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#pragma once
#include "zerocopy.h"
#include "output.h"
/**
* @addtogroup Streams
* @{
*/
/**
* Null input stream. Does nothing, contains no data.
*/
class TNullInput: public IZeroCopyInput {
public:
TNullInput() noexcept;
~TNullInput() override;
private:
size_t DoRead(void* buf, size_t len) override;
size_t DoSkip(size_t len) override;
size_t DoNext(const void** ptr, size_t len) override;
};
/**
* Null output stream. Just ignores whatever is written into it.
*/
class TNullOutput: public IOutputStream {
public:
TNullOutput() noexcept;
~TNullOutput() override;
TNullOutput(TNullOutput&&) noexcept = default;
TNullOutput& operator=(TNullOutput&&) noexcept = default;
private:
void DoWrite(const void* buf, size_t len) override;
};
/**
* Null input-output stream.
*
* @see TNullInput
* @see TNullOutput
*/
class TNullIO: public TNullInput, public TNullOutput {
public:
TNullIO() noexcept;
~TNullIO() override;
};
namespace NPrivate {
TNullIO& StdNullStream() noexcept;
}
/**
* Standard null stream.
*/
#define Cnull (::NPrivate::StdNullStream())
/** @} */
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