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//===--- MoveForwardingReferenceCheck.h - clang-tidy ----------------------===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "../ClangTidyCheck.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:
class MoveForwardingReferenceCheck : public ClangTidyCheck {
MoveForwardingReferenceCheck(StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context) {}
bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
return LangOpts.CPlusPlus11;
void registerMatchers(ast_matchers::MatchFinder *Finder) override;
void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
} // namespace bugprone
} // namespace tidy
} // namespace clang