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// Copyright (c) 2022, ARM Limited.
//
// 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 ARRAY_PROXY_H_
#define ARRAY_PROXY_H_
#include <cstddef>
#include <type_traits>
template <typename T>
class ArrayProxy
{
public:
ArrayProxy(size_t n, T* ptr) noexcept
: _n(n)
, _ptr(ptr)
{}
template <typename U = T, std::enable_if_t<std::is_const<U>::value, int> = 0>
ArrayProxy(size_t n, typename std::remove_const_t<T>* ptr) noexcept
: _n(n)
, _ptr(ptr)
{}
template <std::size_t S>
ArrayProxy(T (&ptr)[S]) noexcept
: _n(S)
, _ptr(ptr)
{}
template <std::size_t S, typename U = T, std::enable_if_t<std::is_const<U>::value, int> = 0>
ArrayProxy(typename std::remove_const_t<T> (&ptr)[S]) noexcept
: _n(S)
, _ptr(ptr)
{}
template <typename O,
std::enable_if_t<std::is_convertible_v<decltype(std::declval<O>().data()), T*> &&
std::is_convertible_v<decltype(std::declval<O>().size()), std::size_t>,
int> = 0>
ArrayProxy(O& obj) noexcept
: _n(obj.size())
, _ptr(obj.data())
{}
size_t size() const noexcept
{
return _n;
}
T* data() const noexcept
{
return _ptr;
}
bool empty() const noexcept
{
return _n == 0;
}
const T* begin() const noexcept
{
return _ptr;
}
const T* end() const noexcept
{
return _ptr + _n;
}
T& operator[](size_t idx) noexcept
{
return *(_ptr + idx);
}
const T& operator[](size_t idx) const noexcept
{
return *(_ptr + idx);
}
private:
size_t _n;
T* _ptr;
};
#endif // ARRAY_PROXY_H_
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