TypeOrdering.h revision 2b9d973eb749aee6becbcf5e51ab5d49b828c978 
1//===-------------- TypeOrdering.h - Total ordering for types -------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10//  This file provides a function object that gives a total ordering
11//  on QualType values, so that they can be sorted, used in std::maps
12//  and std::sets, and so on.
13//
14//===----------------------------------------------------------------------===//
15
16#ifndef LLVM_CLANG_TYPE_ORDERING_H
17#define LLVM_CLANG_TYPE_ORDERING_H
18
19#include "clang/AST/Type.h"
20#include <functional>
21
22namespace clang {
23
24/// QualTypeOrdering - Function object that provides a total ordering
25/// on QualType values.
26struct QualTypeOrdering : std::binary_function<QualType, QualType, bool> {
27  bool operator()(QualType T1, QualType T2) const {
28    return std::less<void*>()(T1.getAsOpaquePtr(), T2.getAsOpaquePtr());
29  }
30};
31
32}
33
34#endif
35