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//
 
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// Copyright (c) 2026 Steve Gerbino
 
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//
 
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
 
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
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//
 
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// Official repository: https://github.com/cppalliance/corosio
 
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//
 
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/** @file native_tcp.hpp
 
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    Inline TCP protocol type using platform-specific constants.
 
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    All methods are `constexpr` or trivially inlined, giving zero
 
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    overhead compared to hand-written socket creation calls.
 
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    This header includes platform socket headers
 
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    (`<sys/socket.h>`, `<netinet/in.h>`, etc.).
 
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    For a version that avoids platform includes, use
 
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    `<boost/corosio/tcp.hpp>` (`boost::corosio::tcp`).
 
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    Both variants satisfy the same protocol-type interface and work
 
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    interchangeably with `tcp_socket::open` / `tcp_acceptor::open`.
 
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    @see boost::corosio::tcp
 
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*/
 
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#ifndef BOOST_COROSIO_NATIVE_NATIVE_TCP_HPP
 
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#define BOOST_COROSIO_NATIVE_NATIVE_TCP_HPP
 
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#ifdef _WIN32
 
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#include <winsock2.h>
 
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#include <ws2tcpip.h>
 
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#else
 
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#include <netinet/in.h>
 
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#include <sys/socket.h>
 
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#endif
 
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namespace boost::corosio {
 
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class tcp_socket;
 
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class tcp_acceptor;
 
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} // namespace boost::corosio
 
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namespace boost::corosio {
 
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/** Inline TCP protocol type with platform constants.
 
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    Same shape as @ref boost::corosio::tcp but with inline
 
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    `family()`, `type()`, and `protocol()` methods that
 
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    resolve to compile-time constants.
 
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    @see boost::corosio::tcp
 
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*/
 
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class native_tcp
 
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{
 
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    bool v6_;
 
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    explicit constexpr native_tcp( bool v6 ) noexcept : v6_( v6 ) {}
 
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public:
 
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    /// Construct an IPv4 TCP protocol.
 
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    static constexpr native_tcp v4() noexcept { return native_tcp( false ); }
 
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    /// Construct an IPv6 TCP protocol.
 
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    static constexpr native_tcp v6() noexcept { return native_tcp( true ); }
 
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    /// Return true if this is IPv6.
 
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    constexpr bool is_v6() const noexcept { return v6_; }
 
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    /// Return the address family (AF_INET or AF_INET6).
 
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    int family() const noexcept
 
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    {
 
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        return v6_ ? AF_INET6 : AF_INET;
 
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    }
 
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    /// Return the socket type (SOCK_STREAM).
 
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    static constexpr int type() noexcept { return SOCK_STREAM; }
 
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    /// Return the IP protocol (IPPROTO_TCP).
 
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    static constexpr int protocol() noexcept { return IPPROTO_TCP; }
 
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    /// The associated socket type.
 
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    using socket = tcp_socket;
 
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    /// The associated acceptor type.
 
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    using acceptor = tcp_acceptor;
 
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    friend constexpr bool operator==( native_tcp a, native_tcp b ) noexcept
 
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    {
 
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        return a.v6_ == b.v6_;
 
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    }
 
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    friend constexpr bool operator!=( native_tcp a, native_tcp b ) noexcept
 
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    {
 
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        return a.v6_ != b.v6_;
 
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    }
 
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};
 
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} // namespace boost::corosio
 
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#endif // BOOST_COROSIO_NATIVE_NATIVE_TCP_HPP