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 //
 // detail/socket_option.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~
 //
 // Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // 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)
 //
 
 #ifndef BOOST_ASIO_DETAIL_SOCKET_OPTION_HPP
 #define BOOST_ASIO_DETAIL_SOCKET_OPTION_HPP
 
 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
 # pragma once
 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
 
 #include <boost/asio/detail/config.hpp>
 #include <cstddef>
 #include <stdexcept>
 #include <boost/asio/detail/socket_types.hpp>
 #include <boost/asio/detail/throw_exception.hpp>
 
 #include <boost/asio/detail/push_options.hpp>
 
 namespace boost {
 namespace asio {
 namespace detail {
 namespace socket_option {
 
 // Helper template for implementing boolean-based options.
 template <int Level, int Name>
 class boolean
 {
 public:
   // Default constructor.
   boolean()
     : value_(0)
   {
   }
 
   // Construct with a specific option value.
   explicit boolean(bool v)
     : value_(v ? 1 : 0)
   {
   }
 
   // Set the current value of the boolean.
   boolean& operator=(bool v)
   {
     value_ = v ? 1 : 0;
     return *this;
   }
 
   // Get the current value of the boolean.
   bool value() const
   {
     return !!value_;
   }
 
   // Convert to bool.
   operator bool() const
   {
     return !!value_;
   }
 
   // Test for false.
   bool operator!() const
   {
     return !value_;
   }
 
   // Get the level of the socket option.
   template <typename Protocol>
   int level(const Protocol&) const
   {
     return Level;
   }
 
   // Get the name of the socket option.
   template <typename Protocol>
   int name(const Protocol&) const
   {
     return Name;
   }
 
   // Get the address of the boolean data.
   template <typename Protocol>
   int* data(const Protocol&)
   {
     return &value_;
   }
 
   // Get the address of the boolean data.
   template <typename Protocol>
   const int* data(const Protocol&) const
   {
     return &value_;
   }
 
   // Get the size of the boolean data.
   template <typename Protocol>
   std::size_t size(const Protocol&) const
   {
     return sizeof(value_);
   }
 
   // Set the size of the boolean data.
   template <typename Protocol>
   void resize(const Protocol&, std::size_t s)
   {
     // On some platforms (e.g. Windows Vista), the getsockopt function will
     // return the size of a boolean socket option as one byte, even though a
     // four byte integer was passed in.
     switch (s)
     {
     case sizeof(char):
       value_ = *reinterpret_cast<char*>(&value_) ? 1 : 0;
       break;
     case sizeof(value_):
       break;
     default:
       {
         std::length_error ex("boolean socket option resize");
         boost::asio::detail::throw_exception(ex);
       }
     }
   }
 
 private:
   int value_;
 };
 
 // Helper template for implementing integer options.
 template <int Level, int Name>
 class integer
 {
 public:
   // Default constructor.
   integer()
     : value_(0)
   {
   }
 
   // Construct with a specific option value.
   explicit integer(int v)
     : value_(v)
   {
   }
 
   // Set the value of the int option.
   integer& operator=(int v)
   {
     value_ = v;
     return *this;
   }
 
   // Get the current value of the int option.
   int value() const
   {
     return value_;
   }
 
   // Get the level of the socket option.
   template <typename Protocol>
   int level(const Protocol&) const
   {
     return Level;
   }
 
   // Get the name of the socket option.
   template <typename Protocol>
   int name(const Protocol&) const
   {
     return Name;
   }
 
   // Get the address of the int data.
   template <typename Protocol>
   int* data(const Protocol&)
   {
     return &value_;
   }
 
   // Get the address of the int data.
   template <typename Protocol>
   const int* data(const Protocol&) const
   {
     return &value_;
   }
 
   // Get the size of the int data.
   template <typename Protocol>
   std::size_t size(const Protocol&) const
   {
     return sizeof(value_);
   }
 
   // Set the size of the int data.
   template <typename Protocol>
   void resize(const Protocol&, std::size_t s)
   {
     if (s != sizeof(value_))
     {
       std::length_error ex("integer socket option resize");
       boost::asio::detail::throw_exception(ex);
     }
   }
 
 private:
   int value_;
 };
 
 // Helper template for implementing linger options.
 template <int Level, int Name>
 class linger
 {
 public:
   // Default constructor.
   linger()
   {
     value_.l_onoff = 0;
     value_.l_linger = 0;
   }
 
   // Construct with specific option values.
   linger(bool e, int t)
   {
     enabled(e);
     timeout BOOST_ASIO_PREVENT_MACRO_SUBSTITUTION(t);
   }
 
   // Set the value for whether linger is enabled.
   void enabled(bool value)
   {
     value_.l_onoff = value ? 1 : 0;
   }
 
   // Get the value for whether linger is enabled.
   bool enabled() const
   {
     return value_.l_onoff != 0;
   }
 
   // Set the value for the linger timeout.
   void timeout BOOST_ASIO_PREVENT_MACRO_SUBSTITUTION(int value)
   {
 #if defined(WIN32)
     value_.l_linger = static_cast<u_short>(value);
 #else
     value_.l_linger = value;
 #endif
   }
 
   // Get the value for the linger timeout.
   int timeout BOOST_ASIO_PREVENT_MACRO_SUBSTITUTION() const
   {
     return static_cast<int>(value_.l_linger);
   }
 
   // Get the level of the socket option.
   template <typename Protocol>
   int level(const Protocol&) const
   {
     return Level;
   }
 
   // Get the name of the socket option.
   template <typename Protocol>
   int name(const Protocol&) const
   {
     return Name;
   }
 
   // Get the address of the linger data.
   template <typename Protocol>
   detail::linger_type* data(const Protocol&)
   {
     return &value_;
   }
 
   // Get the address of the linger data.
   template <typename Protocol>
   const detail::linger_type* data(const Protocol&) const
   {
     return &value_;
   }
 
   // Get the size of the linger data.
   template <typename Protocol>
   std::size_t size(const Protocol&) const
   {
     return sizeof(value_);
   }
 
   // Set the size of the int data.
   template <typename Protocol>
   void resize(const Protocol&, std::size_t s)
   {
     if (s != sizeof(value_))
     {
       std::length_error ex("linger socket option resize");
       boost::asio::detail::throw_exception(ex);
     }
   }
 
 private:
   detail::linger_type value_;
 };
 
 } // namespace socket_option
 } // namespace detail
 } // namespace asio
 } // namespace boost
 
 #include <boost/asio/detail/pop_options.hpp>
 
 #endif // BOOST_ASIO_DETAIL_SOCKET_OPTION_HPP

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