...ng URI for each
* token will be the concatenation of the `baseURI` and the `tokenId`.
*/
string _baseTokenURI;
// _price is the price of one Crypto Dev NFT
uint256 public _price = 0.01 ether;
// _paused is used to pause the contract in case of an emer...
...息由房东发布，包含租金押金等信息：
```rust
//If the landlord wants to rent out a house, they first need to issue a rental notice
struct RentalNotice has key,store {
// uid of the RentalNotice object
id: UID,
// the amount of gas to be paid per month
monthly...
...his method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
```
从`isContract`...