REF: Make CRS methods inheritable

pyproj4 · Aug 17, 2021 · ea2cc18 · ea2cc18
1 parent 43b7cff
commit ea2cc18
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Showing 5 changed files with 389 additions and 41 deletions.
diff --git a/docs/history.rst b/docs/history.rst
@@ -4,6 +4,8 @@ Change Log
 Latest
 ------
 - REF: Handle deprecation of proj_context_set_autoclose_database (issue #866)
+- REF: Make CRS methods inheritable (issue #847)
+- ENH: Added :attr:`pyproj.crs.CRS.is_derived` (pull #902)
 - DOC: Improve FAQ text about CRS formats (issue #789)
 - BUG: Add PyPy cython array implementation (issue #854)
 - BUG: Fix spelling for

diff --git a/pyproj/_crs.pyx b/pyproj/_crs.pyx
@@ -2490,7 +2490,7 @@ cdef class _CRS(Base):
             )
 
         if not (
-            self.is_bound or proj_is_derived_crs(self.context, self.projobj)
+            self.is_bound or self.is_derived
         ):
             self._coordinate_operation = False
             return None
@@ -2971,6 +2971,18 @@ cdef class _CRS(Base):
             return self.source_crs.is_geocentric
         return self._type == PJ_TYPE_GEOCENTRIC_CRS
 
+    @property
+    def is_derived(self):
+        """
+        .. versionadded:: 3.2.0
+
+        Returns
+        -------
+        bool:
+            True if CRS is a Derived CRS.
+        """
+        return proj_is_derived_crs(self.context, self.projobj) == 1
+
     def _equals(self, _CRS other, bint ignore_axis_order):
         if ignore_axis_order:
             # Only to be used with DerivedCRS/ProjectedCRS/GeographicCRS