1//===--- MoveForwardingReferenceCheck.h - clang-tidy ----------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_MOVEFORWARDINGREFERENCECHECK_H
10#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_MOVEFORWARDINGREFERENCECHECK_H
11
12#include "../ClangTidyCheck.h"
13
14namespace clang::tidy::bugprone {
15
16/// The check warns if std::move is applied to a forwarding reference (i.e. an
17/// rvalue reference of a function template argument type).
18///
19/// If a developer is unaware of the special rules for template argument
20/// deduction on forwarding references, it will seem reasonable to apply
21/// std::move to the forwarding reference, in the same way that this would be
22/// done for a "normal" rvalue reference.
23///
24/// This has a consequence that is usually unwanted and possibly surprising: if
25/// the function that takes the forwarding reference as its parameter is called
26/// with an lvalue, that lvalue will be moved from (and hence placed into an
27/// indeterminate state) even though no std::move was applied to the lvalue at
28/// the call site.
29//
30/// The check suggests replacing the std::move with a std::forward.
31///
32/// For the user-facing documentation see:
33/// http://clang.llvm.org/extra/clang-tidy/checks/bugprone/move-forwarding-reference.html
34class MoveForwardingReferenceCheck : public ClangTidyCheck {
35public:
36 MoveForwardingReferenceCheck(StringRef Name, ClangTidyContext *Context)
37 : ClangTidyCheck(Name, Context) {}
38 bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
39 return LangOpts.CPlusPlus11;
40 }
41 void registerMatchers(ast_matchers::MatchFinder *Finder) override;
42 void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
43};
44
45} // namespace clang::tidy::bugprone
46
47#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_MOVEFORWARDINGREFERENCECHECK_H
48

source code of clang-tools-extra/clang-tidy/bugprone/MoveForwardingReferenceCheck.h