Can a Go Struct Literal Directly Assign a True Boolean Pointer Without Extra Variables?

Setting Boolean Pointer to True in Struct Literals

Question:

A function requires a pointer to a boolean value. Can a struct literal be used to set the field to true without introducing additional variables?

Answer:

Yes, it is possible, but not ideal:

h := handler{is: &[]bool{true}[0]}

This solution creates a slice with a single boolean value of true, indexes its first element, and assigns its address to the is field. While new variables are avoided, the boilerplate and persistence of the backing array present drawbacks.

Better Solutions:

• Helper Function:

func newTrue() *bool {
    b := true
    return &b
}

h := handler{is: newTrue()}

• Anonymous Function:

h := handler{is: func() *bool { b := true; return &b }()}

• One-Liner Variant:

h := handler{is: func(b bool) *bool { return &b }(true)}

For more options, refer to "How do I do a literal *int64 in Go?".

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