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- #ifndef BOOST_LOG_UTILITY_MANIPULATORS_OPTIONAL_HPP_INCLUDED_
- #define BOOST_LOG_UTILITY_MANIPULATORS_OPTIONAL_HPP_INCLUDED_
- #include <cstddef>
- #include <boost/core/enable_if.hpp>
- #include <boost/type_traits/is_array.hpp>
- #include <boost/type_traits/is_scalar.hpp>
- #include <boost/type_traits/conditional.hpp>
- #include <boost/log/detail/config.hpp>
- #include <boost/log/detail/is_ostream.hpp>
- #include <boost/log/detail/header.hpp>
- #ifdef BOOST_HAS_PRAGMA_ONCE
- #pragma once
- #endif
- namespace boost {
- BOOST_LOG_OPEN_NAMESPACE
- template< typename OptionalT, typename NoneT >
- class optional_manipulator
- {
- private:
- typedef typename conditional<
- is_scalar< OptionalT >::value,
- OptionalT,
- OptionalT const&
- >::type stored_optional_type;
- typedef typename conditional<
- is_scalar< NoneT >::value,
- NoneT,
- NoneT const&
- >::type stored_none_type;
- private:
- stored_optional_type m_optional;
- stored_none_type m_none;
- public:
-
- optional_manipulator(stored_optional_type opt, stored_none_type none) BOOST_NOEXCEPT :
- m_optional(opt),
- m_none(none)
- {
- }
-
- template< typename StreamT >
- void output(StreamT& stream) const
- {
- if (!!m_optional)
- stream << *m_optional;
- else
- stream << m_none;
- }
- };
- template< typename OptionalT >
- class optional_manipulator< OptionalT, void >
- {
- private:
- typedef typename conditional<
- is_scalar< OptionalT >::value,
- OptionalT,
- OptionalT const&
- >::type stored_optional_type;
- private:
- stored_optional_type m_optional;
- public:
-
- optional_manipulator(stored_optional_type opt) BOOST_NOEXCEPT :
- m_optional(opt)
- {
- }
-
- template< typename StreamT >
- void output(StreamT& stream) const
- {
- if (!!m_optional)
- stream << *m_optional;
- }
- };
- template< typename StreamT, typename OptionalT, typename NoneT >
- inline typename boost::enable_if_c< log::aux::is_ostream< StreamT >::value, StreamT& >::type operator<< (StreamT& strm, optional_manipulator< OptionalT, NoneT > const& manip)
- {
- manip.output(strm);
- return strm;
- }
- template< typename OptionalT, typename NoneT >
- inline typename boost::enable_if_c<
- is_scalar< OptionalT >::value && is_scalar< NoneT >::value,
- optional_manipulator< OptionalT, NoneT >
- >::type optional_manip(OptionalT opt, NoneT none) BOOST_NOEXCEPT
- {
- return optional_manipulator< OptionalT, NoneT >(opt, none);
- }
- template< typename OptionalT, typename NoneT >
- inline typename boost::enable_if_c<
- is_scalar< OptionalT >::value && !is_scalar< NoneT >::value,
- optional_manipulator< OptionalT, NoneT >
- >::type optional_manip(OptionalT opt, NoneT const& none) BOOST_NOEXCEPT
- {
- return optional_manipulator< OptionalT, NoneT >(opt, none);
- }
- template< typename OptionalT, typename NoneElementT, std::size_t N >
- inline typename boost::enable_if_c<
- is_scalar< OptionalT >::value,
- optional_manipulator< OptionalT, NoneElementT* >
- >::type optional_manip(OptionalT opt, NoneElementT (&none)[N]) BOOST_NOEXCEPT
- {
- return optional_manipulator< OptionalT, NoneElementT* >(opt, none);
- }
- template< typename OptionalT, typename NoneT >
- inline typename boost::enable_if_c<
- !is_scalar< OptionalT >::value && !is_array< OptionalT >::value && is_scalar< NoneT >::value,
- optional_manipulator< OptionalT, NoneT >
- >::type optional_manip(OptionalT const& opt, NoneT none) BOOST_NOEXCEPT
- {
- return optional_manipulator< OptionalT, NoneT >(opt, none);
- }
- template< typename OptionalT, typename NoneT >
- inline typename boost::enable_if_c<
- !is_scalar< OptionalT >::value && !is_array< OptionalT >::value && !is_scalar< NoneT >::value,
- optional_manipulator< OptionalT, NoneT >
- >::type optional_manip(OptionalT const& opt, NoneT const& none) BOOST_NOEXCEPT
- {
- return optional_manipulator< OptionalT, NoneT >(opt, none);
- }
- template< typename OptionalT, typename NoneElementT, std::size_t N >
- inline typename boost::enable_if_c<
- !is_scalar< OptionalT >::value && !is_array< OptionalT >::value,
- optional_manipulator< OptionalT, NoneElementT* >
- >::type optional_manip(OptionalT const& opt, NoneElementT (&none)[N]) BOOST_NOEXCEPT
- {
- return optional_manipulator< OptionalT, NoneElementT* >(opt, none);
- }
- template< typename OptionalT >
- inline typename boost::enable_if_c<
- is_scalar< OptionalT >::value,
- optional_manipulator< OptionalT, void >
- >::type optional_manip(OptionalT opt) BOOST_NOEXCEPT
- {
- return optional_manipulator< OptionalT, void >(opt);
- }
- template< typename OptionalT >
- inline typename boost::enable_if_c<
- !is_scalar< OptionalT >::value && !is_array< OptionalT >::value,
- optional_manipulator< OptionalT, void >
- >::type optional_manip(OptionalT const& opt) BOOST_NOEXCEPT
- {
- return optional_manipulator< OptionalT, void >(opt);
- }
- BOOST_LOG_CLOSE_NAMESPACE
- }
- #include <boost/log/detail/footer.hpp>
- #endif
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