39f5a0284e
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com> Co-authored-by: Ernesto García <ernestognw@gmail.com>
36 lines
1.2 KiB
Solidity
36 lines
1.2 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v5.3.0-rc.0) (token/ERC6909/extensions/draft-ERC6909TokenSupply.sol)
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pragma solidity ^0.8.20;
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import {ERC6909} from "../draft-ERC6909.sol";
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import {IERC6909TokenSupply} from "../../../interfaces/draft-IERC6909.sol";
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/**
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* @dev Implementation of the Token Supply extension defined in ERC6909.
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* Tracks the total supply of each token id individually.
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*/
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contract ERC6909TokenSupply is ERC6909, IERC6909TokenSupply {
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mapping(uint256 id => uint256) private _totalSupplies;
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/// @inheritdoc IERC6909TokenSupply
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function totalSupply(uint256 id) public view virtual override returns (uint256) {
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return _totalSupplies[id];
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}
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/// @dev Override the `_update` function to update the total supply of each token id as necessary.
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function _update(address from, address to, uint256 id, uint256 amount) internal virtual override {
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super._update(from, to, id, amount);
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if (from == address(0)) {
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_totalSupplies[id] += amount;
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}
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if (to == address(0)) {
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unchecked {
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// amount <= _balances[from][id] <= _totalSupplies[id]
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_totalSupplies[id] -= amount;
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}
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}
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}
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}
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