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Diffstat (limited to 'docs/contracts.rst')
| -rw-r--r-- | docs/contracts.rst | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/docs/contracts.rst b/docs/contracts.rst index 8cc4f6b2..c4eda8dc 100644 --- a/docs/contracts.rst +++ b/docs/contracts.rst @@ -40,7 +40,7 @@ This means that cyclic creation dependencies are impossible. :: - pragma solidity ^0.4.16; + pragma solidity ^0.4.20; // should actually be 0.4.21 contract OwnedToken { // TokenCreator is a contract type that is defined below. @@ -52,7 +52,7 @@ This means that cyclic creation dependencies are impossible. // This is the constructor which registers the // creator and the assigned name. - function OwnedToken(bytes32 _name) public { + constructor(bytes32 _name) public { // State variables are accessed via their name // and not via e.g. this.owner. This also applies // to functions and especially in the constructors, @@ -976,11 +976,32 @@ virtual method lookup. Constructors ============ -A constructor is an optional function with the same name as the contract which is executed upon contract creation. +A constructor is an optional function declared with the ``constructor`` keyword which is executed upon contract creation. Constructor functions can be either ``public`` or ``internal``. :: + pragma solidity ^0.4.20; // should actually be 0.4.21 + + contract A { + uint public a; + + constructor(uint _a) internal { + a = _a; + } + } + + contract B is A(1) { + constructor() public {} + } + +A constructor set as ``internal`` causes the contract to be marked as :ref:`abstract <abstract-contract>`. + +.. note :: + Prior to version 0.4.21, constructors were defined as functions with the same name as the contract. This syntax is now deprecated. + +:: + pragma solidity ^0.4.11; contract A { @@ -995,7 +1016,6 @@ Constructor functions can be either ``public`` or ``internal``. function B() public {} } -A constructor set as ``internal`` causes the contract to be marked as :ref:`abstract <abstract-contract>`. .. index:: ! base;constructor @@ -1009,11 +1029,11 @@ the base constructors. This can be done in two ways:: contract Base { uint x; - function Base(uint _x) public { x = _x; } + constructor(uint _x) public { x = _x; } } contract Derived is Base(7) { - function Derived(uint _y) Base(_y * _y) public { + constructor(uint _y) Base(_y * _y) public { } } |