84 lines
2.3 KiB
TypeScript
84 lines
2.3 KiB
TypeScript
//// [genericCallWithObjectTypeArgsAndConstraints3.ts]
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// Generic call with constraints infering type parameter from object member properties
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class Base {
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x: string;
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}
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class Derived extends Base {
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y: string;
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}
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class Derived2 extends Base {
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z: string;
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}
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function f<T extends Base>(a: { x: T; y: T }) {
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var r: T;
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return r;
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}
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var r1 = f({ x: new Derived(), y: new Derived2() }); // error because neither is supertype of the other
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function f2<T extends Base, U extends { x: T; y: T }>(a: U) {
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var r: T;
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return r;
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}
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var r2 = f2({ x: new Derived(), y: new Derived2() }); // ok
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var r3 = f2({ x: new Derived(), y: new Derived2() }); // ok
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function f3<T extends Base>(y: (a: T) => T, x: T) {
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return y(null);
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}
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// all ok - second argument is processed before x is fixed
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var r4 = f3(x => x, new Base());
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var r5 = f3(x => x, new Derived());
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var r6 = f3(x => x, null);
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//// [genericCallWithObjectTypeArgsAndConstraints3.js]
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// Generic call with constraints infering type parameter from object member properties
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var __extends = (this && this.__extends) || function (d, b) {
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for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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var Base = (function () {
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function Base() {
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}
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return Base;
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})();
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var Derived = (function (_super) {
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__extends(Derived, _super);
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function Derived() {
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_super.apply(this, arguments);
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}
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return Derived;
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})(Base);
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var Derived2 = (function (_super) {
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__extends(Derived2, _super);
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function Derived2() {
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_super.apply(this, arguments);
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}
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return Derived2;
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})(Base);
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function f(a) {
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var r;
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return r;
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}
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var r1 = f({ x: new Derived(), y: new Derived2() }); // error because neither is supertype of the other
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function f2(a) {
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var r;
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return r;
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}
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var r2 = f2({ x: new Derived(), y: new Derived2() }); // ok
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var r3 = f2({ x: new Derived(), y: new Derived2() }); // ok
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function f3(y, x) {
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return y(null);
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}
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// all ok - second argument is processed before x is fixed
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var r4 = f3(function (x) { return x; }, new Base());
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var r5 = f3(function (x) { return x; }, new Derived());
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var r6 = f3(function (x) { return x; }, null);
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