mirror of
https://github.com/golang/go
synced 2024-11-14 08:00:22 -07:00
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>
133 lines
2.6 KiB
Go
133 lines
2.6 KiB
Go
// Copyright 2012 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.
|
|
|
|
// This file contains the code snippets included in "The Laws of Reflection."
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
)
|
|
|
|
func main() {
|
|
var x float64 = 3.4
|
|
fmt.Println("type:", reflect.TypeOf(x))
|
|
// STOP OMIT
|
|
// TODO(proppy): test output OMIT
|
|
}
|
|
|
|
// STOP main OMIT
|
|
|
|
func f1() {
|
|
// START f1 OMIT
|
|
var x float64 = 3.4
|
|
v := reflect.ValueOf(x)
|
|
fmt.Println("type:", v.Type())
|
|
fmt.Println("kind is float64:", v.Kind() == reflect.Float64)
|
|
fmt.Println("value:", v.Float())
|
|
// STOP OMIT
|
|
}
|
|
|
|
func f2() {
|
|
// START f2 OMIT
|
|
var x uint8 = 'x'
|
|
v := reflect.ValueOf(x)
|
|
fmt.Println("type:", v.Type()) // uint8.
|
|
fmt.Println("kind is uint8: ", v.Kind() == reflect.Uint8) // true.
|
|
x = uint8(v.Uint()) // v.Uint returns a uint64.
|
|
// STOP OMIT
|
|
}
|
|
|
|
func f3() {
|
|
// START f3 OMIT
|
|
type MyInt int
|
|
var x MyInt = 7
|
|
v := reflect.ValueOf(x)
|
|
// STOP OMIT
|
|
// START f3b OMIT
|
|
y := v.Interface().(float64) // y will have type float64.
|
|
fmt.Println(y)
|
|
// STOP OMIT
|
|
// START f3c OMIT
|
|
fmt.Println(v.Interface())
|
|
// STOP OMIT
|
|
// START f3d OMIT
|
|
fmt.Printf("value is %7.1e\n", v.Interface())
|
|
// STOP OMIT
|
|
}
|
|
|
|
func f4() {
|
|
// START f4 OMIT
|
|
var x float64 = 3.4
|
|
v := reflect.ValueOf(x)
|
|
v.SetFloat(7.1) // Error: will panic.
|
|
// STOP OMIT
|
|
}
|
|
|
|
func f5() {
|
|
// START f5 OMIT
|
|
var x float64 = 3.4
|
|
v := reflect.ValueOf(x)
|
|
fmt.Println("settability of v:", v.CanSet())
|
|
// STOP OMIT
|
|
}
|
|
|
|
func f6() {
|
|
// START f6 OMIT
|
|
var x float64 = 3.4
|
|
v := reflect.ValueOf(x)
|
|
// STOP OMIT
|
|
// START f6b OMIT
|
|
v.SetFloat(7.1)
|
|
// STOP OMIT
|
|
}
|
|
|
|
func f7() {
|
|
// START f7 OMIT
|
|
var x float64 = 3.4
|
|
p := reflect.ValueOf(&x) // Note: take the address of x.
|
|
fmt.Println("type of p:", p.Type())
|
|
fmt.Println("settability of p:", p.CanSet())
|
|
// STOP OMIT
|
|
// START f7b OMIT
|
|
v := p.Elem()
|
|
fmt.Println("settability of v:", v.CanSet())
|
|
// STOP OMIT
|
|
// START f7c OMIT
|
|
v.SetFloat(7.1)
|
|
fmt.Println(v.Interface())
|
|
fmt.Println(x)
|
|
// STOP OMIT
|
|
}
|
|
|
|
func f8() {
|
|
// START f8 OMIT
|
|
type T struct {
|
|
A int
|
|
B string
|
|
}
|
|
t := T{23, "skidoo"}
|
|
s := reflect.ValueOf(&t).Elem()
|
|
typeOfT := s.Type()
|
|
for i := 0; i < s.NumField(); i++ {
|
|
f := s.Field(i)
|
|
fmt.Printf("%d: %s %s = %v\n", i,
|
|
typeOfT.Field(i).Name, f.Type(), f.Interface())
|
|
}
|
|
// STOP OMIT
|
|
// START f8b OMIT
|
|
s.Field(0).SetInt(77)
|
|
s.Field(1).SetString("Sunset Strip")
|
|
fmt.Println("t is now", t)
|
|
// STOP OMIT
|
|
}
|
|
|
|
func f9() {
|
|
// START f9 OMIT
|
|
var x float64 = 3.4
|
|
fmt.Println("value:", reflect.ValueOf(x))
|
|
// STOP OMIT
|
|
}
|