How Can I Efficiently Convert a CGO Array to a Go Slice?

Casting a CGO Array into a Go Slice: Better Alternatives

In Go, converting a CGO array to a slice can be accomplished by manually casting each element, as shown in the question. However, this approach can be cumbersome. Here's a more convenient method:

c := [6]C.double{1, 2, 3, 4, 5, 6}
fs := make([]float64, len(c))
for i, v := range c {
    fs[i] = float64(v)
}

This version avoids the need to manually cast each element. Instead, it iterates over the CGO array using a range loop, automatically converting each element to a float64.

Unsafe Casting (Not Recommended)

Alternatively, an unsafe pointer cast can be used to achieve the conversion:

cfa := (*[6]float64)(unsafe.Pointer(&c))
cfs := cfa[:]

This approach takes a pointer to the CGO array, unsafely casts it to a pointer to a float64 array, and then slices the resulting array. While this method may be faster, it's considered unsafe because it bypasses Go's memory safety checks.

Conclusion

While the unsafe casting method is faster, it's important to prioritize memory safety in production code. The safer and more straightforward method is to manually iterate over the array and perform the conversion explicitly.

The above is the detailed content of How Can I Efficiently Convert a CGO Array to a Go Slice?. For more information, please follow other related articles on the PHP Chinese website!