README.md

Vet

Vet examines Go source code and reports suspicious constructs, such as Printf calls whose arguments do not align with the format string. Vet uses heuristics that do not guarantee all reports are genuine problems, but it can find errors not caught by the compilers. https://pkg.go.dev/cmd/vet

go vet my/project/...

範例

package main

import "fmt"

type nocopy struct{}

func (*nocopy) Lock()   {}
func (*nocopy) Unlock() {}

type TestVet struct {
	nocopy
}

func (t *TestVet) Hello() {
	fmt.Println("Hello")
}

func main() {
	m := TestVet{}
	c := m
	c.Hello()
}

這段code直接執行是沒有問題的，但是使用go vet檢查後會發現以下問題

main.go:20:7: assignment copies lock value to c: command-line-arguments.TestVet

vet其中一項檢查是:

• copylocks : check for locks erroneously passed by value

當我們不想讓struct被copy時,可以嵌套nocopy struct, 這樣就可以被vet檢查出來