Check if boolean value is set in Go
Solution 1
No, a bool has two possibilities: true
or false
. The default value of an uninitialized bool is false
. If you want a third state, you can use *bool
instead, and the default value will be nil
.
type Test struct {
Set *bool
Unset *bool
}
f := false
test := Test{ Set: &f }
fmt.Println(*test.Set) // false
fmt.Println(test.Unset) // nil
The cost for this is that it is a bit uglier to set values to literals, and you have to be a bit more careful to dereference (and check nil) when you are using the values.
Solution 2
bool
has a zero value of false
so there would be no difference between them.
Refer to the zero value section of the spec.
What problem are you trying to solve that would require that kind of check?

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Updated on June 24, 2022Comments
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