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Document function selectors

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Alex Beregszaszi 2017-07-11 18:10:42 +01:00
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docs/abi-spec.rst
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@ -17,6 +17,8 @@ We assume the interface functions of a contract are strongly typed, known at com
This specification does not address contracts whose interface is dynamic or otherwise known only at run-time. Should these cases become important they can be adequately handled as facilities built within the Ethereum ecosystem. This specification does not address contracts whose interface is dynamic or otherwise known only at run-time. Should these cases become important they can be adequately handled as facilities built within the Ethereum ecosystem.
.. _abi_function_selector:
Function Selector Function Selector
================= =================

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docs/types.rst
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@ -400,6 +400,17 @@ Note that public functions of the current contract can be used both as an
internal and as an external function. To use ``f`` as an internal function, internal and as an external function. To use ``f`` as an internal function,
just use ``f``, if you want to use its external form, use ``this.f``. just use ``f``, if you want to use its external form, use ``this.f``.
Additionally, public (or external) functions also have a special member called ``selector``,
which returns the :ref:`ABI function selector <abi_function_selector>`::
pragma solidity ^0.4.0;
contract Selector {
function f() returns (bytes4) {
return this.f.selector;
}
}
Example that shows how to use internal function types:: Example that shows how to use internal function types::
pragma solidity ^0.4.5; pragma solidity ^0.4.5;