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https://github.com/golang/go
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5451fff475
The tests in doc/progs appear to have been originally written for use with the old test driver. At some later point, they acquired their own test driver. Both ran tests in serial. This CL rewrites the current test driver in Go, runs tests concurrently, and cleans up historical artifacts from the old drivers. The primary motivation is to speed up all.bash. On my laptop, using tip, this CL reduces doc/progs test wall time from 26s to 7s. The savings will remain even when the compiler gets faster. Using Go 1.4, this CL reduces test wall time from 15s to 4s. Change-Id: Iae945a8490222beee76e8a2118a0d7956092f543 Reviewed-on: https://go-review.googlesource.com/8410 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
43 lines
696 B
Go
43 lines
696 B
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"math"
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)
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func InterfaceExample() {
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var i interface{}
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i = "a string"
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i = 2011
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i = 2.777
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// STOP OMIT
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r := i.(float64)
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fmt.Println("the circle's area", math.Pi*r*r)
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// STOP OMIT
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switch v := i.(type) {
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case int:
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fmt.Println("twice i is", v*2)
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case float64:
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fmt.Println("the reciprocal of i is", 1/v)
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case string:
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h := len(v) / 2
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fmt.Println("i swapped by halves is", v[h:]+v[:h])
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default:
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// i isn't one of the types above
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}
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// STOP OMIT
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}
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func main() {
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InterfaceExample()
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}
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