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Extend documentation for constant state variables.

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chriseth 2017-03-09 14:39:30 +01:00
parent 592cec7e90
commit bdbd3b158e
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docs/contracts.rst
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@ -429,8 +429,15 @@ Constant State Variables
************************
State variables can be declared as constant. In this case, they have to be
assigned a value or expression which is a constant at compile time. The compiler does
not reserve a storage slot for these variables and every occurrence is
assigned a value or expression which is a constant at compile time. Expressions
that might have a side-effect on memory allocation are allowed, but those that
might have a side-effect on other memory objects are not. This makes it possible
to create constant memory arrays as lookup-tables
(although this is not yet fully implemented).
Expressions that depend on blockchain data like `now`, `this.balance` or
`block.number` or perform any storage access are disallowed.
The compiler does not reserve a storage slot for these variables and every occurrence is
replaced by their constant value (which might be computed by the optimizer).
Not all types for constants are implemented at this time. The only supported types are