Invercargill/src/lib/Queries/Transform.vala

namespace Invercargill {

    private class TransformQuery<Tin, Tout> : BaseQuery<Tin, Tout> {
        private TransformDelegate<Tin, Tout> transform_func;

        public TransformQuery(Enumerable<Tin> input, TransformDelegate<Tin, Tout> transform) {
            this.input = input;
            transform_func = x => transform(x);
        }

        public override bool iterate_if (Invercargill.PredicateDelegate<Tout> handler) {
            return input.iterate_if(i => handler(transform_func(i)));
        }
    }

}