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/*
* Copyright 2020 The Android Open Source Project
*
* 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.
*/
#pragma once
#include <cstdint>
#include <type_traits>
namespace bluetooth {
namespace packet {
template <typename T>
class CustomFieldFixedSizeInterface {
public:
virtual ~CustomFieldFixedSizeInterface() = default;
// Get a pointer to a modifiable and readable continuous array of data
virtual uint8_t* data() = 0;
virtual const uint8_t* data() const = 0;
// Get the length of underlying data array, data() + length() would be invalid
// subclass T must have kLength variable defined
static constexpr size_t length() {
static_assert(
std::is_same_v<decltype(T::kLength), const size_t>, "T::kLength must be const size_t or constexpr size_t");
static_assert(std::is_const_v<decltype(T::kLength)>, "T::kLength must be const");
return T::kLength;
};
};
} // namespace packet
} // namespace bluetooth
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