{
    "Function": "removeFunction",
    "File": "src/Libraries/LibDiamond.sol",
    "Parent Contracts": [],
    "High-Level Calls": [],
    "Internal Calls": [
        "require(bool,string)",
        "require(bool,string)"
    ],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function removeFunction(\n        DiamondStorage storage ds,\n        address _facetAddress,\n        bytes4 _selector\n    ) internal {\n        require(_facetAddress != address(0), \"LibDiamondCut: Can't remove function that doesn't exist\");\n        // an immutable function is a function defined directly in a diamond\n        require(_facetAddress != address(this), \"LibDiamondCut: Can't remove immutable function\");\n        // replace selector with last selector, then delete last selector\n        uint256 selectorPosition = ds.selectorToFacetAndPosition[_selector].functionSelectorPosition;\n        uint256 lastSelectorPosition = ds.facetFunctionSelectors[_facetAddress].functionSelectors.length - 1;\n        // if not the same then replace _selector with lastSelector\n        if (selectorPosition != lastSelectorPosition) {\n            bytes4 lastSelector = ds.facetFunctionSelectors[_facetAddress].functionSelectors[lastSelectorPosition];\n            ds.facetFunctionSelectors[_facetAddress].functionSelectors[selectorPosition] = lastSelector;\n            ds.selectorToFacetAndPosition[lastSelector].functionSelectorPosition = uint96(selectorPosition);\n        }\n        // delete the last selector\n        ds.facetFunctionSelectors[_facetAddress].functionSelectors.pop();\n        delete ds.selectorToFacetAndPosition[_selector];\n\n        // if no more selectors for facet address then delete the facet address\n        if (lastSelectorPosition == 0) {\n            // replace facet address with last facet address and delete last facet address\n            uint256 lastFacetAddressPosition = ds.facetAddresses.length - 1;\n            uint256 facetAddressPosition = ds.facetFunctionSelectors[_facetAddress].facetAddressPosition;\n            if (facetAddressPosition != lastFacetAddressPosition) {\n                address lastFacetAddress = ds.facetAddresses[lastFacetAddressPosition];\n                ds.facetAddresses[facetAddressPosition] = lastFacetAddress;\n                ds.facetFunctionSelectors[lastFacetAddress].facetAddressPosition = facetAddressPosition;\n            }\n            ds.facetAddresses.pop();\n            delete ds.facetFunctionSelectors[_facetAddress].facetAddressPosition;\n        }\n    }"
}