forked from OSchip/llvm-project
75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
//===-- PassByValueActions.h ------------------------------------*- C++ -*-===//
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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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///
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/// \file
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/// \brief This file contains the declaration of the ASTMatcher callback for the
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/// PassByValue transform.
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///
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//===----------------------------------------------------------------------===//
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#ifndef CLANG_MODERNIZE_PASS_BY_VALUE_ACTIONS_H
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#define CLANG_MODERNIZE_PASS_BY_VALUE_ACTIONS_H
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/Tooling/Refactoring.h"
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class Transform;
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class IncludeDirectives;
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/// \brief Callback that replaces const-ref parameters in constructors to use
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/// pass-by-value semantic where applicable.
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///
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/// Modifications done by the callback:
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/// - \#include \<utility\> is added if necessary for the definition of
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/// \c std::move() to be available.
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/// - The parameter type is changed from const-ref to value-type.
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/// - In the init-list the parameter is moved.
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///
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/// Example:
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/// \code
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/// + #include <utility>
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///
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/// class Foo(const std::string &S) {
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/// public:
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/// - Foo(const std::string &S) : S(S) {}
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/// + Foo(std::string S) : S(std::move(S)) {}
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///
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/// private:
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/// std::string S;
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/// };
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/// \endcode
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///
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/// \note Since an include may be added by this matcher it's necessary to call
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/// \c setIncludeDirectives() with an up-to-date \c IncludeDirectives. This is
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/// typically done by overloading \c Transform::handleBeginSource().
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class ConstructorParamReplacer
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: public clang::ast_matchers::MatchFinder::MatchCallback {
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public:
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ConstructorParamReplacer(unsigned &AcceptedChanges, unsigned &RejectedChanges,
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Transform &Owner)
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: AcceptedChanges(AcceptedChanges), RejectedChanges(RejectedChanges),
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Owner(Owner), IncludeManager(nullptr) {}
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void setIncludeDirectives(IncludeDirectives *Includes) {
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IncludeManager = Includes;
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}
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private:
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/// \brief Entry point to the callback called when matches are made.
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virtual void run(const clang::ast_matchers::MatchFinder::MatchResult &Result)
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override;
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unsigned &AcceptedChanges;
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unsigned &RejectedChanges;
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Transform &Owner;
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IncludeDirectives *IncludeManager;
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};
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#endif // CLANG_MODERNIZE_PASS_BY_VALUE_ACTIONS_H
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