Can You Access `reflect.Type` from Go Types Without Instantiation?

Mary-Kate Olsen
Release: 2024-11-09 22:14:02
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Can You Access `reflect.Type` from Go Types Without Instantiation?

Accessing Reflect.Type from Go Types

In Go, it is necessary to utilize reflection to access the reflect.Type information of specific data structures or types. This article explores two scenarios related to obtaining reflect.Type information:

  1. Retrieving Reflect.Type without Instantiation:

    Is it feasible to acquire the reflect.Type of a struct (t1) without creating an instance of it?

    Answer: Yes. To achieve this, one can employ the following approach:

    var v1 reflect.Type = reflect.TypeOf((*t1)(nil)).Elem()
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    This technique utilizes a typed nil value. While Go does not offer type literals, it is possible to obtain the reflect.Type from a typed nil value.

  2. Retrieving Reflect.Type from a String:

    Is it possible to derive the reflect.Type of t1 given only its string name, "t1"?

    Answer: No. This operation is not supported natively within Go. The runtime would need to keep track of all types within the binary, which presents challenges.

    While a type registry package and string-based type registration are feasible approaches, the scenario can become complex due to anonymous types and the potential for name duplication. The Go runtime itself is unlikely to incorporate a feature for retrieving types from string names.

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