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Allow user-defined types as mapping keys in parser and restrict to contracts during type checking.

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Daniel Kirchner
2020-02-04 17:22:03 +01:00
parent 7a194ffdab
commit d3cbfb0c5c
25 changed files with 808 additions and 18 deletions
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docs/types/mapping-types.rst
+2 -3
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@@ -7,9 +7,8 @@ Mapping Types
Mapping types use the syntax ``mapping(_KeyType => _ValueType)`` and variables
of mapping type are declared using the syntax ``mapping(_KeyType => _ValueType) _VariableName``.
The ``_KeyType`` can be any
built-in value type plus ``bytes`` and ``string``. User-defined
or complex types such as contract types, enums, mappings, structs or array types
apart from ``bytes`` and ``string`` are not allowed.
built-in value type, ``bytes``, ``string``, or any contract or enum type. Other user-defined
or complex types, such as mappings, structs or array types are not allowed.
``_ValueType`` can be any type, including mappings, arrays and structs.
You can think of mappings as `hash tables <https://en.wikipedia.org/wiki/Hash_table>`_, which are virtually initialised