259 lines
8.6 KiB
C
259 lines
8.6 KiB
C
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//===--- TemplateName.h - C++ Template Name Representation-------*- 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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// This file defines the TemplateName interface and subclasses.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_AST_TEMPLATENAME_H
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#define LLVM_CLANG_AST_TEMPLATENAME_H
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/ADT/PointerUnion.h"
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namespace llvm {
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class raw_ostream;
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}
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namespace clang {
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class DependentTemplateName;
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class IdentifierInfo;
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class NestedNameSpecifier;
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class PrintingPolicy;
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class QualifiedTemplateName;
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class TemplateDecl;
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/// \brief Represents a C++ template name within the type system.
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///
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/// A C++ template name refers to a template within the C++ type
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/// system. In most cases, a template name is simply a reference to a
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/// class template, e.g.
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///
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/// \code
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/// template<typename T> class X { };
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///
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/// X<int> xi;
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/// \endcode
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///
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/// Here, the 'X' in \c X<int> is a template name that refers to the
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/// declaration of the class template X, above. Template names can
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/// also refer to function templates, C++0x template aliases, etc.
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///
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/// Some template names are dependent. For example, consider:
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///
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/// \code
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/// template<typename MetaFun, typename T1, typename T2> struct apply2 {
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/// typedef typename MetaFun::template apply<T1, T2>::type type;
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/// };
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/// \endcode
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///
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/// Here, "apply" is treated as a template name within the typename
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/// specifier in the typedef. "apply" is a nested template, and can
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/// only be understood in the context of
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class TemplateName {
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typedef llvm::PointerUnion3<TemplateDecl *, QualifiedTemplateName *,
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DependentTemplateName *> StorageType;
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StorageType Storage;
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explicit TemplateName(void *Ptr) {
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Storage = StorageType::getFromOpaqueValue(Ptr);
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}
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public:
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TemplateName() : Storage() { }
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explicit TemplateName(TemplateDecl *Template) : Storage(Template) { }
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explicit TemplateName(QualifiedTemplateName *Qual) : Storage(Qual) { }
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explicit TemplateName(DependentTemplateName *Dep) : Storage(Dep) { }
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/// \brief Retrieve the the underlying template declaration that
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/// this template name refers to, if known.
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///
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/// \returns The template declaration that this template name refers
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/// to, if any. If the template name does not refer to a specific
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/// declaration because it is a dependent name, returns NULL.
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TemplateDecl *getAsTemplateDecl() const;
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/// \brief Retrieve the underlying qualified template name
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/// structure, if any.
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QualifiedTemplateName *getAsQualifiedTemplateName() const {
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return Storage.dyn_cast<QualifiedTemplateName *>();
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}
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/// \brief Retrieve the underlying dependent template name
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/// structure, if any.
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DependentTemplateName *getAsDependentTemplateName() const {
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return Storage.dyn_cast<DependentTemplateName *>();
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}
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/// \brief Determines whether this is a dependent template name.
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bool isDependent() const;
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/// \brief Print the template name.
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///
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/// \param OS the output stream to which the template name will be
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/// printed.
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///
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/// \param SuppressNNS if true, don't print the
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/// nested-name-specifier that precedes the template name (if it has
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/// one).
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void print(llvm::raw_ostream &OS, const PrintingPolicy &Policy,
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bool SuppressNNS = false) const;
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/// \brief Debugging aid that dumps the template name to standard
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/// error.
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void dump() const;
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void Profile(llvm::FoldingSetNodeID &ID) {
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ID.AddPointer(Storage.getOpaqueValue());
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}
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/// \brief Retrieve the template name as a void pointer.
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void *getAsVoidPointer() const { return Storage.getOpaqueValue(); }
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/// \brief Build a template name from a void pointer.
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static TemplateName getFromVoidPointer(void *Ptr) {
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return TemplateName(Ptr);
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}
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};
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/// \brief Represents a template name that was expressed as a
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/// qualified name.
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///
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/// This kind of template name refers to a template name that was
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/// preceded by a nested name specifier, e.g., \c std::vector. Here,
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/// the nested name specifier is "std::" and the template name is the
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/// declaration for "vector". The QualifiedTemplateName class is only
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/// used to provide "sugar" for template names that were expressed
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/// with a qualified name, and has no semantic meaning. In this
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/// manner, it is to TemplateName what QualifiedNameType is to Type,
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/// providing extra syntactic sugar for downstream clients.
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class QualifiedTemplateName : public llvm::FoldingSetNode {
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/// \brief The nested name specifier that qualifies the template name.
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///
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/// The bit is used to indicate whether the "template" keyword was
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/// present before the template name itself. Note that the
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/// "template" keyword is always redundant in this case (otherwise,
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/// the template name would be a dependent name and we would express
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/// this name with DependentTemplateName).
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llvm::PointerIntPair<NestedNameSpecifier *, 1> Qualifier;
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/// \brief The template declaration that this qualified name refers
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/// to.
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TemplateDecl *Template;
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friend class ASTContext;
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QualifiedTemplateName(NestedNameSpecifier *NNS, bool TemplateKeyword,
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TemplateDecl *Template)
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: Qualifier(NNS, TemplateKeyword? 1 : 0), Template(Template) { }
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public:
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/// \brief Return the nested name specifier that qualifies this name.
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NestedNameSpecifier *getQualifier() const { return Qualifier.getPointer(); }
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/// \brief Whether the template name was prefixed by the "template"
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/// keyword.
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bool hasTemplateKeyword() const { return Qualifier.getInt(); }
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/// \brief The template declaration to which this qualified name
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/// refers.
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TemplateDecl *getTemplateDecl() const { return Template; }
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void Profile(llvm::FoldingSetNodeID &ID) {
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Profile(ID, getQualifier(), hasTemplateKeyword(), getTemplateDecl());
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}
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static void Profile(llvm::FoldingSetNodeID &ID, NestedNameSpecifier *NNS,
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bool TemplateKeyword, TemplateDecl *Template) {
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ID.AddPointer(NNS);
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ID.AddBoolean(TemplateKeyword);
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ID.AddPointer(Template);
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}
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};
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/// \brief Represents a dependent template name that cannot be
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/// resolved prior to template instantiation.
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///
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/// This kind of template name refers to a dependent template name,
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/// including its nested name specifier. For example,
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/// DependentTemplateName can refer to "MetaFun::template apply",
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/// where "MetaFun::" is the nested name specifier and "apply" is the
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/// template name referenced. The "template" keyword is implied.
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class DependentTemplateName : public llvm::FoldingSetNode {
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/// \brief The nested name specifier that qualifies the template
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/// name.
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NestedNameSpecifier *Qualifier;
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/// \brief The dependent template name.
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const IdentifierInfo *Name;
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/// \brief The canonical template name to which this dependent
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/// template name refers.
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///
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/// The canonical template name for a dependent template name is
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/// another dependent template name whose nested name specifier is
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/// canonical.
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TemplateName CanonicalTemplateName;
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friend class ASTContext;
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DependentTemplateName(NestedNameSpecifier *Qualifier,
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const IdentifierInfo *Name)
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: Qualifier(Qualifier), Name(Name), CanonicalTemplateName(this) { }
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DependentTemplateName(NestedNameSpecifier *Qualifier,
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const IdentifierInfo *Name,
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TemplateName Canon)
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: Qualifier(Qualifier), Name(Name), CanonicalTemplateName(Canon) { }
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public:
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/// \brief Return the nested name specifier that qualifies this name.
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NestedNameSpecifier *getQualifier() const { return Qualifier; }
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/// \brief Return the name to which this dependent template name
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/// refers.
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const IdentifierInfo *getName() const { return Name; }
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void Profile(llvm::FoldingSetNodeID &ID) {
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Profile(ID, getQualifier(), getName());
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}
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static void Profile(llvm::FoldingSetNodeID &ID, NestedNameSpecifier *NNS,
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const IdentifierInfo *Name) {
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ID.AddPointer(NNS);
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ID.AddPointer(Name);
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}
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};
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} // end namespace clang.
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namespace llvm {
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/// \brief The clang::TemplateName class is effectively a pointer.
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template<>
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class PointerLikeTypeTraits<clang::TemplateName> {
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public:
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static inline void *getAsVoidPointer(clang::TemplateName TN) {
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return TN.getAsVoidPointer();
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}
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static inline clang::TemplateName getFromVoidPointer(void *Ptr) {
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return clang::TemplateName::getFromVoidPointer(Ptr);
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}
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// No bits are available!
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enum { NumLowBitsAvailable = 0 };
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};
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} // end namespace llvm.
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#endif
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