text: //===--- LLVM.h - Import various common LLVM datatypes ----------*- C++ -*-===//
  //
  // This source file is part of the Swift.org open source project
  //
  // Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
  // Licensed under Apache License v2.0 with Runtime Library Exception
  //
  // See http://swift.org/LICENSE.txt for license information
  // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
  //
  //===----------------------------------------------------------------------===//
  //
  // This file forward declares and imports various common LLVM datatypes that
  // swift wants to use unqualified.
  //
  //===----------------------------------------------------------------------===//
  
  #ifndef SWIFT_AST_LLVM_H
  #define SWIFT_AST_LLVM_H
  
  // Do not proliferate #includes here, require clients to #include their
  // dependencies.
  // Casting.h has complex templates that cannot be easily forward declared.
  #include "llvm/Support/Casting.h"
  // None.h includes an enumerator that is desired & cannot be forward declared
  // without a definition of NoneType.
  #include "llvm/ADT/None.h"
  
  // Forward declarations.
  namespace llvm {
    // Containers
    class StringRef;
    class Twine;
    template <typename T> class SmallPtrSetImpl;
    template <typename T, unsigned N> class SmallPtrSet;
    template <typename T> class SmallVectorImpl;
    template <typename T, unsigned N> class SmallVector;
    template <unsigned N> class SmallString;
    template<typename T> class ArrayRef;
    template<typename T> class MutableArrayRef;
    template<typename T> class TinyPtrVector;
    template<typename T> class Optional;
    template <typename PT1, typename PT2> class PointerUnion;
  
    // Other common classes.
    class raw_ostream;
    class APInt;
    class APFloat;
  } // end namespace llvm
  
  
  namespace swift {
    // Casting operators.
    using llvm::isa;
    using llvm::cast;
    using llvm::dyn_cast;
    using llvm::dyn_cast_or_null;
    using llvm::cast_or_null;
  
    // Containers
    using llvm::None;
    using llvm::Optional;
    using llvm::SmallPtrSetImpl;
    using llvm::SmallPtrSet;
    using llvm::SmallString;
    using llvm::StringRef;
    using llvm::Twine;
    using llvm::SmallVectorImpl;
    using llvm::SmallVector;
    using llvm::ArrayRef;
    using llvm::MutableArrayRef;
    using llvm::TinyPtrVector;
    using llvm::PointerUnion;
  
    // Other common classes.
    using llvm::raw_ostream;
    using llvm::APInt;
    using llvm::APFloat;
    using llvm::NoneType;
  } // end namespace swift
  
  #endif
  