ptr_adaptor.hpp

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#ifndef SILICIUM_PTR_ADAPTOR_HPP
#define SILICIUM_PTR_ADAPTOR_HPP

#include <silicium/config.hpp>
#include <boost/version.hpp>
#if BOOST_VERSION >= 105500
#   include <boost/utility/explicit_operator_bool.hpp>
#endif

namespace Si
{
    template <class Pointee>
    struct ptr_adaptor
    {
        template <class ...Args>
        explicit ptr_adaptor(Args &&...args)
            : m_value(std::forward<Args>(args)...)
        {
        }

        Pointee &operator *() BOOST_NOEXCEPT
        {
            return m_value;
        }

        Pointee *operator ->() BOOST_NOEXCEPT
        {
            return &m_value;
        }

        bool operator !() const BOOST_NOEXCEPT
        {
            return false;
        }

#ifdef BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT
        //the noexcept version was added in 1.56 http://www.boost.org/doc/libs/1_57_0/libs/core/doc/html/core/explicit_operator_bool.html
        BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT()
#elif defined(BOOST_EXPLICIT_OPERATOR_BOOL)
        BOOST_EXPLICIT_OPERATOR_BOOL()
#else
        operator bool() const BOOST_NOEXCEPT
        {
            return true;
        }
#endif

#if !SILICIUM_COMPILER_GENERATES_MOVES
        ptr_adaptor(ptr_adaptor &&other)
            : m_value(std::move(other.m_value))
        {
        }

        ptr_adaptor &operator = (ptr_adaptor &&other)
        {
            m_value = std::move(other.m_value);
            return *this;
        }
#endif

    private:

        Pointee m_value;
    };

    template <class Pointee>
    auto make_ptr_adaptor(Pointee &&value)
#if !SILICIUM_COMPILER_HAS_AUTO_RETURN_TYPE
        ->ptr_adaptor<typename std::decay<Pointee>::type>
#endif
    {
        return ptr_adaptor<typename std::decay<Pointee>::type>(std::forward<Pointee>(value));
    }
}

#endif