How to Retrieve a Function Name Using Reflection in Go?

Accessing Function Name with Reflection in Go

Reflection in Go allows developers to introspect the types and values of any variable. One common task is to retrieve the name of a function. However, attempts to access the Name method directly on the type of the function may result in an empty string.

Expected Behavior

The provided code snippet correctly imports the necessary packages for reflection. However, the issue arises when attempting to retrieve the function name directly from the type.

name := typ.Name()

This approach does not yield the expected result because the Name method operates on the actual function pointer, not the type. To obtain the correct name, the FuncForPC function from the runtime package must be used.

Solution

The FuncForPC function takes the pointer to the reflect.Value of the function and returns a *Func object. This object provides the correct Name method, which can be used to retrieve the name of the function.

name := runtime.FuncForPC(reflect.ValueOf(main).Pointer()).Name()

Using the provided demonstration, the code will now correctly print "main.main". If only the function name is desired, it can be extracted by splitting the returned string.

Conclusion

By utilizing reflection and the FuncForPC function, developers can accurately retrieve the name of any function in Go. This technique enables various use cases, such as inspecting code structure and performing dynamic function calls.

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