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Merge pull request #4780 from ethereum/enumData

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Clarify data representation of enums.
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chriseth 2018-08-14 17:11:39 +02:00 committed by GitHub
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docs/types.rst
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@ -368,6 +368,10 @@ Enums are one way to create a user-defined type in Solidity. They are explicitly
to and from all integer types but implicit conversion is not allowed. The explicit conversions to and from all integer types but implicit conversion is not allowed. The explicit conversions
check the value ranges at runtime and a failure causes an exception. Enums needs at least one member. check the value ranges at runtime and a failure causes an exception. Enums needs at least one member.
The data representation is the same as for enums in C: The options are represented by
subsequent unsigned integer values starting from ``0``.
:: ::
pragma solidity ^0.4.16; pragma solidity ^0.4.16;
@ -384,7 +388,7 @@ check the value ranges at runtime and a failure causes an exception. Enums need
// Since enum types are not part of the ABI, the signature of "getChoice" // Since enum types are not part of the ABI, the signature of "getChoice"
// will automatically be changed to "getChoice() returns (uint8)" // will automatically be changed to "getChoice() returns (uint8)"
// for all matters external to Solidity. The integer type used is just // for all matters external to Solidity. The integer type used is just
// large enough to hold all enum values, i.e. if you have more values, // large enough to hold all enum values, i.e. if you have more than 256 values,
// `uint16` will be used and so on. // `uint16` will be used and so on.
function getChoice() public view returns (ActionChoices) { function getChoice() public view returns (ActionChoices) {
return choice; return choice;