1 /*
2  * Copyright 2019 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <array>
20 
21 #include "packet/bit_inserter.h"
22 #include "packet/iterator.h"
23 
24 namespace bluetooth {
25 namespace packet {
26 // Checks a custom type has all the necessary functions with the correct signatures.
27 template <typename T, bool packet_little_endian>
28 class CustomTypeChecker {
29  public:
30   template <class C, void (C::*)(BitInserter&) const>
31   struct SerializeChecker {};
32 
33   template <class C, size_t (C::*)() const>
34   struct SizeChecker {};
35 
36   template <class C, bool little_endian, std::optional<Iterator<little_endian>> (*)(C* vec, Iterator<little_endian> it)>
37   struct ParseChecker {};
38 
39   template <class C, std::string (C::*)() const>
40   struct ToStringChecker {};
41 
42   template <class C, bool little_endian>
43   static int Test(SerializeChecker<C, &C::Serialize>*, SizeChecker<C, &C::size>*,
44                   ParseChecker<C, little_endian, &C::Parse>*, ToStringChecker<C, &C::ToString>*);
45 
46   template <class C, bool little_endian>
47   static char Test(...);
48 
49   static constexpr bool value = (sizeof(Test<T, packet_little_endian>(0, 0, 0, 0)) == sizeof(int));
50 };
51 }  // namespace packet
52 }  // namespace bluetooth
53