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chriseth 2017-03-02 14:41:51 +01:00
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docs/contracts.rst
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@ -428,8 +428,10 @@ change by overriding).
Constant State Variables Constant State Variables
************************ ************************
State variables can be declared as constant (this is not yet implemented State variables can be declared as constant. In this case, they have to be
for array and struct types and not possible for mapping types). 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
replaced by their constant value (which might be computed by the optimizer).
:: ::
@ -438,12 +440,9 @@ for array and struct types and not possible for mapping types).
contract C { contract C {
uint constant x = 32**22 + 8; uint constant x = 32**22 + 8;
string constant text = "abc"; string constant text = "abc";
bytes32 constant myHash = keccak256("abc");
} }
This has the effect that the compiler does not reserve a storage slot
for these variables and every occurrence is replaced by their constant value.
The value expression can only contain integer arithmetics.
****************** ******************
Constant Functions Constant Functions