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docs: some types cannot be the key type for mappings

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Yoichi Hirai 2016-11-21 12:47:40 +01:00
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docs/types.rst
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@ -729,9 +729,9 @@ assigning it to a local variable, as in
Mappings
========
Mapping types are declared as ``mapping _KeyType => _ValueType``, where
``_KeyType`` can be almost any type except for a mapping and ``_ValueType``
can actually be any type, including mappings.
Mapping types are declared as ``mapping _KeyType => _ValueType``.
Here ``_KeyType`` can be almost any type except for a mapping, a dynamically sized array, a contract, an enum and a struct.
``_ValueType`` can actually be any type, including mappings.
Mappings can be seen as hashtables which are virtually initialized such that
every possible key exists and is mapped to a value whose byte-representation is