change ERC20Token to interface

This commit is contained in:
Ricardo Guilherme Schmidt 2018-05-07 23:37:45 -03:00
parent 37135766e7
commit bc3933b1f5
2 changed files with 37 additions and 25 deletions

View File

@ -1,48 +1,40 @@
pragma solidity ^0.4.17;
pragma solidity ^0.4.23;
// Abstract contract for the full ERC 20 Token standard
// https://github.com/ethereum/EIPs/issues/20
contract ERC20Token {
/* This is a slight change to the ERC20 base standard.
function totalSupply() constant returns (uint256 supply);
is replaced with:
uint256 public totalSupply;
This automatically creates a getter function for the totalSupply.
This is moved to the base contract since public getter functions are not
currently recognised as an implementation of the matching abstract
function by the compiler.
*/
/// total amount of tokens
uint256 public totalSupply;
interface ERC20Token {
/// @notice send `_value` token to `_to` from `msg.sender`
/// @param _to The address of the recipient
/// @param _value The amount of token to be transferred
/// @return Whether the transfer was successful or not
function transfer(address _to, uint256 _value) public returns (bool success);
function transfer(address _to, uint256 _value) external returns (bool success);
/// @notice `msg.sender` approves `_spender` to spend `_value` tokens
/// @param _spender The address of the account able to transfer the tokens
/// @param _value The amount of tokens to be approved for transfer
/// @return Whether the approval was successful or not
function approve(address _spender, uint256 _value) public returns (bool success);
function approve(address _spender, uint256 _value) external returns (bool success);
/// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
/// @param _from The address of the sender
/// @param _to The address of the recipient
/// @param _value The amount of token to be transferred
/// @return Whether the transfer was successful or not
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
function transferFrom(address _from, address _to, uint256 _value) external returns (bool success);
/// @param _owner The address from which the balance will be retrieved
/// @return The balance
function balanceOf(address _owner) public view returns (uint256 balance);
function balanceOf(address _owner) external view returns (uint256 balance);
/// @param _owner The address of the account owning tokens
/// @param _spender The address of the account able to transfer the tokens
/// @return Amount of remaining tokens allowed to spent
function allowance(address _owner, address _spender) public view returns (uint256 remaining);
function allowance(address _owner, address _spender) external view returns (uint256 remaining);
/// total amount of tokens
function totalSupply() external view returns (uint256 supply);
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);

View File

@ -4,6 +4,7 @@ import "./ERC20Token.sol";
contract StandardToken is ERC20Token {
uint256 private supply;
mapping (address => uint256) balances;
mapping (address => mapping (address => uint256)) allowed;
@ -13,14 +14,14 @@ contract StandardToken is ERC20Token {
address _to,
uint256 _value
)
public
external
returns (bool success)
{
return transfer(msg.sender, _to, _value);
}
function approve(address _spender, uint256 _value)
public
external
returns (bool success)
{
allowed[msg.sender][_spender] = _value;
@ -33,7 +34,7 @@ contract StandardToken is ERC20Token {
address _to,
uint256 _value
)
public
external
returns (bool success)
{
if (balances[_from] >= _value &&
@ -47,7 +48,7 @@ contract StandardToken is ERC20Token {
}
function allowance(address _owner, address _spender)
public
external
view
returns (uint256 remaining)
{
@ -55,13 +56,32 @@ contract StandardToken is ERC20Token {
}
function balanceOf(address _owner)
public
external
view
returns (uint256 balance)
{
return balances[_owner];
}
function totalSupply()
external
view
returns(uint256 supply)
{
return supply;
}
function mint(
address _to,
uint256 _amount
)
internal
{
balances[_to] += _amount;
supply += _amount;
emit Transfer(0x0, _to, _amount);
}
function transfer(
address _from,
address _to,