How Can I Assign `true` to a `bool` Pointer in a Go Struct Literal Without Defining Extra Variables?

Assigning True to Bool Pointers in Go Struct Literals

Go programmers often encounter situations where they need to set bool pointers to true within struct literals. This article delves into the available options for achieving this goal without defining new identifiers.

The provided code snippet showcases a function that takes a bool pointer, prompting the question of whether a construct exists that allows the is field to be set to true in the struct literal itself.

Approaches to Setting True:

1. Array Indexing (Not Optimal):

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

This method involves creating an array with a single bool set to true, indexing it, and assigning the address of the indexed element. While it does not require additional variables, the boilerplate and memory consumption are drawbacks.

2. Helper Function with Pointer Return:

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

This approach introduces a helper function that returns the address of a true bool variable. It is used as follows:

h := handler{is: newTrue()}

This provides a cleaner and customizable solution.

3. Anonymous Function with Closure:

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

The anonymous function technique uses a closure to provide the desired functionality.

4. Functional Option with Closure:

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

This option offers a functional programming approach, where the bool value is passed as an argument.

Optimal Solution:

The most optimal solution for most scenarios is to use a helper function like newTrue(), as it provides a concise and reusable way to set bool pointers to true in struct literals.

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