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Based on EIP-2535: Diamonds (https://eips.ethereum.org/EIPS/eip-2535) Follows diamond-3 implementation (https://github.com/mudgen/diamond-3-hardhat/) One of the diamond standard interfaces, used to inspect the diamond like a magnifying glass.

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Facet

These functions are expected to be called frequently by tools. 
struct Facet {
  address facetAddress;
  bytes4[] functionSelectors;
}

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facets

function facets() external view returns (struct IGNSDiamondLoupe.Facet[] facets_)
Gets all facet addresses and their four byte function selectors.

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Return Values

NameTypeDescription
facets_IGNSDiamondLoupe.Facet[]Facet

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facetFunctionSelectors

function facetFunctionSelectors(address _facet) external view returns (bytes4[] facetFunctionSelectors_)
Gets all the function selectors supported by a specific facet.

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Parameters

NameTypeDescription
_facetaddressThe facet address.

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Return Values

NameTypeDescription
facetFunctionSelectors_bytes4[]

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facetAddresses

function facetAddresses() external view returns (address[] facetAddresses_)
Get all the facet addresses used by a diamond.

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Return Values

NameTypeDescription
facetAddresses_address[]

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facetAddress

function facetAddress(bytes4 _functionSelector) external view returns (address facetAddress_)
Gets the facet that supports the given selector. If facet is not found return address(0).

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Parameters

NameTypeDescription
_functionSelectorbytes4The function selector.

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Return Values

NameTypeDescription
facetAddress_addressThe facet address.