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7c673cae FG |
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 | |
1e59de90 | 6 | // https://www.boost.org/LICENSE_1_0.txt) |
7c673cae | 7 | |
1e59de90 | 8 | // See https://www.boost.org for updates, documentation, and revision history. |
7c673cae FG |
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 | ||
b32b8144 FG |
60 | #ifdef BOOST_MSVC |
61 | #pragma warning(push) | |
62 | #pragma warning(disable:4310) // cast truncates constant value | |
63 | #endif | |
64 | ||
7c673cae FG |
65 | template < std::size_t Bits > |
66 | struct low_bits_mask_t | |
67 | { | |
68 | typedef typename uint_t<Bits>::least least; | |
69 | typedef typename uint_t<Bits>::fast fast; | |
70 | ||
b32b8144 | 71 | BOOST_STATIC_CONSTANT( least, sig_bits = least(~(least(~(least( 0u ))) << Bits )) ); |
7c673cae FG |
72 | BOOST_STATIC_CONSTANT( fast, sig_bits_fast = fast(sig_bits) ); |
73 | ||
74 | BOOST_STATIC_CONSTANT( std::size_t, bit_count = Bits ); | |
75 | ||
76 | }; // boost::low_bits_mask_t | |
77 | ||
b32b8144 FG |
78 | #ifdef BOOST_MSVC |
79 | #pragma warning(pop) | |
80 | #endif | |
7c673cae FG |
81 | |
82 | #define BOOST_LOW_BITS_MASK_SPECIALIZE( Type ) \ | |
83 | template < > struct low_bits_mask_t< std::numeric_limits<Type>::digits > { \ | |
84 | typedef std::numeric_limits<Type> limits_type; \ | |
85 | typedef uint_t<limits_type::digits>::least least; \ | |
86 | typedef uint_t<limits_type::digits>::fast fast; \ | |
87 | BOOST_STATIC_CONSTANT( least, sig_bits = (~( least(0u) )) ); \ | |
88 | BOOST_STATIC_CONSTANT( fast, sig_bits_fast = fast(sig_bits) ); \ | |
89 | BOOST_STATIC_CONSTANT( std::size_t, bit_count = limits_type::digits ); \ | |
90 | } | |
91 | ||
92 | #ifdef BOOST_MSVC | |
93 | #pragma warning(push) | |
94 | #pragma warning(disable:4245) // 'initializing' : conversion from 'int' to 'const boost::low_bits_mask_t<8>::least', signed/unsigned mismatch | |
95 | #endif | |
96 | ||
97 | BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned char ); | |
98 | ||
99 | #if USHRT_MAX > UCHAR_MAX | |
100 | BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned short ); | |
101 | #endif | |
102 | ||
103 | #if UINT_MAX > USHRT_MAX | |
104 | BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned int ); | |
105 | #endif | |
106 | ||
107 | #if ULONG_MAX > UINT_MAX | |
108 | BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned long ); | |
109 | #endif | |
110 | ||
111 | #if defined(BOOST_HAS_LONG_LONG) | |
112 | #if ((defined(ULLONG_MAX) && (ULLONG_MAX > ULONG_MAX)) ||\ | |
113 | (defined(ULONG_LONG_MAX) && (ULONG_LONG_MAX > ULONG_MAX)) ||\ | |
114 | (defined(ULONGLONG_MAX) && (ULONGLONG_MAX > ULONG_MAX)) ||\ | |
115 | (defined(_ULLONG_MAX) && (_ULLONG_MAX > ULONG_MAX))) | |
116 | BOOST_LOW_BITS_MASK_SPECIALIZE( boost::ulong_long_type ); | |
117 | #endif | |
118 | #elif defined(BOOST_HAS_MS_INT64) | |
119 | #if 18446744073709551615ui64 > ULONG_MAX | |
120 | BOOST_LOW_BITS_MASK_SPECIALIZE( unsigned __int64 ); | |
121 | #endif | |
122 | #endif | |
123 | ||
124 | #ifdef BOOST_MSVC | |
125 | #pragma warning(pop) | |
126 | #endif | |
127 | ||
128 | #undef BOOST_LOW_BITS_MASK_SPECIALIZE | |
129 | ||
130 | ||
131 | } // namespace boost | |
132 | ||
133 | ||
134 | #endif // BOOST_INTEGER_INTEGER_MASK_HPP |