File: contextualSignatureInstatiationContravariance.ts

package info (click to toggle)
node-typescript 2.1.5-1~bpo8%2B1
  • links: PTS, VCS
  • area: main
  • in suites: jessie-backports
  • size: 203,960 kB
  • sloc: sh: 11; makefile: 5
file content (11 lines) | stat: -rw-r--r-- 441 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
 
interface Animal { x }
interface Giraffe extends Animal { y }
interface Elephant extends Animal { y2 }

var f2: <T extends Animal>(x: T, y: T) => void;

var g2: (g: Giraffe, e: Elephant) => void;
g2 = f2; // valid because both Giraffe and Elephant satisfy the constraint. T is Animal

var h2: (g1: Giraffe, g2: Giraffe) => void;
h2 = f2; // valid because Giraffe satisfies the constraint. It is safe in the traditional contravariant fashion.