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Diffstat (limited to 'boost/log/utility/functional/in_range.hpp')
-rw-r--r-- | boost/log/utility/functional/in_range.hpp | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/boost/log/utility/functional/in_range.hpp b/boost/log/utility/functional/in_range.hpp new file mode 100644 index 0000000000..3fe808a74a --- /dev/null +++ b/boost/log/utility/functional/in_range.hpp @@ -0,0 +1,63 @@ +/* + * Copyright Andrey Semashev 2007 - 2014. + * Distributed under the Boost Software License, Version 1.0. + * (See accompanying file LICENSE_1_0.txt or copy at + * http://www.boost.org/LICENSE_1_0.txt) + */ +/*! + * \file in_range.hpp + * \author Andrey Semashev + * \date 30.03.2008 + * + * This header contains a predicate for checking if the provided value is within a half-open range. + */ + +#ifndef BOOST_LOG_UTILITY_FUNCTIONAL_IN_RANGE_HPP_INCLUDED_ +#define BOOST_LOG_UTILITY_FUNCTIONAL_IN_RANGE_HPP_INCLUDED_ + +#include <utility> +#include <boost/log/detail/config.hpp> +#include <boost/log/utility/functional/logical.hpp> // make_common_integral_type +#include <boost/log/detail/header.hpp> + +#ifdef BOOST_HAS_PRAGMA_ONCE +#pragma once +#endif + +namespace boost { + +BOOST_LOG_OPEN_NAMESPACE + +//! The in_range functor +struct in_range_fun +{ + typedef bool result_type; + + template< typename T, typename U > + bool operator() (T const& value, std::pair< U, U > const& rng) const + { + return op(value, rng, typename mpl::and_< is_integral< T >, is_integral< U > >::type()); + } + +private: + template< typename T, typename U > + static bool op(T const& value, std::pair< U, U > const& rng, mpl::false_ const&) + { + return (value >= rng.first && value < rng.second); + } + template< typename T, typename U > + static bool op(T const& value, std::pair< U, U > const& rng, mpl::true_ const&) + { + typedef typename aux::make_common_integral_type< T, U >::type common_integral_type; + return (static_cast< common_integral_type >(value) >= static_cast< common_integral_type >(rng.first)) + && (static_cast< common_integral_type >(value) < static_cast< common_integral_type >(rng.second)); + } +}; + +BOOST_LOG_CLOSE_NAMESPACE // namespace log + +} // namespace boost + +#include <boost/log/detail/footer.hpp> + +#endif // BOOST_LOG_UTILITY_FUNCTIONAL_IN_RANGE_HPP_INCLUDED_ |