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QUESTION
I'm learning Go 1.18 generics and I'm trying to understand why I'm having trouble here. Long story short, I'm trying to Unmarshal
a protobuf and I want the parameter type in blah
to "just work". I've simplified the problem as best I could, and this particular code is reproducing the same error message I'm seeing:
ANSWER
Answered 2022-Apr-08 at 07:10https://golang.google.cn/blog/intro-generics
Until recently, the Go spec said that an interface defines a method set, which is roughly the set of methods enumerated in the interface. Any type that implements all those methods implements that interface.
QUESTION
I am trying to implement an interface 'abstractly'. What I mean by that is that I am trying to implement the method(s) of that interface in terms of methods of another interface.
Here's what I tried (but it doesn't work because it seems we are not allowed to use a Interface type as a receiver):
...ANSWER
Answered 2022-Apr-04 at 01:33You cannot have a structure similar to an abstract base class that calls the methods of the concrete implementation. There are ways to emulate that, but I am guessing that's not what you are asking.
In Go, an interface is simply a method list, and the concept of class inheritance does not exist. You can build object hierarchies using type embedding, but that does not provide the late binding you need to implement this.
However, you can do this:
Create a stringer function for symbols:
QUESTION
I'm trying to compile kaniko on a raspberry pi.
I don't program in golang, but I was able to compile kaniko successfully a few weeks ago on the same raspberry pi, and even wrote myself a guide of the steps to follow, but now, following the same steps, something is broken.
kaiko requires go
, but a more recent version of go
then found in the raspberry pi repos, so I download and install go
from scratch. go
requires go
to compile, so I first install it (an older version) from the repos, and then remove it after it's done compiling a more recent version of itself:
Install go
:
ANSWER
Answered 2022-Feb-04 at 19:56Based on the comments, my suggestion is to add $HOME/go/bin
to the path and use the default GOPATH.
Go mod depends on the bin directory inside the GOPATH. It installs new packages there. The go binary itself can actually reside somewhere else. If you follow these install instruction https://go.dev/doc/install, go itself will actually be in /usr/local/go
but the GOPATH
is still $HOME/go
.
I would also recommend, not involving apt in this at all. This looks like trouble in the form of conflicts with different installations.
QUESTION
Beginner Question: What is a simple way to rename a variable observation in a dataframe column?
I have dataframe "Stuff" with a column of categorical data called "Age" where one of the data variables is called "Age80+". I've learned that R does not like "+" in a name,
e.g. Age80+ <- brings up an error
In column "Age" there are 7 other variable numbers, e.g. "Age18_30" so I cannot manually change the observation names efficiently.
I have looked but I haven't found a simple way to rename all "Age80+" to "Age80plus" without bringing in complicated packages like "stringer" or "dplyr". The dataframe has 100's of "Age80+" observations.
Thank you
I have tried
...ANSWER
Answered 2022-Jan-02 at 17:04+
is a special character aka regular expression, that you may escape \\+
if you want the actual character.
QUESTION
Hello I am trying to change sugar logger to global longer I checked possible fields which I can use but I couldn't something solve my problem
for example in some situations I use
...ANSWER
Answered 2021-Dec-12 at 03:40The definition of Logger.Info is:
QUESTION
I'm trying run generate
on CGO project https://github.com/libgit2/git2go locally. I have successfully installed libgit2
system library and can build and test the project with go build -tags static,system_libgit2
and go test -tags static,system_libgit2
.
The problem occurs when I try to generate additional files with stringer
. The code I'm showing is located in master branch, so I suppose it should work correctly and the problem is on my side.
The file diff.go has stringer annotation (removed unimportant parts):
...ANSWER
Answered 2021-Oct-14 at 15:49stringer
works by simply parsing Go source with go.ast
to extract the needed constant values. The values must be integer literals specified at the definition site (see source).
CGo works by generating Go shims for C code. For example, C constants go into the _cgo_gotypes.go
file as const _Ciconst_... = ...
shims.
Normally CGo deletes generated files when done, but you can keep them by invoking it explicitly, e.g. go tool cgo main.go
.
So you should be able to do something like this:
QUESTION
So I have data as follows in Snowflake:
...ANSWER
Answered 2021-Aug-05 at 21:29You can use conditional aggregation:
QUESTION
There is an interface Comment that has to be implemented in order to be accessible by a package functionality. Though implementing the interface and then making a slice of CommentTest objects but with Comment as items type makes the Title public property undefined. PS: Stringer works fine in this case. Is there a way to make it work without type assertion?
...ANSWER
Answered 2021-Jul-06 at 16:48Interfaces only provide access to methods, not fields (they're agnostic to the field layout of whatever hides behind them, or whether it's even a struct). You can add a GetTitle()
method to the interface, and use that.
QUESTION
Here is the example database that I have.
...ANSWER
Answered 2021-Mar-10 at 04:47You can use str_remove
:
QUESTION
I have a type called Password that is simply a string. I'd like to implement the Stringer interface by providing a String() method that redacts the value.
...ANSWER
Answered 2021-Jan-30 at 00:11This is from the package fmt documentation:
When printing a struct, fmt cannot and therefore does not invoke formatting methods such as Error or String on unexported fields.
The field password
is not exported, so it is not inspected to figure out it implements Stringer. Export it, and it will work:
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Install stringer
To get started using Stringer for development you first need to install foreman. Then run the following commands. The application will be running on port 5000. You can launch an interactive console (a la rails c) using racksh.
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