| 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 |