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145
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1 /* Descriptions of array-like objects.
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2 Copyright (C) 2019-2020 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef GCC_ARRAY_TRAITS_H
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21 #define GCC_ARRAY_TRAITS_H
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22
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23 /* Implementation for single integers (and similar types). */
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24 template<typename T, T zero = T (0)>
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25 struct scalar_array_traits
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26 {
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27 typedef T element_type;
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28 static const bool has_constant_size = true;
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29 static const size_t constant_size = 1;
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30 static const T *base (const T &x) { return &x; }
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31 static size_t size (const T &) { return 1; }
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32 };
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33
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34 template<typename T>
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35 struct array_traits : scalar_array_traits<T> {};
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36
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37 /* Implementation for arrays with a static size. */
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38 template<typename T, size_t N>
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39 struct array_traits<T[N]>
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40 {
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41 typedef T element_type;
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42 static const bool has_constant_size = true;
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43 static const size_t constant_size = N;
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44 static const T *base (const T (&x)[N]) { return x; }
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45 static size_t size (const T (&)[N]) { return N; }
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46 };
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47
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48 #endif
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