Add a flag to indicate whether an array context permits inplace modification

arraycontext/context.py

@@ -103,7 +103,7 @@ THE SOFTWARE.
 """
 
 from typing import Sequence, Union
-from abc import ABC, abstractmethod
+from abc import ABC, abstractmethod, abstractproperty
 
 import numpy as np
 from pytools import memoize_method
@@ -349,6 +349,11 @@ class ArrayContext(ABC):
             "setup-only" array context "leaks" into the application.
         """
 
+    # undocumented for now
+    @abstractproperty
+    def permits_inplace_modification(self):
+        pass
+
 # }}}
 
 # vim: foldmethod=marker

arraycontext/impl/pyopencl.py

@@ -436,6 +436,9 @@ class PyOpenCLArrayContext(ArrayContext):
     def clone(self):
         return type(self)(self.queue, self.allocator, self._wait_event_queue_length)
 
+    def permits_inplace_modification(self):
+        return True
+
 # }}}
 
 # vim: foldmethod=marker