How Can Go\'s Lack of Generics Be Overcome to Achieve Type-Preserving Error Handling?

Customizable Error Handling: A Type-Preserving Solution

Despite Go's lack of generics, you can still achieve type-preserving error handling. Consider the following P() function:

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

However, casting to an empty interface () results in the loss of type information. To address this, consider the use of Go generation.

Generation-Based Approach:

You can generate specific implementations of P() for each type you need to handle. Here's a list of resources to guide you:

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

By generating concrete P() functions, you can preserve type information and simplify the handling of errors from lib functions.

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