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Update contracts.rst

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Extended example according to the discussed stuff, clarification & typos
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Mircea Moca 2016-08-18 14:16:01 +03:00 committed by GitHub
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@ -179,7 +179,7 @@ and the default is ``internal``.
.. note:: .. note::
Everything that is inside a contract is visible to Everything that is inside a contract is visible to
all external observers. Making something ``private`` all external observers. Making something ``private``
only prevents other contract from accessing and modifying only prevents other contracts from accessing and modifying
the information, but it will still be visible to the the information, but it will still be visible to the
whole world outside of the blockchain. whole world outside of the blockchain.
@ -194,9 +194,16 @@ return parameter list for functions.
function setData(uint a) internal { data = a; } function setData(uint a) internal { data = a; }
uint public data; uint public data;
} }
contract Caller {
function readData(){
C c = new C();
uint local = c.data(); // call accessor
local = f(7); // error
}
}
Other contracts can call ``c.data()`` to retrieve the value of data in state Other contracts can call ``c.data()`` to retrieve the value of data in state
storage, but are not able to call ``f``. Contracts derived from ``c`` can call storage, but are not able to call ``f``. Contracts derived from ``C`` can call
``setData`` to alter the value of ``data`` (but only in their own state). ``setData`` to alter the value of ``data`` (but only in their own state).
.. index:: ! accessor;function, ! function;accessor .. index:: ! accessor;function, ! function;accessor
@ -205,16 +212,16 @@ Accessor Functions
================== ==================
The compiler automatically creates accessor functions for The compiler automatically creates accessor functions for
all public state variables. The contract given below will all public state variables. For the contract given below the compiler will
have a function called ``data`` that does not take any generate a function called ``data`` that does not take any
arguments and returns a uint, the value of the state arguments and returns a ``uint``, the value of the state
variable ``data``. The initialization of state variables can variable ``data``. The initialization of state variables can
be done at declaration. be done at declaration.
The accessor functions have external visibility. If the The accessor functions have external visibility. If the
symbol is accessed internally (i.e. without ``this.``), symbol is accessed internally (i.e. without ``this.``),
it is a state variable and if it is accessed externally it is evaluated as state variable and if it is accessed externally
(i.e. with ``this.``), it is a function. (i.e. with ``this.``), it is evaluated as function.
:: ::