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Is there formal name for such data structure?

Like Map<Key, Foo>, but with restriction/guarantee that Key is a subset of fields from Foo, actually reference to those fields.

A bit contrived java illustration:

GamePiece { Integer x; Integer y; String gamePieceType; }

HypotheticalStructure<GamePiece> gameMap = new HypotheticalStructure<GamePiece>(GamePiece::getX, GamePiece::getY); // a cell can be occupied only by one piece.

gameMap.add(new GamePiece(1, 1, "Knight")); // ok
gameMap.add(new GamePiece(1, 1, "Rook")); // error - (1, 1 is already occupied by the knight)

(analogous to table where uniqueness constrain on (x,y) exists)

Maybe there is some implementation in some library in some language.

Is there formal name for such data structure?

Like Map<Key, Foo>, but with restriction/guarantee that Key is a subset of fields from Foo, actually reference to those fields.

A bit contrived java illustration:

GamePiece { Integer x; Integer y; String gamePieceType; }

HypotheticalStructure<GamePiece> gameMap = new HypotheticalStructure<GamePiece>(GamePiece::getX, GamePiece::getY); // a cell can be occupied only by one piece.

gameMap.add(new GamePiece(1, 1, "Knight")); // ok
gameMap.add(new GamePiece(1, 1, "Rook")); // error - (1, 1 is already occupied by the knight)

(analogous to table where uniqueness constrain on (x,y) exists)

Maybe there is some implementation in some library in some language.

  • data-structures
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1 Answer 1

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It looks like you're looking for HashSet<E> where E needs to override equals and hashCode. Your uniqueness guarantee depends on your hashCode and equals implementations.

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