39 lines
1.6 KiB
Solidity
39 lines
1.6 KiB
Solidity
// SPDX-License-Identifier: GPL-3.0-or-later
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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pragma solidity >=0.7.0 <0.9.0;
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pragma experimental ABIEncoderV2;
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import "./IBasePool.sol";
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/**
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* @dev IPools with the General specialization setting should implement this interface.
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*
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* This is called by the Vault when a user calls `IVault.swap` or `IVault.batchSwap` to swap with this Pool.
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* Returns the number of tokens the Pool will grant to the user in a 'given in' swap, or that the user will
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* grant to the pool in a 'given out' swap.
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*
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* This can often be implemented by a `view` function, since many pricing algorithms don't need to track state
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* changes in swaps. However, contracts implementing this in non-view functions should check that the caller is
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* indeed the Vault.
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*/
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interface IGeneralPool is IBasePool {
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function onSwap(
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SwapRequest memory swapRequest,
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uint256[] memory balances,
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uint256 indexIn,
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uint256 indexOut
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) external returns (uint256 amount);
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}
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