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Make Bag(Vec<u8>) field private. Add methods: return_tiles, return_tile, set_from_iter, as_slice, len, is_empty, swap_remove_tile. Replace all external bag.0 accesses across 8 files. No behavior change. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Rewrite Bag as a struct with a front cursor (fc) so tiles can be drawn from either end without allocation. Add went_first field to GameState and reset_and_draw_tiles_double_ended for the new drawing path. Existing reset_and_draw_tiles uses replenish_back only (no behavior change for main_endgame). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Removes the m<=16 assumption. When fc >= 2m, scratch lives in dead space with zero allocation. When fc < 2m, scratch is appended to the vec's back (within existing capacity in practice). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
return_tiles,return_tile,set_from_iter,as_slice,len,is_empty,remove_tile)fc) withtiles[0..fc]as dead space. Optimizedput_backwith special cases for m=1 (1 random call), m=2 (2 random calls, swap doubles as coin flip), and general m>=3 (interleave with early break). Order-preservingremove_tile.put_backusesself.tilesas scratch buffer instead of fixed[0u8; 16], removing the m<=16 assumption. When fc >= 2m, scratch lives in dead space (zero allocation). Otherwise, scratch is appended to the vec's back.Why
Prepares infrastructure for game pairs (playing each seed twice with different initial players).
Notes
main_endgame.rsunchanged — still usesreset_and_draw_tiles(back-only)reset_and_draw_tiles_double_endedunsafeexcept in the general (m>=3)put_backloop, with safety proof in comments🤖 Generated with Claude Code
Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com