================
@@ -0,0 +1,77 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "UseToUnderlyingCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
+#include "clang/Lex/Lexer.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::modernize {
+
+UseToUnderlyingCheck::UseToUnderlyingCheck(StringRef Name,
+                                           ClangTidyContext *Context)
+    : ClangTidyCheck(Name, Context),
+      Inserter(Options.getLocalOrGlobal("IncludeStyle",
+                                        utils::IncludeSorter::IS_LLVM),
+               areDiagsSelfContained()) {}
+//
+void UseToUnderlyingCheck::registerPPCallbacks(const SourceManager &SM,
+                                               Preprocessor *PP,
+                                               Preprocessor *ModuleExpanderPP) 
{
+  Inserter.registerPreprocessor(PP);
+}
+
+void UseToUnderlyingCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
+  Options.store(Opts, "IncludeStyle", Inserter.getStyle());
+}
+
+bool UseToUnderlyingCheck::isLanguageVersionSupported(
+    const LangOptions &LangOpts) const {
+  return LangOpts.CPlusPlus23;
+}
+
+void UseToUnderlyingCheck::registerMatchers(MatchFinder *Finder) {
+  // FIXME: Add matchers.
+  Finder->addMatcher(
+      cxxStaticCastExpr( // C++ cast
+          hasDestinationType(
+              isInteger()),    // casting to any type of integer (int,long,etc)
+          hasSourceExpression( // is an enum class
+              expr(hasType(enumType(hasDeclaration(enumDecl(isScoped())))))
+                  .bind("enumExpr"))) // giving the name enumExpr
+          .bind("castExpr"),          // giving the name castExpr
+      this);
+}
+
+void UseToUnderlyingCheck::check(const MatchFinder::MatchResult &Result) {
+  // Acquiring the enumExpr and castExpr using getNodeAS
+  const auto *Enum = Result.Nodes.getNodeAs<Expr>("enumExpr");
+  const auto *Cast = Result.Nodes.getNodeAs<CXXStaticCastExpr>("castExpr");
+
+  // getting contents of that node using getsourcetext
+  StringRef EnumExprText = Lexer::getSourceText(
----------------
EugeneZelenko wrote:

```suggestion
  const StringRef EnumExprText = Lexer::getSourceText(
```

https://github.com/llvm/llvm-project/pull/167212
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