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```solidity
contract MyNFT is ERC721 {
uint256 private _tokenIds;
constructor()
ERC721("MyNFT", "MNFT")
{ }
function mint(address to)
public returns (uint256)
{
_tokenIds++;
_mint(to, _tokenIds);
return _tokenIds;
}
}
```
|
```typescript
// OP721 base class already manages _nextTokenId internally
@final
export class MyNFT extends OP721 {
public constructor() {
super();
}
public override onDeployment(_: Calldata): void {
// Base class sets _nextTokenId to 1 automatically
this.instantiate(new OP721InitParameters(
'MyNFT', // name
'MNFT', // symbol
'https://example.com/nft/', // baseURI
u256.fromU64(10000) // maxSupply
));
}
@method({ name: 'to', type: ABIDataTypes.ADDRESS })
@returns({ name: 'tokenId', type: ABIDataTypes.UINT256 })
@emit('Transferred')
public mint(calldata: Calldata): BytesWriter {
const to = calldata.readAddress();
// Use base class _nextTokenId
const tokenId = this._nextTokenId.value;
this._mint(to, tokenId);
this._nextTokenId.value = SafeMath.add(tokenId, u256.One);
const writer = new BytesWriter(32);
writer.writeU256(tokenId);
return writer;
}
}
```
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