Home >Backend Development >Golang >How Can I Retrieve a Byte Slice from a String in Go Without Memory Copying?
Problem:
You need to convert a string to a byte slice without incurring the performance penalty of memory copy, particularly for handling large data sets.
Answer:
Step 1: Understand the Memory Copy Issue
Strings in Go are immutable, meaning they cannot be modified in place. Therefore, converting a string to a byte slice using the []byte(string) syntax results in a memory copy.
Step 2: Using Unsafe
To prevent memory copying, unsafe operations can be employed. The unsafe String function can be used to retrieve a pointer to the underlying string data.
<code class="go">import "unsafe" func unsafeGetBytes(s string) []byte { return (*[0x7fff0000]byte)(unsafe.Pointer( (*reflect.StringHeader)(unsafe.Pointer(&s)).Data), )[:len(s):len(s)] }</code>
Explanation:
Additional Considerations:
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