src/dawn/common/Numeric.h

// Copyright 2022 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 SRC_DAWN_COMMON_NUMERIC_H_
#define SRC_DAWN_COMMON_NUMERIC_H_

#include <cstdint>
#include <limits>
#include <type_traits>

#include "dawn/common/Assert.h"

namespace detail {

template <typename T>
inline constexpr uint32_t u32_sizeof() {
    static_assert(sizeof(T) <= std::numeric_limits<uint32_t>::max());
    return uint32_t(sizeof(T));
}

template <typename T>
inline constexpr uint32_t u32_alignof() {
    static_assert(alignof(T) <= std::numeric_limits<uint32_t>::max());
    return uint32_t(alignof(T));
}

}  // namespace detail

template <typename T>
inline constexpr uint32_t u32_sizeof = detail::u32_sizeof<T>();

template <typename T>
inline constexpr uint32_t u32_alignof = detail::u32_alignof<T>();

// Only defined for unsigned integers because that is all that is
// needed at the time of writing.
template <typename Dst, typename Src, typename = std::enable_if_t<std::is_unsigned_v<Src>>>
inline Dst checked_cast(const Src& value) {
    ASSERT(value <= std::numeric_limits<Dst>::max());
    return static_cast<Dst>(value);
}

#endif  // SRC_DAWN_COMMON_NUMERIC_H_