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//===--- Linkage.h - Linkage enumeration and utilities ----------*- 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 Linkage enumeration and various utility
// functions.
namespace clang {
/// \brief Describes the different kinds of linkage
/// (C++ [], C99 6.2.2) that an entity may have.
enum Linkage {
/// \brief No linkage, which means that the entity is unique and
/// can only be referred to from within its scope.
NoLinkage = 0,
/// \brief Internal linkage, which indicates that the entity can
/// be referred to from within the translation unit (but not other
/// translation units).
/// \brief External linkage within a unique namespace. From the
/// langauge perspective, these entities have external
/// linkage. However, since they reside in an anonymous namespace,
/// their names are unique to this translation unit, which is
/// equivalent to having internal linkage from the code-generation
/// point of view.
/// \brief External linkage, which indicates that the entity can
/// be referred to from other translation units.
/// \brief Determine whether the given linkage is semantically
/// external.
inline bool isExternalLinkage(Linkage L) {
return L == UniqueExternalLinkage || L == ExternalLinkage;
/// \brief Compute the minimum linkage given two linages.
static inline Linkage minLinkage(Linkage L1, Linkage L2) {
return L1 < L2? L1 : L2;
} // end namespace clang