2e0713becb
* rename ERC20 to IERC20 * move ERC20.sol to IERC20.sol * rename StandardToken to ERC20 * rename StandardTokenMock to ERC20Mock * move StandardToken.sol to ERC20.sol, likewise test and mock files * rename MintableToken to ERC20Mintable * move MintableToken.sol to ERC20Mintable.sol, likewise test and mock files * rename BurnableToken to ERC20Burnable * move BurnableToken.sol to ERC20Burnable.sol, likewise for related files * rename CappedToken to ERC20Capped * move CappedToken.sol to ERC20Capped.sol, likewise for related files * rename PausableToken to ERC20Pausable * move PausableToken.sol to ERC20Pausable.sol, likewise for related files * rename DetailedERC20 to ERC20Detailed * move DetailedERC20.sol to ERC20Detailed.sol, likewise for related files * rename ERC721 to IERC721, and likewise for other related interfaces * move ERC721.sol to IERC721.sol, likewise for other 721 interfaces * rename ERC721Token to ERC721 * move ERC721Token.sol to ERC721.sol, likewise for related files * rename ERC721BasicToken to ERC721Basic * move ERC721BasicToken.sol to ERC721Basic.sol, likewise for related files * rename ERC721PausableToken to ERC721Pausable * move ERC721PausableToken.sol to ERC721Pausable.sol * rename ERC165 to IERC165 * move ERC165.sol to IERC165.sol * amend comment that ERC20 is based on FirstBlood * fix comments mentioning IERC721Receiver
30 lines
934 B
Solidity
30 lines
934 B
Solidity
pragma solidity ^0.4.24;
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/**
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* @title AutoIncrementing
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* @author Matt Condon (@shrugs)
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* @dev Provides an auto-incrementing uint256 id acquired by the `Counter#nextId` getter.
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* Use this for issuing ERC721 ids or keeping track of request ids, anything you want, really.
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*
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* Include with `using AutoIncrementing for AutoIncrementing.Counter;`
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* @notice Does not allow an Id of 0, which is popularly used to signify a null state in solidity.
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* Does not protect from overflows, but if you have 2^256 ids, you have other problems.
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* (But actually, it's generally impossible to increment a counter this many times, energy wise
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* so it's not something you have to worry about.)
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*/
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library AutoIncrementing {
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struct Counter {
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uint256 prevId; // default: 0
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}
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function nextId(Counter storage _counter)
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internal
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returns (uint256)
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{
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_counter.prevId = _counter.prevId + 1;
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return _counter.prevId;
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}
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}
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