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#pragma once
#include <util/generic/ptr.h>
#include <utility>
#include <type_traits>
class IInputStream;
class IOutputStream;
namespace NPrivate {
template <class Stream, bool isInput = std::is_base_of<IInputStream, Stream>::value>
struct TStreamBase {
using TType = IInputStream;
};
template <class Stream>
struct TStreamBase<Stream, false> {
using TType = IOutputStream;
};
}
/**
* An ownership-gaining wrapper for proxy streams.
*
* Example usage:
* \code
* TCountingInput* input = new THoldingStream<TCountingInput>(new TStringInput(s));
* \encode
*
* In this example, resulting counting input also owns a string input that it
* was constructed on top of.
*/
template <class Base, class StreamBase = typename ::NPrivate::TStreamBase<Base>::TType>
class THoldingStream: private THolder<StreamBase>, public Base {
public:
template <class... Args>
inline THoldingStream(THolder<StreamBase> stream, Args&&... args)
: THolder<StreamBase>(std::move(stream))
, Base(this->Get(), std::forward<Args>(args)...)
{
}
};
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