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/*************************************************************************
*
* Copyright 2016 Realm Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**************************************************************************/
#ifndef REALM_OWNED_DATA_HPP
#define REALM_OWNED_DATA_HPP
#include <realm/util/assert.hpp>
#include <cstring>
#include <memory>
namespace realm {
/// A chunk of owned data.
class OwnedData {
public:
/// Construct a null reference.
OwnedData() noexcept
{
}
/// If \a data_to_copy is 'null', \a data_size must be zero.
OwnedData(const char* data_to_copy, size_t data_size)
: m_size(data_size)
{
REALM_ASSERT_DEBUG(data_to_copy || data_size == 0);
if (data_to_copy) {
m_data = std::unique_ptr<char[]>(new char[data_size]);
memcpy(m_data.get(), data_to_copy, data_size);
}
}
/// If \a unique_data is 'null', \a data_size must be zero.
OwnedData(std::unique_ptr<char[]> unique_data, size_t data_size) noexcept
: m_data(std::move(unique_data))
, m_size(data_size)
{
REALM_ASSERT_DEBUG(m_data || m_size == 0);
}
OwnedData(const OwnedData& other)
: OwnedData(other.m_data.get(), other.m_size)
{
}
OwnedData& operator=(const OwnedData& other);
OwnedData(OwnedData&&) = default;
OwnedData& operator=(OwnedData&&) = default;
const char* data() const
{
return m_data.get();
}
size_t size() const
{
return m_size;
}
private:
std::unique_ptr<char[]> m_data;
size_t m_size = 0;
};
inline OwnedData& OwnedData::operator=(const OwnedData& other)
{
if (this != &other) {
if (other.m_data) {
m_data = std::unique_ptr<char[]>(new char[other.m_size]);
memcpy(m_data.get(), other.m_data.get(), other.m_size);
}
else {
m_data = nullptr;
}
m_size = other.m_size;
}
return *this;
}
} // namespace realm
#endif // REALM_OWNED_DATA_HPP
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