cannot call pointer method on m["x"] cannot take the address of m["x"] 52. 更新 map 字段的值 如果map一个字段的值是 struct 类型,则无法直接更新该 struct 的单个字段: // 无法直接更新 struct 的字段值 type data struct { name string } func
ValueMethod() f2 := &Foo{name: "pointer struct"} f2.PointerMethod() f2.ValueMethod() // 编译器会自动解引用,变为 (*f2).PointerMethod() NewFoo().ValueMethod() NewFoo().PointerMethod() // Error!!! } 最后一句报错如下: ./pointer_method.go:34:10: cannot call pointer method on N...
/tmp/sandbox017696142/main.go:25: cannot call pointer method on m["x"]/tmp/sandbox017696142/main.go:25: cannot take the address of m["x"] 更新Map的值 如果你有一个struct值的map,你无法更新单个的struct值。 Fails: 1 2 3 4 5 6 7 8 9 10 package main type data struct { name ...
Golang cannot take the address of 今天在使用kubernetes/apimachinery下/pkg/api/resource中的Quantity接收k8s资源信息的时候,报出如下错误: ..\server\handlers\adapter.go:70: cannot call pointer method on clusterQuota.Hard[admin.ResourceRequestsCPU] ..\server\handlers\adapter.go:70: cannot take the add...
./pointer_method.go:34:10:cannot call pointer method onNewFoo()./pointer_method.go:34:10:cannot take the addressofNewFoo() 看来编译器首先试着给NewFoo()返回的右值调用 pointer method,出错;然后试图给其插入取地址符,未果,就只能报错了。
panic: runtime error: invalid memory address or nil pointer dereference 应该先检查 HTTP 响应错误为nil,再调用resp.Body.Close()来关闭响应体: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 1// 大多数情况正确的示例2funcmain(){3resp,err:=http.Get("https://api.ipify.org?format=json")4che...
./pointer_method.go:34:10: cannot call pointer method on NewFoo() ./pointer_method.go:34:10: cannot take the address of NewFoo() 1. 2. 看来编译器首先试着给 NewFoo() 返回的右值调用 pointer method,出错;然后试图给其插入取地址符,未果,就只能报错了。
= reflectlite.Ptr || val.IsNil() {panic("errors: target must be a non-nil pointer")}targetType := typ.Elem()iftargetType.Kind() != reflectlite.Interface && !targetType.Implements(errorType) {panic("errors: *target must be interface or implement error")}forerr !=nil{ifreflectlite.TypeOf...
// The compiler inserts a call to this at the end of any // function which calls defer. func deferreturn() 看到deferreturn函数的注释,基本也就明白了Go语言如何保证在函数返回时执行当前函数内声明的defer。在编译阶段,如果检测到当前函数声明了defer,则会在函数末尾添加deferreturn函数调用,该函数...
type Cat struct{} func (c *Cat) Walk() { fmt.Println("catwalk") } func (c *Cat) Quack() { fmt.Println("meow") } func main() { Cat{}.Walk() Cat{}.Quack() (&Cat{}).Walk() (&Cat{}).Quack() } ./test.go:20:7: cannot call pointer method on Cat literal ./test.go...