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Diffstat (limited to 'docs/contracts.rst')
| -rw-r--r-- | docs/contracts.rst | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/docs/contracts.rst b/docs/contracts.rst index 50e7f3d1..ef09d935 100644 --- a/docs/contracts.rst +++ b/docs/contracts.rst @@ -469,9 +469,20 @@ View Functions Functions can be declared ``view`` in which case they promise not to modify the state. +The following statements are considered modifying the state: + +#. Writing to state variables. +#. :ref:`Emitting events. <events>`. +#. :ref:`Creating other contracts <creating-contracts>`. +#. Using ``selfdestruct``. +#. Sending Ether via calls. +#. Calling any function not marked ``view`` or ``pure``. +#. Using low-level calls. +#. Using inline assembly that contains certain opcodes. + :: - pragma solidity ^0.4.0; + pragma solidity ^0.4.16; contract C { function f(uint a, uint b) view returns (uint) { @@ -496,9 +507,16 @@ Pure Functions Functions can be declared ``pure`` in which case they promise not to read from or modify the state. +In addition to the list of state modifying statements explained above, the following are considered reading from the state: +#. Reading from state variables. +#. Accessing ``this.balance`` or ``<address>.balance``. +#. Accessing any of the members of ``block``, ``tx``, ``msg`` (with the exception of ``msg.sig`` and ``msg.data``). +#. Calling any function not marked ``pure``. +#. Using inline assembly that contains certain opcodes. + :: - pragma solidity ^0.4.0; + pragma solidity ^0.4.16; contract C { function f(uint a, uint b) pure returns (uint) { |