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Diffstat (limited to 'test/typeswitch1.go')
-rw-r--r-- | test/typeswitch1.go | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/test/typeswitch1.go b/test/typeswitch1.go new file mode 100644 index 0000000..a980ce4 --- /dev/null +++ b/test/typeswitch1.go @@ -0,0 +1,85 @@ +// run + +// Copyright 2009 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. + +// Test simple type switches on basic types. + +package main + +import "fmt" + +const ( + a = iota + b + c + d + e +) + +var x = []int{1, 2, 3} + +func f(x int, len *byte) { + *len = byte(x) +} + +func whatis(x interface{}) string { + switch xx := x.(type) { + default: + return fmt.Sprint("default ", xx) + case int, int8, int16, int32: + return fmt.Sprint("signed ", xx) + case int64: + return fmt.Sprint("signed64 ", int64(xx)) + case uint, uint8, uint16, uint32: + return fmt.Sprint("unsigned ", xx) + case uint64: + return fmt.Sprint("unsigned64 ", uint64(xx)) + case nil: + return fmt.Sprint("nil ", xx) + } + panic("not reached") +} + +func whatis1(x interface{}) string { + xx := x + switch xx.(type) { + default: + return fmt.Sprint("default ", xx) + case int, int8, int16, int32: + return fmt.Sprint("signed ", xx) + case int64: + return fmt.Sprint("signed64 ", xx.(int64)) + case uint, uint8, uint16, uint32: + return fmt.Sprint("unsigned ", xx) + case uint64: + return fmt.Sprint("unsigned64 ", xx.(uint64)) + case nil: + return fmt.Sprint("nil ", xx) + } + panic("not reached") +} + +func check(x interface{}, s string) { + w := whatis(x) + if w != s { + fmt.Println("whatis", x, "=>", w, "!=", s) + panic("fail") + } + + w = whatis1(x) + if w != s { + fmt.Println("whatis1", x, "=>", w, "!=", s) + panic("fail") + } +} + +func main() { + check(1, "signed 1") + check(uint(1), "unsigned 1") + check(int64(1), "signed64 1") + check(uint64(1), "unsigned64 1") + check(1.5, "default 1.5") + check(nil, "nil <nil>") +} |