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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "input.h"
#include "output.h"
#include <vespa/vespalib/stllike/allocator.h>
#include <iosfwd>
#include <vector>
namespace vespalib {
/**
* Simple buffer class that implements the Input/Output
* interfaces. Requesting the memory region of this buffer or
* comparing buffers will only look at the data conceptually contained
* in the buffer, ignoring evicted data and reserved data not yet
* committed.
**/
class SimpleBuffer : public Input,
public Output
{
private:
std::vector<char, allocator_large<char>> _data;
size_t _used;
public:
SimpleBuffer();
~SimpleBuffer();
Memory obtain() override;
Input &evict(size_t bytes) override;
WritableMemory reserve(size_t bytes) override;
Output &commit(size_t bytes) override;
SimpleBuffer &add(char c) {
_data.push_back(c);
++_used;
return *this;
}
Memory get() const { return Memory(_data.data(), _used); }
bool operator==(const SimpleBuffer &rhs) const { return (get() == rhs.get()); }
};
std::ostream &operator<<(std::ostream &os, const SimpleBuffer &buf);
} // namespace vespalib
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