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Documentation about unique base functions.

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chriseth 2019-12-06 09:19:51 +01:00
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19
docs/contracts/inheritance.rst
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@ -237,8 +237,10 @@ bases, it has to explicitly override it:
function foo() public override(Base1, Base2) {}
}
A function defined in a common base contract does not have to be explicitly
overridden when used with multiple inheritance:
An explicit override specifier is not required if
the function is defined in a common base contract
or if there is a unique function in a common base contract
that already overrides all other functions.
::
@ -250,6 +252,19 @@ overridden when used with multiple inheritance:
// No explicit override required
contract D is B, C {}
More formally, it is not required to override a function (directly or
indirectly) inherited from multiple bases if there is a base contract
that is part of all override paths for the signature, and (1) that
base implements the function and no paths from the current contract
to the base mentions a function with that signature or (2) that base
does not implement the function and there is at most one mention of
the function in all paths from the current contract to that base.
In this sense, an override path for a signature is a path through
the inheritance graph that starts at the contract under consideration
and ends at a contract mentioning a function with that signature
that does not override.
.. note::
Functions with the ``private`` visibility cannot be ``virtual``.