NFTメモ

pragma solidity >0.5.0 <0.7.0;

/**
import "@openzeppelin/contracts/token/ERC721/ERC721Full.sol";
import "@openzeppelin/contracts/drafts/Counters.sol";
**/
// black "https://ipfs.io/ipfs/xxxxx"
// white "https://ipfs.io/ipfs/xxxxx"

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/ERC721.sol";
//import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/90ed1af972299070f51bf4665a85da56ac4d355e/contracts/utils/Counters.sol";
//import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/90ed1af972299070f51bf4665a85da56ac4d355e/contracts/math/SafeMath.sol";
//import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/90ed1af972299070f51bf4665a85da56ac4d355e/contracts/math/Math.sol";

contract GameItem is ERC721 {
//using Counters for Counters.Counter;
//Counters.Counter private _tokenIds;
uint256 internal nextTokenId = 0;

constructor() ERC721("xxxxxx", "ABC") public {
}

function awardItem(address player, string memory tokenURI) public returns (uint256) {

// function awardItem(address player) public returns (uint256) {
// _tokenIds.increment();

    // uint256 newItemId = _tokenIds.current();
    // uint256 newItemId = uint8(now);
    uint256 newItemId = nextTokenId;
    nextTokenId = nextTokenId.add(1);
    //_mint(player, newItemId);
    _mint(player, newItemId);
    //_setTokenURI(newItemId, "https://ipfs.io/ipfs/xxxxxxxxxxxx");
    _setTokenURI(newItemId, tokenURI);

    return newItemId;
}

}