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mdx(\"svg\", {\n    parentName: \"a\",\n    \"aria-hidden\": \"true\",\n    \"focusable\": \"false\",\n    \"height\": \"16\",\n    \"version\": \"1.1\",\n    \"viewBox\": \"0 0 16 16\",\n    \"width\": \"16\"\n  }, mdx(\"path\", {\n    parentName: \"svg\",\n    \"fillRule\": \"evenodd\",\n    \"d\": \"M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z\"\n  }))), \"Description:\"), mdx(\"p\", null, \"The \", mdx(\"inlineCode\", {\n    parentName: \"p\"\n  }, \"_updateRewardCheckpoint\"), \" function assigns the existing \", mdx(\"inlineCode\", {\n    parentName: \"p\"\n  }, \"rewardPerToken\"), \" to a user should they have a zero balance, meaning that the checkpointing system can be circumvented to take advantage of a huge delta between \", mdx(\"inlineCode\", {\n    parentName: \"p\"\n  }, \"newRewardPerToken\"), \" and \", mdx(\"inlineCode\", {\n    parentName: \"p\"\n  }, \"cp.rewardPerToken\"), \" on new accounts, acquiring a disproportionate reward.\"), mdx(\"h3\", {\n    \"id\": \"example\",\n    \"style\": {\n      \"position\": \"relative\"\n    }\n  }, mdx(\"a\", {\n    parentName: \"h3\",\n    \"href\": \"#example\",\n    \"aria-label\": \"example permalink\",\n    \"className\": \"anchor before\"\n  }, mdx(\"svg\", {\n    parentName: \"a\",\n    \"aria-hidden\": \"true\",\n    \"focusable\": \"false\",\n    \"height\": \"16\",\n    \"version\": \"1.1\",\n    \"viewBox\": \"0 0 16 16\",\n    \"width\": \"16\"\n  }, mdx(\"path\", {\n    parentName: \"svg\",\n    \"fillRule\": \"evenodd\",\n    \"d\": \"M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z\"\n  }))), \"Example:\"), mdx(\"pre\", null, mdx(\"code\", {\n    parentName: \"pre\",\n    \"className\": \"language-sol\",\n    \"metastring\": \"title=contracts/tokens/RewardEthToken.sol highlight={15} lineNumbers=true lineOffset=158\",\n    \"title\": \"contracts/tokens/RewardEthToken.sol\",\n    \"highlight\": \"{15}\",\n    \"lineNumbers\": \"true\",\n    \"lineOffset\": \"158\"\n  }, \"function _updateRewardCheckpoint(address account, uint128 newRewardPerToken) internal {\\n    Checkpoint memory cp = checkpoints[account];\\n    if (newRewardPerToken == cp.rewardPerToken) return;\\n\\n    uint256 stakedEthAmount;\\n    if (account == address(0)) {\\n        // fetch merkle distributor current principal\\n        stakedEthAmount = stakedEthToken.distributorPrincipal();\\n    } else {\\n        stakedEthAmount = stakedEthToken.balanceOf(account);\\n    }\\n    if (stakedEthAmount == 0) {\\n        checkpoints[account] = Checkpoint({\\n            reward: cp.reward,\\n            rewardPerToken: cp.rewardPerToken\\n        });\\n    } else {\\n        uint256 periodRewardPerToken = uint256(newRewardPerToken).sub(cp.rewardPerToken);\\n        checkpoints[account] = Checkpoint({\\n            reward: _calculateNewReward(cp.reward, stakedEthAmount, periodRewardPerToken).toUint128(),\\n            rewardPerToken: newRewardPerToken\\n        });\\n    }\\n}\\n\")), mdx(\"h3\", {\n    \"id\": \"recommendation\",\n    \"style\": {\n      \"position\": \"relative\"\n    }\n  }, mdx(\"a\", {\n    parentName: \"h3\",\n    \"href\": \"#recommendation\",\n    \"aria-label\": \"recommendation permalink\",\n    \"className\": \"anchor before\"\n  }, mdx(\"svg\", {\n    parentName: \"a\",\n    \"aria-hidden\": \"true\",\n    \"focusable\": \"false\",\n    \"height\": \"16\",\n    \"version\": \"1.1\",\n    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