ResourceField.viewed: def of bendvy-ecs-core@0.1.0.3
Import: import bendvy-ecs-core@0.1.0.3/resource_field.bend as ResourceField
Lines 4-7 of bendvy-ecs-core@0.1.0.3/resource_field.bend: https://jend.leeeet.dev/read.txt?path=bendvy-ecs-core@0.1.0.3/resource_field.bend&start_line=4&end_line=7

import Base
import bendvy-ecs-core@0.1.0.3/owner_product.bend as Product

# Canonical product lenses preserve affine siblings during selected-field operations.
def viewed(~R:Type,~P:Type,~Rest:Type,~V:Data,~lens:Product.Lens<R,P,Rest>,rest:Rest,result:P & V) -> R & V:
  match result:
    case (part,value):(Product.put_field(~R,~P,~Rest,lens)(rest,part),value)

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.3/owner_product.bend&name=Lens
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.3/owner_product.bend&name=put_field