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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/alloc.h>
namespace mbus {
/**
* This class encapsulates a blob that is owned by the object. Objects
* of this class have destructive copy. Use Blob objects when you want
* to transfer the ownership of a blob, like when it is returned by a
* method.
**/
class Blob
{
using Alloc = vespalib::alloc::Alloc;
public:
/**
* Create a blob that will contain uninitialized memory with the
* given size.
*
* @param s size of the data to be created
**/
Blob(uint32_t s) :
_payload(Alloc::alloc(s)),
_sz(s)
{ }
Blob(Blob && rhs) noexcept :
_payload(std::move(rhs._payload)),
_sz(rhs._sz)
{
rhs._sz = 0;
}
Blob & operator = (Blob && rhs) noexcept {
swap(rhs);
return *this;
}
void swap(Blob & rhs) {
_payload.swap(rhs._payload);
std::swap(_sz, rhs._sz);
}
/**
* Obtain the data owned by this Blob
*
* @return data
**/
char *data() { return static_cast<char *>(_payload.get()); }
/**
* Obtain the data owned by this Blob
*
* @return data
**/
const char *data() const { return static_cast<const char *>(_payload.get()); }
Alloc & payload() { return _payload; }
const Alloc & payload() const { return _payload; }
size_t size() const { return _sz; }
private:
Alloc _payload;
size_t _sz;
};
} // namespace mbus
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