Recent questions tagged go

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go - What does a function without body mean?

I'm reading the code that package time, and then I want to know how the func After(d Duration) <-chan Time ... of Go wrote it like this Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Is it possible get information about caller function in Golang?

Is it possible get information about caller function in Golang? For example if I have func foo() { ... to use CallerMemberName class attribute) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Instance new Type (Golang)

Can anyone tell me how to create a new instance of Type from a string? Reflect? There are examples but they are ... ) of the language [:(] See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Map with concurrent access

When you use a map in a program with concurrent access, is there any need to use a mutex in functions to read values? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Why are interfaces needed in Golang?

In Golang, we use structs with receiver methods. everything is perfect up to here. I'm not sure what interfaces ... why I need an interface? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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645 views

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go - How to reduce compiled file size?

Lets compare c and go: Hello_world.c : #include<stdio.h> int main(){ printf("Hello world!"); } Hello_world.go ... (strip Hello_go -> 893K only) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Example for sync.WaitGroup correct?

Is this example usage of sync.WaitGroup correct? It gives the expected result, but I am unsure about the ... background, duration: 600ms Done See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - How to get Type representation from name via reflection?

Is there a way to use the reflection libraries in Go to go from the name of a type to its Type ... just get representation from the name? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Why do these goroutines not scale their performance from more concurrent executions?

Background I am currently working on my bachelor thesis and basically my task is to optimise a given code ... benchmarkMoving_avg_concurrent2(b, 261*10, 1) } func BenchmarkMoving...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - How to collect values from N goroutines executed in a specific order?

Below is a struct of type Stuff. It has three ints. A Number, its Double and its Power. Let's pretend that ... / powers belong to what numbers. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - package's type cannot be used as the vendored package's type

I'm trying to use this Golang Yelp API package. In some of its structs, it uses types defined in guregu's null ... Any Ideas on how to fix this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Strange type definition syntax in Golang (name, then type, then string literal)

I've been trying to find out how to use mgo (MongoDB driver for Go) and I came across this struct ... know how to google this either. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - How to escape back ticks

MySQL requires tables that shadow reserved words to be back ticked. I have a table Role which is a reserved word, ... (err) } fmt.Println(roles) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Why does fmt.Println inside a goroutine not print a line?

I have the following code: package main import "net" import "fmt" import "bufio" func main() { conn, _ := ... . Can someone explain why that is? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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800 views

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go - Golang defer behavior

Effective Go states the following regarding defer: The arguments to the deferred function (which include the ... missing something here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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915 views

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go - What could happen if I don't close response.Body?

In Go, I have some http responses and I sometimes forget to call: resp.Body.Close() What happens in this case? ... resp or resp.Body be nil? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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858 views

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go - Access struct property by name

Here is a simple go program that is not working : package main import "fmt" type Vertex struct { X int Y int } ... me how to make this work ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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888 views

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go - Max number of goroutines

How many goroutines can I use painless? For example wikipedia says, in Erlang 20 million processes can be created without ... costs 4 - 4.5 KB See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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757 views

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go - Collect values in order, each containing a map

When iterating through the returned map in the code, returned by the topic function, the keys are not appearing in ... ? Here is the code. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - How to stop http.ListenAndServe()

I am using the Mux library from Gorilla Web Toolkit along with the bundled Go http server. The problem is that ... Are there any new solutions? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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936 views

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go - range over interface{} which stores a slice

Given the scenario where you have a function which accepts t interface{}. If it is determined that the t is ... ://play.golang.org/p/DNldAlNShB See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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985 views

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go - How to compare if two structs, slices or maps are equal?

I want to check if two structs, slices and maps are equal. But I'm running into problems with the following ... ://play.golang.org/p/AZIzW2WunI See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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839 views

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go - how to listen to N channels? (dynamic select statement)

to start an endless loop of executing two goroutines, I can use the code below: after receiving the msg it will start ... go DoStuff(c2, 9) } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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702 views

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go - Application auto build versioning

Is it possible to increment a minor version number automatically each time a Go app is compiled? I would like to ... . Is this possible in Go? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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814 views

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go - Accessing struct fields inside a map value (without copying)

Assuming the following type User struct { name string } users := make(map[int]User) users[5] = User{"Steve"} ... don't want to do that either. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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775 views

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go - `append` complexity

What is the computational complexity of this loop in the Go programming language? var a []int for i := 0 ... in many languages are implemnted)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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921 views

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go - Using positive-lookahead (?=regex) with re2

Since I'm a bit new with re2, I'm trying to figure out how to use positive-lookahead (?=regex) like JS, C++ ... match 'foo bar ' Thanks a lot. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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816 views

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go - How to ignore nulls while unmarshalling a MongoDB document?

I would like to know if there's any approach that would allow me to ignore null types while unmarshalling a ... -go-driver for this problem? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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