84 lines
2.1 KiB
C++
84 lines
2.1 KiB
C++
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// Copyright 2020 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <exception>
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#include <iterator>
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#include <limits>
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#include <memory>
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#include <optional>
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#include <type_traits>
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#include <utility>
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#include <vector>
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#define VK_NO_PROTOTYPES
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#include <vulkan/vulkan.h>
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#include "common/common_types.h"
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namespace Vulkan::vk {
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/**
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* Span for Vulkan arrays.
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* Based on std::span but optimized for array access instead of iterators.
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* Size returns uint32_t instead of size_t to ease interaction with Vulkan functions.
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*/
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template <typename T>
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class Span {
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public:
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/// Construct an empty span.
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constexpr Span() noexcept = default;
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/// Construct a span from a single element.
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constexpr Span(const T& value) noexcept : ptr{&value}, num{1} {}
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/// Construct a span from a range.
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template <typename Range>
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// requires std::data(const Range&)
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// requires std::size(const Range&)
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constexpr Span(const Range& range) : ptr{std::data(range)}, num{std::size(range)} {}
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/// Construct a span from a pointer and a size.
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/// This is inteded for subranges.
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constexpr Span(const T* ptr, std::size_t num) noexcept : ptr{ptr}, num{num} {}
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/// Returns the data pointer by the span.
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constexpr const T* data() const noexcept {
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return ptr;
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}
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/// Returns the number of elements in the span.
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constexpr u32 size() const noexcept {
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return static_cast<u32>(num);
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}
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/// Returns true when the span is empty.
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constexpr bool empty() const noexcept {
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return num == 0;
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}
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/// Returns a reference to the element in the passed index.
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/// @pre: index < size()
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constexpr const T& operator[](std::size_t index) const noexcept {
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return ptr[index];
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}
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/// Returns an iterator to the beginning of the span.
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constexpr const T* begin() const noexcept {
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return ptr;
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}
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/// Returns an iterator to the end of the span.
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constexpr const T* end() const noexcept {
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return ptr + num;
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}
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private:
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const T* ptr = nullptr;
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std::size_t num = 0;
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};
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} // namespace Vulkan::vk
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