Orkuncakilkaya
ab0b84b87e
An action names one row of a ludic.base Table<T> by its handle, in a field marked @Target, and `reducer Deer in Herd.deer on Spook(r: mut Row<Deer>, n: Noise, a: Spook)` runs once, for that row alone (the table may sit down a path, S.w.tab). The drain resolves the handle (tb_row) and hands the reducer a Row<T> - new in ludic.base: tb, row, h, rec - that the queue keeps, one per row reducer, filled in place, so a targeted action allocates nothing; a stale handle runs nothing, and LUDIC_ACTIONS_LOG=1 prints a line for it (@alloc_ok). Row reducers order among an action's by their state's name, then the table's path. Checked at compile time (actions_rows.ludic): the row reaches r.rec and r.h only - r.tb / r.row refused, the view never assigned, stored, copied or handed on except to a @RowVerb (a function of the record's own module taking Row<T> first; any other function taking a row is refused); a field marked @Column (a table column mirrors it) is not written through r.rec; only the module owning the state declares a row reducer; one @Target, an int, per action; the states between the row and the action are read. `mut` is allowed on a Row<T> parameter. ludic schema's code section gains row_reducers (record, table, state, action, target, predicted, net, module, at) and row_verbs (name, record, module, at), and every action its target; row reducers are left out of `reducers`. ludic deps and ludic-lsp name a row reducer `reducer Deer in Herd.deer on Spook`. vocab: @Target, @Column, @RowVerb; docs/language pages; LANGUAGE.md "A reducer on a row"; examples actions/rows and ten rejects; test.ludic feat, reject and schema cases (not run); changes/row-reducers.md. Reseeded; bootstrap-cfree fixpoint holds (307497 lines); Maroon Lake's `ludic build --check` is clean against this tree. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
16 lines
628 B
Markdown
16 lines
628 B
Markdown
---
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id: annot-target
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name: @Target
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category: annotations
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kind: annotation
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tokens: @Target
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sig: action Spook { @Target who: int = -1 }
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tip: An action's field holding the handle of the one table row it names.
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order: 81
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---
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<code>@Target</code> marks the field of an <code>action</code> that holds a row's handle - what <code>tb_add</code> returned. A row reducer (<code>reducer Deer in Herd.deer on Spook</code>) runs once, for that row alone, and a handle whose row is gone runs nothing. An action has one: several rows are one <code>dispatch</code> per handle.
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```ludic
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action Spook { @Target who: int = -1, by: int = 1 }
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```
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