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//===-- DeclFriend.h - Classes for C++ friend declarations -*- C++ -*------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the section of the AST representing C++ friend
// declarations.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_DECLFRIEND_H
#define LLVM_CLANG_AST_DECLFRIEND_H
#include "clang/AST/DeclCXX.h"
namespace clang {
/// FriendDecl - Represents the declaration of a friend entity,
/// which can be a function, a type, or a templated function or type.
// For example:
///
/// @code
/// template <typename T> class A {
/// friend int foo(T);
/// friend class B;
/// friend T; // only in C++0x
/// template <typename U> friend class C;
/// template <typename U> friend A& operator+=(A&, const U&) { ... }
/// };
/// @endcode
///
/// The semantic context of a friend decl is its declaring class.
class FriendDecl : public Decl {
public:
typedef llvm::PointerUnion<NamedDecl*,Type*> FriendUnion;
private:
// The declaration that's a friend of this class.
FriendUnion Friend;
// Location of the 'friend' specifier.
SourceLocation FriendLoc;
// FIXME: Hack to keep track of whether this was a friend function
// template specialization.
bool WasSpecialization;
FriendDecl(DeclContext *DC, SourceLocation L, FriendUnion Friend,
SourceLocation FriendL)
: Decl(Decl::Friend, DC, L),
Friend(Friend),
FriendLoc(FriendL),
WasSpecialization(false) {
}
public:
static FriendDecl *Create(ASTContext &C, DeclContext *DC,
SourceLocation L, FriendUnion Friend_,
SourceLocation FriendL);
/// If this friend declaration names an (untemplated but
/// possibly dependent) type, return the type; otherwise
/// return null. This is used only for C++0x's unelaborated
/// friend type declarations.
Type *getFriendType() const {
return Friend.dyn_cast<Type*>();
}
/// If this friend declaration doesn't name an unelaborated
/// type, return the inner declaration.
NamedDecl *getFriendDecl() const {
return Friend.dyn_cast<NamedDecl*>();
}
/// Retrieves the location of the 'friend' keyword.
SourceLocation getFriendLoc() const {
return FriendLoc;
}
bool wasSpecialization() const { return WasSpecialization; }
void setSpecialization(bool WS) { WasSpecialization = WS; }
// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classof(const FriendDecl *D) { return true; }
static bool classofKind(Kind K) { return K == Decl::Friend; }
};
}
#endif
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