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/*
* libfud
* Copyright 2024 Dominick Allen
*
* 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 FUD_SPAN_HPP
#define FUD_SPAN_HPP
#include <cstdlib>
#include "fud_array.hpp"
namespace fud {
template <typename T, size_t Size>
struct Span {
static_assert(Size > 0);
using ValueType = T;
static Span make(Array<T, Size>& array) {
Span<T, Size> output{};
output.m_data = array.data();
return output;
}
template <typename U>
static Span make(const Array<U, Size>& array) {
static_assert(std::convertible_to<U, T>);
Span<T, Size> output{};
output.m_data = array.data();
return output;
}
template <typename U>
static Span make(Array<U, Size>& array) {
static_assert(std::convertible_to<U, T>);
Span<T, Size> output{};
output.m_data = array.data();
return output;
}
template <size_t ArraySize>
static Span makeCStringBuffer(Array<T, ArraySize>& array) {
static_assert(ArraySize > Size);
Span<T, Size> output{};
output.m_data = array.data();
return output;
}
T* m_data;
[[nodiscard]] constexpr size_t size() const
{
return Size;
}
constexpr T& front()
{
return m_data[0];
}
constexpr const T& front() const
{
return m_data[0];
}
constexpr T& back()
{
return m_data[Size - 1];
}
constexpr const T& back() const
{
return m_data[Size - 1];
}
constexpr T* data() noexcept
{
return m_data;
}
constexpr const T* data() const noexcept
{
return m_data;
}
constexpr T* begin() noexcept
{
return m_data;
}
constexpr const T* begin() const noexcept
{
return m_data;
}
constexpr T* end() noexcept
{
return m_data + Size;
}
constexpr const T* end() const noexcept
{
return m_data + Size;
}
constexpr T& operator[](size_t index)
{
return m_data[index];
}
constexpr const T& operator[](size_t index) const
{
return m_data[index];
}
constexpr bool operator==(const Span<T, Size>&) const noexcept = default;
constexpr auto operator<=>(const Span<T, Size>& other) const noexcept = default;
};
} // namespace fud
#endif
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