diff options
Diffstat (limited to 'docs/contracts.rst')
| -rw-r--r-- | docs/contracts.rst | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/docs/contracts.rst b/docs/contracts.rst index 986d05b3..e2fdf3f3 100644 --- a/docs/contracts.rst +++ b/docs/contracts.rst @@ -421,9 +421,9 @@ change by overriding). .. index:: ! constant -********** -Constants -********** +************************ +Constant State Variables +************************ State variables can be declared as constant (this is not yet implemented for array and struct types and not possible for mapping types). @@ -442,6 +442,27 @@ for these variables and every occurrence is replaced by their constant value. The value expression can only contain integer arithmetics. +****************** +Constant Functions +****************** + +Functions can be declared constant. These functions promise not to modify the state. + +:: + + pragma solidity ^0.4.0; + + contract C { + function f(uint a, uint b) constant returns (uint) { + return a * (b + 42); + } + } + +.. note:: + Accessor methods are marked constant. + +.. warning:: + The compiler does not enforce yet that a constant method is not modifying state. .. index:: ! fallback function, function;fallback |