tl;dr You can perform a type assertion only on interface values. So you must convert x to a valid interface type first, any / interface{} in this case: func isInt[T any](x T) (ok bool) { _, ok = any(x).(int) // convert, then assert return } So why does this fail to compile? _, ok = … Read more
It’s good practice to keep the mutex close to the data it is destined to protect. If a mutex ought to protect concurrent access to fields of a struct value, it’s very convenient to add the mutex as a field of that struct, so its purpose is obvious. If in your app there is only … Read more
The following command should do it: # strings binary_path | grep ‘go1\.’ go1.5.3
There is no explicit documentation of function parameters in godoc. Any necessary details not covered by the name and type of the parameter should go into the doc comment for the function. For examples, see every function in the standard library.
Resolving ~ (denoting the user home) is a different story, and usually it’s the shell that resolves this. For details see Expand tilde to home directory. If you want to do it from Go code, you may use the user.Current() function to get details about the current user, including its home folder which will be … Read more
You can’t. You can only pass a value, and CustomStruct is not a value but a type. Using a type identifier is a compile-time error. Usually when a “type” is to be passed, you pass a reflect.Type value which describes the type. This is what you “create” inside your getTypeName(), but then the getTypeName() will … Read more
Here’s a pretty direct translation, but the “choosing which if multiple are ready” part works differently – it’s just taking what came in first. Also this is like running your code with gomaxprocs(1). import threading import Queue def main(): c1 = Queue.Queue(maxsize=0) c2 = Queue.Queue(maxsize=0) quit = Queue.Queue(maxsize=0) def func1(): for i in range(10): c1.put(i) … Read more
Internal packages (packages that are inside a folder that has an internal folder in their path) can only be imported from packages rooted at the parent of the internal folder. E.g. a package pkg/foo/internal/bar can be imported by the package pkg/foo/internal/baz and also from pkg/foo/baz, but cannot be imported by the package pkg nor can … Read more
To build from Linux to Windows, you need to set the environment variables GOOS to Windows and GOARCH to amd64. On Bash or ZSH: % GOOS=windows GOARCH=amd64 go build For more details see: https://dave.cheney.net/2015/08/22/cross-compilation-with-go-1-5 A description of possible values for GOOS and GOARCH is available here: https://golang.org/doc/install/source#environment If your package requires CGO then you need … Read more
ioutil.ReadAll -> io.ReadAll ioutil.ReadFile -> os.ReadFile ioutil.ReadDir -> os.ReadDir // others ioutil.NopCloser -> io.NopCloser ioutil.TempDir -> os.MkdirTemp ioutil.TempFile -> os.CreateTemp ioutil.WriteFile -> os.WriteFile