co-cpp19/src/array19.lib/array19/Array.h at develop · basicpp/co-cpp19 · GitHub

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#pragma once

#include "MoveSliceOf.h"

#include "SliceOf.h"

#include <stddef.h> // size_t

namespace array19 {

/// simplified version of std::array

/// * no member types

/// * no exceptions

template<class T, size_t C> struct Array {

using Element = T;

static constexpr auto count = C;

T m[count];

bool operator==(const Array&) const = default;

[[nodiscard]] constexpr auto isEmpty() const noexcept -> bool { return false; }

[[nodiscard]] constexpr auto begin() const noexcept -> const T* { return m; }

[[nodiscard]] constexpr auto end() const noexcept -> const T* { return m + C; }

[[nodiscard]] constexpr auto operator[](size_t i) const noexcept -> const T& { return m[i]; }

[[nodiscard]] constexpr operator SliceOf<const T>() const& noexcept { return SliceOf{m, C}; }

[[nodiscard]] constexpr auto move() noexcept -> MoveSliceOf<T> { return MoveSliceOf{m, C}; }

// hint: use `amendSliceOfArray()` if you need to iterate and mutate

[[nodiscard]] constexpr auto amendBegin() noexcept -> T* { return m; }

[[nodiscard]] constexpr auto amendEnd() noexcept -> T* { return m + C; }

[[nodiscard]] constexpr auto amend() noexcept -> SliceOf<T> { return SliceOf{m, C}; }

};

template<class T> struct Array<T, 0u> {

using Element = T;

static constexpr auto count = 0u;

bool operator==(const Array&) const = default;

[[nodiscard]] constexpr auto isEmpty() const noexcept -> bool { return true; }

[[nodiscard]] constexpr auto begin() const noexcept -> const T* { return nullptr; }

[[nodiscard]] constexpr auto end() const noexcept -> const T* { return nullptr; }

[[nodiscard]] constexpr operator SliceOf<const T>() const& noexcept { return SliceOf{begin(), 0u}; }

[[nodiscard]] constexpr auto move() noexcept -> MoveSliceOf<T> { return MoveSliceOf{amendBegin(), 0u}; }

// hint: use `amendSliceOfArray()` if you need to iterate and mutate

[[nodiscard]] constexpr auto amendBegin() noexcept -> T* { return nullptr; }

[[nodiscard]] constexpr auto amendEnd() noexcept -> T* { return nullptr; }

[[nodiscard]] constexpr auto amend() noexcept -> SliceOf<T> { return SliceOf{amendBegin(), 0u}; }

};

/// simplified deduction guide

/// * not checking that all types are the same

/// usage:

/// Array{1, 2, 3};

template<class T, class... Ts> Array(T, Ts...) -> Array<T, 1 + sizeof...(Ts)>;

} // namespace array19

co-cpp19/src/array19.lib/array19/Array.h at develop · basicpp/co-cpp19 · GitHub

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