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