dongnao9525 2018-04-12 06:02
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如何在golang中的所有包中访问全局常量?

I have a constant defined within a package in golang as such:

package services

const (
   Source = "local"
)

I would like to make this constant accessible by other packages without having to import the package into my other module. How can I go about that?

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  • douwendu2460 2018-04-12 06:35
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    You cannot refer to services.Source without importing services.

    However, you can avoid the dependency by creating a new constant in another package that happens to have the same value, and verify that with a test. That is, your test imports services, but your production code does not. The stdlib does this here and there to avoid a few dependencies.

    // services.go
    package services
    
    const Source = "local"
    
    // foo.go
    package foo
    
    const Source = "local"
    
    // foo_test.go
    package foo
    
    import (
        "services"
        "testing"
    )
    
    func TestSource(t *testing.T) {
        if Source != services.Source {
            t.Error("Source != services.Source")
        }
    }
    
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