObj((void*)($1), $1_descriptor, new_flags));
+   }
+ }
+%enddef
+
+
+// INOUT
+// Mappings for an argument that is both an input and output
+// parameter
+
+/*
+The following methods can be applied to make a function parameter both
+an input and output value.  This combines the behavior of both the
+"INPUT" and "OUTPUT" methods described earlier.  Output values are
+returned in the form of a list.  
+         
+For example, suppose you were trying to wrap the following function :
+
+        void neg(double *x) {
+             *x = -(*x);
+        }
+
+You could wrap it with SWIG as follows :
+
+        void neg(double *INOUT);
+
+or you can use the %apply directive :
+
+        %apply double *INOUT { double *x };
+        void neg(double *x);
+
+Unlike C, this mapping does not directly modify the input value.
+Rather, the modified input value shows up as the return value of the
+function.  Thus, to apply this function to a variable you might do
+this :
+
+       x = neg(x)
+
+Note : previous versions of SWIG used the symbol 'BOTH' to mark
+input/output arguments.   This is still supported, but will be slowly
+phased out in future releases.
+
+*/
+
+%define %_value_inout_typemap(Type)
+ %typemap(in) Type *INOUT = Type *INPUT;
+ %typemap(in) Type &INOUT = Type &INPUT;
+ %typemap(typecheck) Type *INOUT = Type *INPUT;
+ %typemap(typecheck) Type &INOUT = Type &INPUT;
+ %typemap(argout) Type *INOUT = Type *OUTPUT;
+ %typemap(argout) Type &INOUT = Type &OUTPUT;
+%enddef
+
+
+%define %_ptr_inout_typemap(Type)
+ %_value_inout_typemap(%arg(Type))
+ %typemap(typecheck) Type *INOUT = Type *INPUT;
+ %typemap(typecheck) Type &INOUT = Type &INPUT;
+ %typemap(freearg) Type *INOUT = Type *INPUT;
+ %typemap(freearg) Type &INOUT = Type &INPUT;
+%enddef
+
+#ifndef SWIG_INOUT_NODEF
+
+%define %value_input_typemap(code,asval_meth, asval_frag, Type...)
+  %_value_input_typemap(%arg(code),%arg(asval_meth),%arg(asval_frag),%arg(Type))
+%enddef
+
+%define %ptr_input_typemap(code,asval_meth,asval_frag,Type...)          
+  %_ptr_input_typemap(%arg(code),%arg(asval_meth),%arg(asval_frag),%arg(Type))
+%enddef
+
+%define %value_output_typemap(from_meth,from_frag,Type...)              
+  %_value_output_typemap(%arg(from_meth),%arg(from_frag),%arg(Type))
+%enddef
+
+#define %value_inout_typemap(Type...) %_value_inout_typemap(%arg(Type))
+#define %ptr_inout_typemap(Type...) %_ptr_inout_typemap(%arg(Type))
+
+#else /* You need to include typemaps.i */
+
+
+#define %value_output_typemap(Type...)
+#define %value_input_typemap(Type...)
+#define %value_inout_typemap(Type...)
+#define %ptr_input_typemap(Type...)
+#define %ptr_inout_typemap(Type...)
+
+#endif /* SWIG_INOUT_DEFAULT */
+
+/*----------------------------------------------------------------------
+  Front ends.
+  
+  use the following macros to define your own IN/OUTPUT/INOUT typemaps
+  
+  ------------------------------------------------------------------------*/
+%define %typemaps_inout(Code, AsValMeth, FromMeth, AsValFrag, FromFrag, Type...)
+  %_value_input_typemap(%arg(Code), %arg(AsValMeth), 
+                            %arg(AsValFrag), %arg(Type));
+  %_value_output_typemap(%arg(FromMeth), %arg(FromFrag), %arg(Type));
+  %_value_inout_typemap(%arg(Type));
+%enddef
+
+%define %typemaps_inoutn(Code,Type...)
+  %typemaps_inout(%arg(Code),
+                 %arg(SWIG_AsVal(Type)), 
+                 %arg(SWIG_From(Type)), 
+                 %arg(SWIG_AsVal_frag(Type)), 
+                 %arg(SWIG_From_frag(Type)), 
+                 %arg(Type));
+%enddef