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//===-- PassByValueActions.h ------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief This file contains the declaration of the ASTMatcher callback for the
/// PassByValue transform.
///
//===----------------------------------------------------------------------===//
#ifndef CPP11_MIGRATE_PASS_BY_VALUE_ACTIONS_H
#define CPP11_MIGRATE_PASS_BY_VALUE_ACTIONS_H
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Tooling/Refactoring.h"
class Transform;
class IncludeDirectives;
/// \brief Callback that replaces const-ref parameters in constructors to use
/// pass-by-value semantic where applicable.
///
/// Modifications done by the callback:
/// - \#include \<utility\> is added if necessary for the definition of
/// \c std::move() to be available.
/// - The parameter type is changed from const-ref to value-type.
/// - In the init-list the parameter is moved.
///
/// Example:
/// \code
/// + #include <utility>
///
/// class Foo(const std::string &S) {
/// public:
/// - Foo(const std::string &S) : S(S) {}
/// + Foo(std::string S) : S(std::move(S)) {}
///
/// private:
/// std::string S;
/// };
/// \endcode
///
/// \note Since an include may be added by this matcher it's necessary to call
/// \c setIncludeDirectives() with an up-to-date \c IncludeDirectives. This is
/// typically done by overloading \c Transform::handleBeginSource().
class ConstructorParamReplacer
: public clang::ast_matchers::MatchFinder::MatchCallback {
public:
ConstructorParamReplacer(unsigned &AcceptedChanges, unsigned &RejectedChanges,
Transform &Owner)
: AcceptedChanges(AcceptedChanges), RejectedChanges(RejectedChanges),
Owner(Owner), IncludeManager(0) {}
void setIncludeDirectives(IncludeDirectives *Includes) {
IncludeManager = Includes;
}
private:
/// \brief Entry point to the callback called when matches are made.
virtual void run(const clang::ast_matchers::MatchFinder::MatchResult &Result)
LLVM_OVERRIDE;
unsigned &AcceptedChanges;
unsigned &RejectedChanges;
Transform &Owner;
IncludeDirectives *IncludeManager;
};
#endif // CPP11_MIGRATE_PASS_BY_VALUE_ACTIONS_H
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