1 files changed, 49 insertions, 0 deletions
diff --git a/clang-tools-extra/clang-tidy/bugprone/MoveForwardingReferenceCheck.h b/clang-tools-extra/clang-tidy/bugprone/MoveForwardingReferenceCheck.h
new file mode 100644
index 00000000000..c61de757d74
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/bugprone/MoveForwardingReferenceCheck.h
@@ -0,0 +1,49 @@
+//===--- MoveForwardingReferenceCheck.h - clang-tidy ----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_MOVEFORWARDINGREFERENCECHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_MOVEFORWARDINGREFERENCECHECK_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace bugprone {
+
+/// The check warns if std::move is applied to a forwarding reference (i.e. an
+/// rvalue reference of a function template argument type).
+///
+/// If a developer is unaware of the special rules for template argument
+/// deduction on forwarding references, it will seem reasonable to apply
+/// std::move to the forwarding reference, in the same way that this would be
+/// done for a "normal" rvalue reference.
+///
+/// This has a consequence that is usually unwanted and possibly surprising: if
+/// the function that takes the forwarding reference as its parameter is called
+/// with an lvalue, that lvalue will be moved from (and hence placed into an
+/// indeterminate state) even though no std::move was applied to the lvalue at
+/// the call site.
+//
+/// The check suggests replacing the std::move with a std::forward.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/bugprone-move-forwarding-reference.html
+class MoveForwardingReferenceCheck : public ClangTidyCheck {
+public:
+  MoveForwardingReferenceCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace bugprone
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_MOVEFORWARDINGREFERENCECHECK_H