Implement new specification of template type

Author: lysnikolaou

Include/internal/pycore_interpolation.h

@@ -18,6 +18,7 @@ extern PyTypeObject _PyInterpolation_Type;
 PyAPI_FUNC(PyObject *) _PyInterpolation_FromStackRefSteal(_PyStackRef *values);
 
 extern PyStatus _PyInterpolation_InitTypes(PyInterpreterState *interp);
+extern PyObject *_PyInterpolation_GetValue(PyObject *interpolation);
 
 #ifdef __cplusplus
 }

Include/internal/pycore_template.h

@@ -12,6 +12,7 @@ extern "C" {
 #include "pycore_stackref.h"    // _PyStackRef
 
 extern PyTypeObject _PyTemplate_Type;
+extern PyTypeObject _PyTemplateIter_Type;
 
 PyAPI_FUNC(PyObject *) _PyTemplate_FromValues(PyObject **values, Py_ssize_t n);
 PyAPI_FUNC(PyObject *) _PyTemplate_FromListStackRef(_PyStackRef ref);

Objects/interpolationobject.c

@@ -250,3 +250,9 @@ _PyInterpolation_FromStackRefSteal(_PyStackRef *values)
     Py_DECREF(args);
     return interpolation;
 }
+
+PyObject *
+_PyInterpolation_GetValue(PyObject *interpolation)
+{
+    return ((interpolationobject *) interpolation)->value;
+}

Objects/object.c

@@ -2398,6 +2398,7 @@ static PyTypeObject* static_types[] = {
     &_PyNoDefault_Type,
     &_PyInterpolation_Type,
     &_PyTemplate_Type,
+    &_PyTemplateIter_Type,
 
     // subclasses: _PyTypes_FiniTypes() deallocates them before their base
     // class