67 lines
2.9 KiB
Solidity
67 lines
2.9 KiB
Solidity
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// Abstract contract for the full ERC 20 Token standard
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// https://github.com/ethereum/EIPs/issues/20
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pragma solidity ^0.4.18;
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/**
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* @title EIP20NonStandardInterface
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* @dev Version of ERC20 with no return values for `transfer` and `transferFrom`
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* See https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
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*/
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contract EIP20NonStandardInterface {
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/* This is a slight change to the ERC20 base standard.
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function totalSupply() constant returns (uint256 supply);
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is replaced with:
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uint256 public totalSupply;
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This automatically creates a getter function for the totalSupply.
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This is moved to the base contract since public getter functions are not
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currently recognised as an implementation of the matching abstract
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function by the compiler.
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*/
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/// total amount of tokens
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uint256 public totalSupply;
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/// @param _owner The address from which the balance will be retrieved
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/// @return The balance
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function balanceOf(address _owner) public view returns (uint256 balance);
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///
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/// !!!!!!!!!!!!!!
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/// !!! NOTICE !!! `transfer` does not return a value, in violation of the ERC-20 specification
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/// !!!!!!!!!!!!!!
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///
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/// @notice send `_value` token to `_to` from `msg.sender`
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/// @param _to The address of the recipient
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/// @param _value The amount of token to be transferred
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/// @return Whether the transfer was successful or not
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function transfer(address _to, uint256 _value) public;
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///
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/// !!!!!!!!!!!!!!
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/// !!! NOTICE !!! `transferFrom` does not return a value, in violation of the ERC-20 specification
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/// !!!!!!!!!!!!!!
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///
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/// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
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/// @param _from The address of the sender
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/// @param _to The address of the recipient
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/// @param _value The amount of token to be transferred
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/// @return Whether the transfer was successful or not
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function transferFrom(address _from, address _to, uint256 _value) public;
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/// @notice `msg.sender` approves `_spender` to spend `_value` tokens
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/// @param _spender The address of the account able to transfer the tokens
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/// @param _value The amount of tokens to be approved for transfer
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/// @return Whether the approval was successful or not
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function approve(address _spender, uint256 _value) public returns (bool success);
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/// @param _owner The address of the account owning tokens
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/// @param _spender The address of the account able to transfer the tokens
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/// @return Amount of remaining tokens allowed to spent
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function allowance(address _owner, address _spender) public view returns (uint256 remaining);
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// solhint-disable-next-line no-simple-event-func-name
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event Transfer(address indexed _from, address indexed _to, uint256 _value);
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event Approval(address indexed _owner, address indexed _spender, uint256 _value);
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}
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