ostream_containers.hpp

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//    OpenVPN -- An application to securely tunnel IP networks
//               over a single port, with support for SSL/TLS-based
//               session authentication and key exchange,
//               packet encryption, packet authentication, and
//               packet compression.
//
//    Copyright (C) 2022- OpenVPN Inc.
//
//    SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
 
 
#pragma once
 
#include <ostream>
 
namespace openvpn::C2os {
 
template <typename C>
struct Container
{
    explicit Container(const C &container)
        : ref(container)
    {
    }
    const C &ref;
};
 
template <typename C>
inline const auto cast(const C &container)
{
    return Container<C>(container);
}
 
template <typename C>
inline std::ostream &operator<<(std::ostream &os, const Container<C> &container)
{
    constexpr char separator[] = ", ";
    const char *delimiter = "";
    os << "[";
    for (const auto &e : container.ref)
    {
        os << delimiter << e;
        delimiter = separator;
    }
    os << "]";
    return os;
}
 
template <typename C>
struct PtrContainer : Container<C>
{
    using Container<C>::Container;
};
 
template <typename C>
inline const auto cast_deref(const C &container)
{
    return PtrContainer<C>(container);
}
 
template <typename C>
inline std::ostream &operator<<(std::ostream &os, const PtrContainer<C> &container)
{
    constexpr char separator[] = ", ";
    const char *delimiter = "";
    os << "[";
    for (const auto &e : container.ref)
    {
        os << delimiter << *e;
        delimiter = separator;
    }
    os << "]";
    return os;
}
 
} // namespace openvpn::C2os