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  1. // Exponentiation operator.
  2.  
  3. import Foundation
  4.  
  5. precedencegroup ExponentiationPrecedence {
  6.     associativity: right
  7.     higherThan: MultiplicationPrecedence
  8. }
  9.  
  10. infix operator ** : ExponentiationPrecedence
  11.  
  12. func ** <T: BinaryFloatingPoint>(_ x: T, _ y: T) -> Double {
  13.     return pow(Double(x), Double(y))
  14. }
  15.  
  16. func ** <T: BinaryInteger>(_ x: T, _ y: T) -> Int {
  17.     return Int(pow(Double(x), Double(y)))
  18. }
  19.  
  20. // Test.
  21.  
  22. func check<T: Equatable>(_ f: () -> Any, _ expect: T) {
  23.     let result = f()
  24.     print(result, terminator: "\t")
  25.     if let x = result as? T {
  26.         if x == expect {
  27.             print("Pass.")
  28.         } else {
  29.             print("Fail:", expect)
  30.         }
  31.     } else {
  32.         let u = type(of: result)
  33.         print("Fail:", u, "not", T.self)
  34.     }
  35. }
  36.  
  37. check({2 ** 0},          1)
  38. check({2 ** Int8(1)},    2)
  39. check({2.0 ** 2},        4.0)
  40. check({2.0 ** Float(3)}, 8.0)
  41. check({2 ** 4.0},        16.0)
  42. check({2.0 ** 5.0},      32.0)
  43. check({2 * 2 ** 4 * 2},  64)
Success #stdin #stdout 0.03s 21092KB
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Standard input is empty
stdout
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1	Pass.
2	Pass.
4.0	Pass.
8.0	Pass.
16.0	Pass.
32.0	Pass.
64	Pass.
https://ideone.com/kCiHRr
language:
Swift (swift 4.2.2)
created:
1 day ago
visibility:
public

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