diff options
Diffstat (limited to 'test/typeparam/fact.go')
-rw-r--r-- | test/typeparam/fact.go | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/test/typeparam/fact.go b/test/typeparam/fact.go new file mode 100644 index 0000000..3c9a13a --- /dev/null +++ b/test/typeparam/fact.go @@ -0,0 +1,32 @@ +// run + +// Copyright 2021 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package main + +import "fmt" + +func fact[T interface{ ~int | ~int64 | ~float64 }](n T) T { + if n == 1 { + return 1 + } + return n * fact(n-1) +} + +func main() { + const want = 120 + + if got := fact(5); got != want { + panic(fmt.Sprintf("got %d, want %d", got, want)) + } + + if got := fact[int64](5); got != want { + panic(fmt.Sprintf("got %d, want %d", got, want)) + } + + if got := fact(5.0); got != want { + panic(fmt.Sprintf("got %f, want %f", got, want)) + } +} |