How Can I Achieve Generic Error Handling in Go Without Generics?

Generic Error Handling Function without Generics

In Go, the absence of generics poses challenges when working with error handling. Let's consider the following example:

<code class="go">func P(any interface{}, err error) (interface{}) {
    if err != nil {
        panic("error: "+ err.Error())
    }
    return any
}</code>

The intent of this function is to fail on any error and wrap any function that returns a value and an error. While it works functionally, the any type loses its type information, resulting in an empty interface in the return value.

To address this issue, one potential solution is to generate separate implementations of the P() function for each concrete type required. This approach allows you to use the correct type instead of interface{}, making it easier to work with external library functions.

Several libraries and tools exist for generating such functions dynamically. Here are some notable examples:

• "Generic programming in Go using "go generate""
• "joeshaw/gengen"
• "cheekybits/genny"
• "clipperhouse/gen"
• "Achieving type generic functions in Go, without using reflections"

By using these tools, you can create type-specific versions of the P() function, preserving the type information and simplifying the integration with library functions.

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