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Slightly modified version of Henning's suggestion

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Philip Ginsbach
2020-05-29 12:41:58 +01:00
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parent bb9e800241
commit 2d47537f11
1 changed files with 1 additions and 2 deletions
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docs/language/ql-handbook/types.rst
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@@ -511,8 +511,7 @@ For example, the following construction is legal::
}
However, a similar implementation that restricts ``InitialValueSource`` in a class extension is not valid.
The class ``DefiniteInitialization`` triggers a type test for ``InitialValueSource``, which results in an illegal recursion
``DefiniteInitialization -> InitialValueSource -> UnknownInitialGarbage -> ¬DefiniteInitialization`` since ``UnknownInitialGarbage`` relies on ``DefiniteInitialization``::
If we had implemented ``DefiniteInitialization`` as a class extension instead, it would trigger a type test for ``InitialValueSource``. This results in an illegal recursion ``DefiniteInitialization -> InitialValueSource -> UnknownInitialGarbage -> ¬DefiniteInitialization`` since ``UnknownInitialGarbage`` relies on ``DefiniteInitialization``::
class DefiniteInitialization extends InitialValueSource {
DefiniteInitialization() {