How Can We Implement Generic Error Handling in Go Without Losing Type Information?

Error Handling Generics with Must Function

When working with functions that return both a value and an error, handling errors can be cumbersome. The lack of generics in Go makes it challenging to develop a solution that works for all possible scenarios.

The example provided attempts to create a function named P that wraps any such function, failing if an error occurs. While effective in handling errors, it loses type information, resulting in an empty interface.

One potential solution involves using code generation techniques to create specific implementations of P for each concrete type you need to work with. By using a library like "gengen," "genny," or "gen," you can generate custom instances of P that retain the proper type information.

For instance, if your function returns an integer and an error:

<code class="go">func MyFunction() (int, error) {
    ...
}</code>

Using a code generator, you could create a specific implementation of P for this function:

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

This approach ensures that the type information is maintained, allowing you to call P_MyFunction and work with the returned integer seamlessly. However, it requires generating a specific implementation for each function and type combination, which can be tedious if you have many such functions.

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