blob: edd4e98ea6e7a920771fef6fa57be8961f77ff1d (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
#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)...)
{
}
};
|
