LibJS: Make Optional<Utf16String> use less space

By specializing the template, we can shrink it from 16 to 8 bytes. This makes PrimitiveString a measly 32 bytes. :^)
Author: https://github.com/awesomekling Commit: 4dc63ddf49 Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4149 Reviewed-by: https://github.com/Hendiadyoin1 Reviewed-by: https://github.com/tcl3 ✅
2025-07-29 20:29:18 +00:00 · 2025-03-30 00:27:45 +00:00 · 2025-03-30 00:27:45 +00:00 · 4dc63ddf49 · 2025-03-30 06:17:42 +00:00
commit 4dc63ddf49
parent 152691f9eb
2 changed files with 106 additions and 1 deletions
--- a/Libraries/LibJS/Runtime/Utf16String.cpp
+++ b/Libraries/LibJS/Runtime/Utf16String.cpp
@ -84,6 +84,12 @@ Utf16String Utf16String::create(Utf16View const& string)
    return Utf16String { Detail::Utf16StringImpl::create(string) };
 }

+Utf16String Utf16String::invalid()
+{
+    static auto invalid = Utf16String {};
+    return invalid;
+}
+
 Utf16String::Utf16String(NonnullRefPtr<Detail::Utf16StringImpl> string)
    : m_string(move(string))
 {