什麼是 pid 或 _pid？

我在很多契約中都看到了這一點，但我不確定它的用途。

例子

/**
*Submitted for verification at FtmScan.com on 2022-04-01
*/

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.0 <0.9.0;

interface IERC20 {
   function deposit() external payable;
   function balanceOf(address account) external view returns (uint256);
   function transfer(address recipient, uint256 amount) external returns (bool);
   function approve(address spender, uint256 amount) external returns (bool);
   function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
   function decimals() external view returns (uint8);
   function withdraw (uint256 amount) external returns (uint256);
}

interface ITombSwap {
   function pendingShare(uint256 _pid, address _user) external view returns (uint256);
   function poolInfo (uint256) external view returns (address token, uint256 allocPoint, uint256 lastRewardTime, uint256 accTSharePerShare, bool isStarted);

}

contract tombSwapOracle {
   address public rewardPool = 0xcc0a87F7e7c693042a9Cc703661F5060c80ACb43;
   address public tshare = 0x4cdF39285D7Ca8eB3f090fDA0C069ba5F4145B37;
   address public wftm = 0x21be370D5312f44cB42ce377BC9b8a0cEF1A4C83;
   address public lp = 0x4733bc45eF91cF7CcEcaeeDb794727075fB209F2;

   function getTsharePrice() public view returns(uint256){
       return IERC20(wftm).balanceOf(lp)*1e18/IERC20(tshare).balanceOf(lp);
   }

   function getReward(uint256 _pid, address _user) public view returns(uint256){
       return ITombSwap(rewardPool).pendingShare(_pid,_user)*getTsharePrice()/1e18;
   }
   
   function getPoolInfo(uint256 _pid) public view returns(address token, uint256 allocPoint, uint256 lastRewardTime, uint256 accTSharePerShare, bool isStarted){
       return ITombSwap(rewardPool).poolInfo(_pid);
   }
}

Pid 是池 id 的首字母縮寫詞。

引用自：https://ethereum.stackexchange.com/questions/125250