1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 #ifndef SUPPORT_TYPE_ID_H
10 #define SUPPORT_TYPE_ID_H
11
12 #include <functional>
13 #include <typeinfo>
14 #include <string>
15 #include <cstdio>
16 #include <cassert>
17
18 #include "test_macros.h"
19 #include "demangle.h"
20
21 #if TEST_STD_VER < 11
22 #error This header requires C++11 or greater
23 #endif
24
25 // TypeID - Represent a unique identifier for a type. TypeID allows equality
26 // comparisons between different types.
27 struct TypeID {
28 friend bool operator==(TypeID const& LHS, TypeID const& RHS)
29 {return LHS.m_id == RHS.m_id; }
30 friend bool operator!=(TypeID const& LHS, TypeID const& RHS)
31 {return LHS.m_id != RHS.m_id; }
32
nameTypeID33 std::string name() const {
34 return demangle(m_id);
35 }
36
dumpTypeID37 void dump() const {
38 std::string s = name();
39 std::printf("TypeID: %s\n", s.c_str());
40 }
41
42 private:
TypeIDTypeID43 explicit constexpr TypeID(const char* xid) : m_id(xid) {}
44
45 TypeID(const TypeID&) = delete;
46 TypeID& operator=(TypeID const&) = delete;
47
48 const char* const m_id;
49 template <class T> friend TypeID const& makeTypeIDImp();
50 };
51
52 // makeTypeID - Return the TypeID for the specified type 'T'.
53 template <class T>
makeTypeIDImp()54 inline TypeID const& makeTypeIDImp() {
55 static const TypeID id(typeid(T).name());
56 return id;
57 }
58
59 template <class T>
60 struct TypeWrapper {};
61
62 template <class T>
makeTypeID()63 inline TypeID const& makeTypeID() {
64 return makeTypeIDImp<TypeWrapper<T>>();
65 }
66
67 template <class ...Args>
68 struct ArgumentListID {};
69
70 // makeArgumentID - Create and return a unique identifier for a given set
71 // of arguments.
72 template <class ...Args>
makeArgumentID()73 inline TypeID const& makeArgumentID() {
74 return makeTypeIDImp<ArgumentListID<Args...>>();
75 }
76
77
78 // COMPARE_TYPEID(...) is a utility macro for generating diagnostics when
79 // two typeid's are expected to be equal
80 #define COMPARE_TYPEID(LHS, RHS) CompareTypeIDVerbose(#LHS, LHS, #RHS, RHS)
81
CompareTypeIDVerbose(const char * LHSString,TypeID const * LHS,const char * RHSString,TypeID const * RHS)82 inline bool CompareTypeIDVerbose(const char* LHSString, TypeID const* LHS,
83 const char* RHSString, TypeID const* RHS) {
84 if (*LHS == *RHS)
85 return true;
86 std::printf("TypeID's not equal:\n");
87 std::printf("%s: %s\n----------\n%s: %s\n",
88 LHSString, LHS->name().c_str(),
89 RHSString, RHS->name().c_str());
90 return false;
91 }
92
93 #endif // SUPPORT_TYPE_ID_H
94