Allow hex() to be used with LOG_WITH_STREAM()

https://bugs.webkit.org/show_bug.cgi?id=260945
rdar://114742843

Reviewed by Simon Fraser.

TextStream just needs to be able to use the return type of hex().

* Source/WTF/wtf/text/TextStream.cpp:
(WTF::TextStream::operator<<):
* Source/WTF/wtf/text/TextStream.h:
* Tools/TestWebKitAPI/Tests/WTF/cocoa/TextStreamCocoa.cpp:
(TEST):

Canonical link: https://commits.webkit.org/267490@main

Source/WTF/wtf/text/TextStream.cpp

@@ -142,6 +142,12 @@ TextStream& TextStream::operator<<(StringView string)
     return *this;
 }
 
+TextStream& TextStream::operator<<(HexNumberBuffer buffer)
+{
+    m_text.append(makeString(buffer));
+    return *this;
+}
+
 TextStream& TextStream::operator<<(const FormatNumberRespectingIntegers& numberToFormat)
 {
     if (hasFractions(numberToFormat.value)) {

Source/WTF/wtf/text/TextStream.h

@@ -26,6 +26,7 @@
 #pragma once
 
 #include <wtf/Forward.h>
+#include <wtf/HexNumber.h>
 #include <wtf/Markable.h>
 #include <wtf/OptionSet.h>
 #include <wtf/Ref.h>
@@ -77,6 +78,7 @@ class TextStream {
     WTF_EXPORT_PRIVATE TextStream& operator<<(const String&);
     WTF_EXPORT_PRIVATE TextStream& operator<<(ASCIILiteral);
     WTF_EXPORT_PRIVATE TextStream& operator<<(StringView);
+    WTF_EXPORT_PRIVATE TextStream& operator<<(HexNumberBuffer);
     // Deprecated. Use the NumberRespectingIntegers FormattingFlag instead.
     WTF_EXPORT_PRIVATE TextStream& operator<<(const FormatNumberRespectingIntegers&);
 

Tools/TestWebKitAPI/Tests/WTF/cocoa/TextStreamCocoa.cpp

@@ -34,3 +34,10 @@ TEST(WTF_TextStream, CFString)
     ts << reinterpret_cast<id>(const_cast<CFMutableStringRef>(CFSTR("Test")));
     EXPECT_EQ(ts.release(), "Test"_s);
 }
+
+TEST(WTF_TextStream, Hex)
+{
+    TextStream ts;
+    ts << hex(18);
+    EXPECT_EQ(ts.release(), "12"_s);
+}