AK: Rename ValueRestorer => ScopedValueRollback.

Qt had a pretty good name for this concept, so let's steal it. :^)

AK/LogStream.h

@@ -3,7 +3,7 @@
 #include <AK/kstdio.h>
 
 #ifdef USERLAND
-#include <AK/ValueRestorer.h>
+#include <AK/ScopedValueRollback.h>
 #include <errno.h>
 #endif
 
@@ -77,7 +77,7 @@ protected:
 
 private:
 #ifdef USERLAND
-    ValueRestorer<int> m_errno_restorer;
+    ScopedValueRollback<int> m_errno_restorer;
 #endif
 };
 

AK/ScopedValueRollback.h

@@ -3,15 +3,15 @@
 namespace AK {
 
 template<typename T>
-class ValueRestorer {
+class ScopedValueRollback {
 public:
-    ValueRestorer(T& variable)
+    ScopedValueRollback(T& variable)
         : m_variable(variable)
         , m_saved_value(variable)
     {
     }
 
-    ~ValueRestorer()
+    ~ScopedValueRollback()
     {
         m_variable = m_saved_value;
     }
@@ -23,4 +23,4 @@ private:
 
 }
 
-using AK::ValueRestorer;
+using AK::ScopedValueRollback;

Libraries/LibC/stdio.cpp

@@ -1,6 +1,6 @@
 #include <AK/PrintfImplementation.h>
+#include <AK/ScopedValueRollback.h>
 #include <AK/StdLibExtras.h>
-#include <AK/ValueRestorer.h>
 #include <Kernel/Syscall.h>
 #include <assert.h>
 #include <errno.h>
@@ -510,7 +510,7 @@ FILE* popen(const char* command, const char* type)
 
     int rc = pipe(pipe_fds);
     if (rc < 0) {
-        ValueRestorer restorer(errno);
+        ScopedValueRollback rollback(errno);
         perror("pipe");
         return nullptr;
     }