40 lines
824 B
TypeScript
40 lines
824 B
TypeScript
// @declaration: true
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class Box<P> {
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value: P;
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}
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type Boxified<T> = {
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[K in keyof T]: Box<T[K]>;
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}
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declare function boxify<T>(obj: T): Boxified<T>;
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declare function unboxify<T>(obj: Boxified<T>): T;
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interface Bacon {
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isPerfect: boolean;
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weight: number;
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}
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interface BoxifiedBacon {
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isPerfect: Box<boolean>;
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weight: Box<number>;
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}
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function f1(b: Bacon) {
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let bb = boxify(b);
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let isPerfect = bb.isPerfect.value;
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let weight = bb.weight.value;
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}
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function f2(bb: Boxified<Bacon>) {
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let b = unboxify(bb); // Infer Bacon for T
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let bool = b.isPerfect;
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let weight = b.weight;
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}
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function f3(bb: BoxifiedBacon) {
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let b = unboxify<Bacon>(bb); // Explicit type parameter required
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let bool = b.isPerfect;
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let weight = bb.weight;
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} |