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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef Collections_h | 5 #ifndef Collections_h |
6 #define Collections_h | 6 #define Collections_h |
7 | 7 |
8 #include <cstddef> | 8 #include <cstddef> |
9 | 9 |
10 #if defined(__APPLE__) && !defined(_LIBCPP_VERSION) | 10 #if defined(__APPLE__) && !defined(_LIBCPP_VERSION) |
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37 | 37 |
38 // Macro that returns a compile time constant with the length of an array, but g
ives an error if passed a non-array. | 38 // Macro that returns a compile time constant with the length of an array, but g
ives an error if passed a non-array. |
39 template<typename T, std::size_t Size> char (&ArrayLengthHelperFunction(T (&)[Si
ze]))[Size]; | 39 template<typename T, std::size_t Size> char (&ArrayLengthHelperFunction(T (&)[Si
ze]))[Size]; |
40 // GCC needs some help to deduce a 0 length array. | 40 // GCC needs some help to deduce a 0 length array. |
41 #if defined(__GNUC__) | 41 #if defined(__GNUC__) |
42 template<typename T> char (&ArrayLengthHelperFunction(T (&)[0]))[0]; | 42 template<typename T> char (&ArrayLengthHelperFunction(T (&)[0]))[0]; |
43 #endif | 43 #endif |
44 #define PROTOCOL_ARRAY_LENGTH(array) sizeof(::ArrayLengthHelperFunction(array)) | 44 #define PROTOCOL_ARRAY_LENGTH(array) sizeof(::ArrayLengthHelperFunction(array)) |
45 | 45 |
46 #endif // !defined(Collections_h) | 46 #endif // !defined(Collections_h) |
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