gcc/array-traits.h

   1 /* Descriptions of array-like objects.
   2    Copyright (C) 2019-2021 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_ARRAY_TRAITS_H
  21 #define GCC_ARRAY_TRAITS_H
  22
  23 /* Implementation for single integers (and similar types).  */
  24 template<typename T, T zero = T (0)>
  25 struct scalar_array_traits
  26 {
  27   typedef T element_type;
  28   static const bool has_constant_size = true;
  29   static const size_t constant_size = 1;
  30   static const T *base (const T &x) { return &x; }
  31   static size_t size (const T &) { return 1; }
  32 };
  33
  34 template<typename T>
  35 struct array_traits : scalar_array_traits<T> {};
  36
  37 /* Implementation for arrays with a static size.  */
  38 template<typename T, size_t N>
  39 struct array_traits<T[N]>
  40 {
  41   typedef T element_type;
  42   static const bool has_constant_size = true;
  43   static const size_t constant_size = N;
  44   static const T *base (const T (&x)[N]) { return x; }
  45   static size_t size (const T (&)[N]) { return N; }
  46 };
  47
  48 #endif