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// Copyright 2020 The Dawn Authors
//
// 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 COMMON_ITYP_ARRAY_H_
#define COMMON_ITYP_ARRAY_H_
#include "common/TypedInteger.h"
#include "common/UnderlyingType.h"
#include <array>
#include <type_traits>
namespace ityp {
// ityp::array is a helper class that wraps std::array with the restriction that
// indices must be a particular type |Index|. Dawn uses multiple flat maps of
// index-->data, and this class helps ensure an indices cannot be passed interchangably
// to a flat map of a different type.
template <typename Index, typename Value, size_t Size>
class array : private std::array<Value, Size> {
using I = UnderlyingType<Index>;
using Base = std::array<Value, Size>;
static_assert(Size <= std::numeric_limits<I>::max(), "");
public:
constexpr array() = default;
template <typename... Values>
constexpr array(Values&&... values) : Base{std::forward<Values>(values)...} {
}
Value& operator[](Index i) {
I index = static_cast<I>(i);
ASSERT(index >= 0 && index < Size);
return Base::operator[](index);
}
constexpr const Value& operator[](Index i) const {
I index = static_cast<I>(i);
ASSERT(index >= 0 && index < Size);
return Base::operator[](index);
}
Value& at(Index i) {
I index = static_cast<I>(i);
ASSERT(index >= 0 && index < Size);
return Base::at(index);
}
constexpr const Value& at(Index i) const {
I index = static_cast<I>(i);
ASSERT(index >= 0 && index < Size);
return Base::at(index);
}
typename Base::iterator begin() noexcept {
return Base::begin();
}
typename Base::const_iterator begin() const noexcept {
return Base::begin();
}
typename Base::iterator end() noexcept {
return Base::end();
}
typename Base::const_iterator end() const noexcept {
return Base::end();
}
constexpr Index size() const {
return Index(static_cast<I>(Size));
}
using Base::back;
using Base::data;
using Base::empty;
using Base::fill;
using Base::front;
};
} // namespace ityp
#endif // COMMON_ITYP_ARRAY_H_