// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
import 'https://github.com/Exchange-M/NFT-ERC721/blob/master/ERC721.sol';
contract Minty_ERC721 is Minty, ERC721 {
// Counters.Counter 타입인 _ownedTokensCount[uint]가 library Counters에 정의된 increment(), decrement(), current()를 호출하기 위해 필요
using Counters for Counters.Counter;
function _mint(address to, uint256 tokenId) internal override {
require(to != address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");
_tokenOwner[tokenId] = to;
_ownedTokensCount[to].increment();
emit Transfer(address(0), to, tokenId);
}
}
contract CharactorByERC721 is Minty_ERC721 {
struct Charactor {
string name; // 캐릭터 이름
uint256 level; // 캐릭터 레벨
}
Charactor[] public charactors; // default: []
address public owner; // 컨트랙트 소유자
constructor () {
owner = msg.sender;
}
modifier isOwner() {
require(owner == msg.sender);
_;
}
// 캐릭터 생성
function mint(string memory name, address account) public isOwner {
uint256 cardId = charactors.length; // 유일한 캐릭터 ID
charactors.push(Charactor(name, 1));
_mint(account, cardId); // ERC721 소유권 등록
}
}