1 | /* |
---|---|
2 | * Copyright Andrey Semashev 2016. |
3 | * Distributed under the Boost Software License, Version 1.0. |
4 | * (See accompanying file LICENSE_1_0.txt or copy at |
5 | * http://www.boost.org/LICENSE_1_0.txt) |
6 | */ |
7 | /*! |
8 | * \file bit_tools.hpp |
9 | * \author Andrey Semashev |
10 | * \date 16.01.2016 |
11 | * |
12 | * \brief This header is the Boost.Log library implementation, see the library documentation |
13 | * at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html. |
14 | */ |
15 | |
16 | #ifndef BOOST_LOG_BIT_TOOLS_HPP_INCLUDED_ |
17 | #define BOOST_LOG_BIT_TOOLS_HPP_INCLUDED_ |
18 | |
19 | #include <boost/log/detail/config.hpp> |
20 | #include <cstddef> |
21 | #include <boost/cstdint.hpp> |
22 | #include <boost/log/detail/header.hpp> |
23 | |
24 | namespace boost { |
25 | |
26 | BOOST_LOG_OPEN_NAMESPACE |
27 | |
28 | namespace aux { |
29 | |
30 | //! Checks that the integer is a power of 2. |
31 | template< typename T > |
32 | inline BOOST_CONSTEXPR bool is_power_of_2(T n) BOOST_NOEXCEPT |
33 | { |
34 | return n != (T)0 && (n & (n - (T)1)) == (T)0; |
35 | } |
36 | |
37 | //! Returns an integer comprising the four characters |
38 | inline BOOST_CONSTEXPR uint32_t make_fourcc(unsigned char c1, unsigned char c2, unsigned char c3, unsigned char c4) BOOST_NOEXCEPT |
39 | { |
40 | return (static_cast< uint32_t >(c1) << 24) | (static_cast< uint32_t >(c2) << 16) | (static_cast< uint32_t >(c3) << 8) | static_cast< uint32_t >(c4); |
41 | } |
42 | |
43 | } // namespace aux |
44 | |
45 | BOOST_LOG_CLOSE_NAMESPACE // namespace log |
46 | |
47 | } // namespace boost |
48 | |
49 | #include <boost/log/detail/footer.hpp> |
50 | |
51 | #endif // BOOST_LOG_BIT_TOOLS_HPP_INCLUDED_ |
52 |