class

Collections::DenseGrid(T)

Inherits Enumerable < Reference < Object

A dense, fixed-size 2D grid backed by a flat buffer.

Where Grid is about traversal (neighbours, flood fill, shortest paths), DenseGrid is a mutable numeric canvas: O(1) cell access, rectangle updates, and whole-grid reductions. The right tool for "apply operations to regions, then tally the cells" puzzles.

Follows the same (row, col) convention as Grid. Includes Enumerable(T), so sum, count, min/max, tally, etc. are all available.

Constructors

new(rows : Int32, cols : Int32, fill : T)

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Instance methods

[](row : Int32, col : Int32) : T

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[]=(row : Int32, col : Int32, value : T) : T

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cols

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each

Must yield this collection's elements to the block.

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each_with_coords

Yield every cell together with its coordinates, in row-major order.

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fill_rect(row1 : Int32, col1 : Int32, row2 : Int32, col2 : Int32, value : T) : Nil

Set every cell in the inclusive rectangle to value.

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rows

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update_rect(row1 : Int32, col1 : Int32, row2 : Int32, col2 : Int32, & : T -> T) : Nil

Apply block to every cell in the inclusive rectangle, replacing each with the block's return value. Corners may be given in any order.

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