Go Slices: Why Does Copying Slice Elements Using `range` Sometimes Lead to Shared Memory Addresses?

Go: Reusing Memory Address Copying from Slice

In Go, the range function iterates over elements of a slice. However, a common pitfall is the reuse of memory addresses for loop variables. This can lead to unexpected results when attempting to copy slice elements to another data structure.

Consider the following code snippet:

In this code, the loop variable item is a pointer reference to an element in the *coll slice. By assigning &item to the elements of the output slice, multiple elements end up pointing to the same underlying Region object. This occurs because output and *coll share the same memory address for item.

To resolve this issue, it is necessary to create a distinct copy of the Region object for each element in output. This can be achieved by using the following code snippet:

In this revised code, _ is used as the loop variable for the range over *coll. This ensures that a new copy of i is created for each iteration, preventing the reuse of memory addresses across loop iterations.

Understanding the nuances of Go's memory management is crucial to avoid these types of pitfalls and ensure correct program execution.

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