disallow implicit conversion of Field to boolean

5ed8f324 · Martin Reinecke · 1e05a9ee · 5ed8f324
Commit 5ed8f324 authored May 16, 2018 by Martin Reinecke
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nifty4/field.py nifty4/field.py +7 -0

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--- a/nifty4/field.py
+++ b/nifty4/field.py
@@ -79,6 +79,13 @@ class Field(object):
        if locked:
            dobj.lock(self._val)

+    # prevent implicit conversion to bool
+    def __nonzero__(self):
+        raise TypeError("Field does not support implicit conversion to bool")
+
+    def __bool__(self):
+        raise TypeError("Field does not support implicit conversion to bool")
+
    @staticmethod
    def full(domain, val, dtype=None):
        """Creates a Field with a given domain, filled with a constant value.