32 lines
1.1 KiB
Plaintext
32 lines
1.1 KiB
Plaintext
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@subsection Seal
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Some smart contract parameters may need to be mutable over part of a smart contract's lifetime.
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This interface provides a method to explicitly signal when certain parameters have been rendered immutable.
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The value of @code{sealState()} @emph{must not} decrease, and must not exceed @code{maxSealState}.
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@code{maxSealState} is used to define that @emph{all mutable parameters} have been rendered immutable. The practical implications of this will vary between contracts.
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The implementer is encouraged to use simple, descriptive names in the source code to describe the applicable seal states.
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Use cases of sealing include:
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@itemize
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@item
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Whether more tokens can be minted
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@item
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Allow ownership of a contract to be transferred
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@item
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The expiry time of a token (see @code{Expire})
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@end itemize
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@table @dfn
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@item ERC165 Interface identifier
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@include ../../build/Seal.interface
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@item Solidity interface definition
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@include ../../build/contract_Seal.texi
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@item Example implementation
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@uref{https://git.grassecon.net/cicnet/erc20-demurrage-token.git}
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@end table
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