include/boost/json /detail /ryu /detail /digit_table.hpp
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1   // Copyright 2018 Ulf Adams 1   // Copyright 2018 Ulf Adams
2   // 2   //
3   // The contents of this file may be used under the terms of the Apache License, 3   // The contents of this file may be used under the terms of the Apache License,
4   // Version 2.0. 4   // Version 2.0.
5   // 5   //
6   // (See accompanying file LICENSE-Apache or copy at 6   // (See accompanying file LICENSE-Apache or copy at
7   // http://www.apache.org/licenses/LICENSE-2.0) 7   // http://www.apache.org/licenses/LICENSE-2.0)
8   // 8   //
9   // Alternatively, the contents of this file may be used under the terms of 9   // Alternatively, the contents of this file may be used under the terms of
10   // the Boost Software License, Version 1.0. 10   // the Boost Software License, Version 1.0.
11   // (See accompanying file LICENSE-Boost or copy at 11   // (See accompanying file LICENSE-Boost or copy at
12   // https://www.boost.org/LICENSE_1_0.txt) 12   // https://www.boost.org/LICENSE_1_0.txt)
13   // 13   //
14   // Unless required by applicable law or agreed to in writing, this software 14   // Unless required by applicable law or agreed to in writing, this software
15   // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15   // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   // KIND, either express or implied. 16   // KIND, either express or implied.
17   17  
18   /* 18   /*
19   This is a derivative work 19   This is a derivative work
20   */ 20   */
21   21  
22   #ifndef BOOST_JSON_DETAIL_RYU_DETAIL_DIGIT_TABLE_HPP 22   #ifndef BOOST_JSON_DETAIL_RYU_DETAIL_DIGIT_TABLE_HPP
23   #define BOOST_JSON_DETAIL_RYU_DETAIL_DIGIT_TABLE_HPP 23   #define BOOST_JSON_DETAIL_RYU_DETAIL_DIGIT_TABLE_HPP
24   24  
25   #include <boost/json/detail/config.hpp> 25   #include <boost/json/detail/config.hpp>
26   26  
27   namespace boost { 27   namespace boost {
28   namespace json { 28   namespace json {
29   namespace detail { 29   namespace detail {
30   30  
31   namespace ryu { 31   namespace ryu {
32   namespace detail { 32   namespace detail {
33   33  
34   // A table of all two-digit numbers. This is used to speed up decimal digit 34   // A table of all two-digit numbers. This is used to speed up decimal digit
35   // generation by copying pairs of digits into the final output. 35   // generation by copying pairs of digits into the final output.
36   inline 36   inline
37   char const 37   char const
HITCBC 38   842 (&DIGIT_TABLE() noexcept)[200] 38   842 (&DIGIT_TABLE() noexcept)[200]
39   { 39   {
40   static constexpr char arr[200] = { 40   static constexpr char arr[200] = {
41   '0','0','0','1','0','2','0','3','0','4','0','5','0','6','0','7','0','8','0','9', 41   '0','0','0','1','0','2','0','3','0','4','0','5','0','6','0','7','0','8','0','9',
42   '1','0','1','1','1','2','1','3','1','4','1','5','1','6','1','7','1','8','1','9', 42   '1','0','1','1','1','2','1','3','1','4','1','5','1','6','1','7','1','8','1','9',
43   '2','0','2','1','2','2','2','3','2','4','2','5','2','6','2','7','2','8','2','9', 43   '2','0','2','1','2','2','2','3','2','4','2','5','2','6','2','7','2','8','2','9',
44   '3','0','3','1','3','2','3','3','3','4','3','5','3','6','3','7','3','8','3','9', 44   '3','0','3','1','3','2','3','3','3','4','3','5','3','6','3','7','3','8','3','9',
45   '4','0','4','1','4','2','4','3','4','4','4','5','4','6','4','7','4','8','4','9', 45   '4','0','4','1','4','2','4','3','4','4','4','5','4','6','4','7','4','8','4','9',
46   '5','0','5','1','5','2','5','3','5','4','5','5','5','6','5','7','5','8','5','9', 46   '5','0','5','1','5','2','5','3','5','4','5','5','5','6','5','7','5','8','5','9',
47   '6','0','6','1','6','2','6','3','6','4','6','5','6','6','6','7','6','8','6','9', 47   '6','0','6','1','6','2','6','3','6','4','6','5','6','6','6','7','6','8','6','9',
48   '7','0','7','1','7','2','7','3','7','4','7','5','7','6','7','7','7','8','7','9', 48   '7','0','7','1','7','2','7','3','7','4','7','5','7','6','7','7','7','8','7','9',
49   '8','0','8','1','8','2','8','3','8','4','8','5','8','6','8','7','8','8','8','9', 49   '8','0','8','1','8','2','8','3','8','4','8','5','8','6','8','7','8','8','8','9',
50   '9','0','9','1','9','2','9','3','9','4','9','5','9','6','9','7','9','8','9','9' }; 50   '9','0','9','1','9','2','9','3','9','4','9','5','9','6','9','7','9','8','9','9' };
HITCBC 51   842 return arr; 51   842 return arr;
52   } 52   }
53   53  
54   } // detail 54   } // detail
55   } // ryu 55   } // ryu
56   56  
57   } // detail 57   } // detail
58   } // namespace json 58   } // namespace json
59   } // namespace boost 59   } // namespace boost
60   60  
61   #endif 61   #endif