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1 | // Boost integer/integer_mask.hpp header file ------------------------------// |
2 | ||
3 | // (C) Copyright Daryle Walker 2001. | |
4 | // Distributed under the Boost Software License, Version 1.0. (See | |
5 | // accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt) | |
7 | ||
8 | // See http://www.boost.org for updates, documentation, and revision history. | |
9 | ||
10 | #ifndef BOOST_INTEGER_INTEGER_MASK_HPP | |
11 | #define BOOST_INTEGER_INTEGER_MASK_HPP | |
12 | ||
13 | #include <boost/integer_fwd.hpp> // self include | |
14 | ||
15 | #include <boost/config.hpp> // for BOOST_STATIC_CONSTANT | |
16 | #include <boost/integer.hpp> // for boost::uint_t | |
17 | ||
18 | #include <climits> // for UCHAR_MAX, etc. | |
19 | #include <cstddef> // for std::size_t | |
20 | ||
21 | #include <boost/limits.hpp> // for std::numeric_limits | |
22 | ||
23 | // | |
24 | // We simply cannot include this header on gcc without getting copious warnings of the kind: | |
25 | // | |
26 | // boost/integer/integer_mask.hpp:93:35: warning: use of C99 long long integer constant | |
27 | // | |
28 | // And yet there is no other reasonable implementation, so we declare this a system header | |
29 | // to suppress these warnings. | |
30 | // | |
31 | #if defined(__GNUC__) && (__GNUC__ >= 4) | |
32 | #pragma GCC system_header | |
33 | #endif | |
34 | ||
35 | namespace boost | |
36 | { | |
37 | ||
38 | ||
39 | // Specified single-bit mask class declaration -----------------------------// | |
40 | // (Lowest bit starts counting at 0.) | |
41 | ||
42 | template < std::size_t Bit > | |
43 | struct high_bit_mask_t | |
44 | { | |
45 | typedef typename uint_t<(Bit + 1)>::least least; | |
46 | typedef typename uint_t<(Bit + 1)>::fast fast; | |
47 | ||
48 | BOOST_STATIC_CONSTANT( least, high_bit = (least( 1u ) << Bit) ); | |
49 | BOOST_STATIC_CONSTANT( fast, high_bit_fast = (fast( 1u ) << Bit) ); | |
50 | ||
51 | BOOST_STATIC_CONSTANT( std::size_t, bit_position = Bit ); | |
52 | ||
53 | }; // boost::high_bit_mask_t | |
54 | ||
55 | ||
56 | // Specified bit-block mask class declaration ------------------------------// | |
57 | // Makes masks for the lowest N bits | |
58 | // (Specializations are needed when N fills up a type.) | |
59 | ||
60 | template < std::size_t Bits > | |
61 | struct low_bits_mask_t | |
62 | { | |
63 | typedef typename uint_t<Bits>::least least; | |
64 | typedef typename uint_t<Bits>::fast fast; | |
65 | ||
66 | BOOST_STATIC_CONSTANT( least, sig_bits = (~( ~(least( 0u )) << Bits )) ); | |
67 | BOOST_STATIC_CONSTANT( fast, sig_bits_fast = fast(sig_bits) ); | |
68 | ||
69 | BOOST_STATIC_CONSTANT( std::size_t, bit_count = Bits ); | |
70 | ||
71 | }; // boost::low_bits_mask_t | |
72 | ||
73 | ||
74 | #define BOOST_LOW_BITS_MASK_SPECIALIZE( Type ) \ | |
75 | template < > struct low_bits_mask_t< std::numeric_limits<Type>::digits > { \ | |
76 | typedef std::numeric_limits<Type> limits_type; \ | |
77 | typedef uint_t<limits_type::digits>::least least; \ | |
78 | typedef uint_t<limits_type::digits>::fast fast; \ | |
79 | BOOST_STATIC_CONSTANT( least, sig_bits = (~( least(0u) )) ); \ | |
80 | BOOST_STATIC_CONSTANT( fast, sig_bits_fast = fast(sig_bits) ); \ | |
81 | BOOST_STATIC_CONSTANT( std::size_t, bit_count = limits_type::digits ); \ | |
82 | } | |
83 | ||
84 | #ifdef BOOST_MSVC | |
85 | #pragma warning(push) | |
86 | #pragma warning(disable:4245) // 'initializing' : conversion from 'int' to 'const boost::low_bits_mask_t<8>::least', signed/unsigned mismatch | |
87 | #endif | |
88 | ||
89 | BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned char ); | |
90 | ||
91 | #if USHRT_MAX > UCHAR_MAX | |
92 | BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned short ); | |
93 | #endif | |
94 | ||
95 | #if UINT_MAX > USHRT_MAX | |
96 | BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned int ); | |
97 | #endif | |
98 | ||
99 | #if ULONG_MAX > UINT_MAX | |
100 | BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned long ); | |
101 | #endif | |
102 | ||
103 | #if defined(BOOST_HAS_LONG_LONG) | |
104 | #if ((defined(ULLONG_MAX) && (ULLONG_MAX > ULONG_MAX)) ||\ | |
105 | (defined(ULONG_LONG_MAX) && (ULONG_LONG_MAX > ULONG_MAX)) ||\ | |
106 | (defined(ULONGLONG_MAX) && (ULONGLONG_MAX > ULONG_MAX)) ||\ | |
107 | (defined(_ULLONG_MAX) && (_ULLONG_MAX > ULONG_MAX))) | |
108 | BOOST_LOW_BITS_MASK_SPECIALIZE( boost::ulong_long_type ); | |
109 | #endif | |
110 | #elif defined(BOOST_HAS_MS_INT64) | |
111 | #if 18446744073709551615ui64 > ULONG_MAX | |
112 | BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned __int64 ); | |
113 | #endif | |
114 | #endif | |
115 | ||
116 | #ifdef BOOST_MSVC | |
117 | #pragma warning(pop) | |
118 | #endif | |
119 | ||
120 | #undef BOOST_LOW_BITS_MASK_SPECIALIZE | |
121 | ||
122 | ||
123 | } // namespace boost | |
124 | ||
125 | ||
126 | #endif // BOOST_INTEGER_INTEGER_MASK_HPP |