to_string.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) 2012- OpenVPN Inc.
//
//    SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
 
#ifndef OPENVPN_COMMON_TO_STRING_H
#define OPENVPN_COMMON_TO_STRING_H
 
#include <string>
#include <sstream>
#include <type_traits>
 
#include <openvpn/common/platform.hpp>
 
/* This file provides an openvpn::to_string function that works for all
   types where either std::to_string is available or the type can be
   streamed to an std::ostringstream. This is useful for types that don't
   have a std::to_string overload. Also useful in cases where std::to_string
   support is not complete.
*/
 
namespace openvpn {
 
// Use std::to_string where we can
using std::to_string;
 
template <typename T>
    requires(!requires(T a) { std::to_string(a); })
            && requires(std::ostream &os, const T &t) { os << t; }
inline std::string to_string(const T &t)
{
    std::ostringstream os;
    os << t;
    return os.str();
}
 
} // namespace openvpn
 
#endif