Green-Sky/solanaceae_util
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for span tweaking

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Green Sky 2024-03-31 15:42:05 +02:00
parent b82f039aaf
commit 17b4cce69b
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2 changed files with 25 additions and 1 deletions
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2
solanaceae/file/file2.hpp
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@ -20,6 +20,6 @@ struct File2I {
// pos -1 means stream, append to last written, or read position (independent, like FILE*s)
virtual bool write(const ByteSpan data, int64_t pos = -1) = 0;
virtual std::variant<ByteSpan, std::vector<uint8_t>> read(uint64_t size, int64_t pos = -1) = 0;
[[nodiscard]] virtual std::variant<ByteSpan, std::vector<uint8_t>> read(uint64_t size, int64_t pos = -1) = 0;
};

24
solanaceae/util/span.hpp
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@ -3,6 +3,7 @@
#include <cstdint>
#include <stdexcept>
#include <vector>
#include <array>
// non owning view
template<typename T>
@ -10,9 +11,21 @@ struct Span final {
const T* ptr {nullptr};
uint64_t size {0};
constexpr Span(const Span&) = default;
constexpr Span(Span&&) = default;
constexpr Span(void) {}
constexpr Span(const T* ptr_, uint64_t size_) : ptr(ptr_), size(size_) {}
constexpr Span(T* ptr_, uint64_t size_) : ptr(ptr_), size(size_) {}
constexpr explicit Span(const std::vector<T>& vec) : ptr(vec.data()), size(vec.size()) {}
constexpr explicit Span(std::vector<T>& vec) : ptr(vec.data()), size(vec.size()) {}
template<size_t N> constexpr explicit Span(const std::array<T, N>& arr) : ptr(arr.data()), size(arr.size()) {}
template<size_t N> constexpr explicit Span(std::array<T, N>& arr) : ptr(arr.data()), size(arr.size()) {}
Span& operator=(const Span& other) {
ptr = other.ptr;
size = other.size;
return *this;
}
explicit operator std::vector<T>() const {
return std::vector<T>{ptr, ptr+size};
@ -26,6 +39,16 @@ struct Span final {
return ptr[i];
}
#if 0
constexpr T& operator[](uint64_t i) {
if (i > size) {
throw std::out_of_range("accessed span out of range");
}
return ptr[i];
}
#endif
constexpr const T* cbegin(void) const { return ptr; }
constexpr const T* cend(void) const { return ptr+size; }
constexpr const T* begin(void) const { return ptr; }
@ -36,4 +59,5 @@ struct Span final {
// useful alias
using ByteSpan = Span<uint8_t>;
using ConstByteSpan = Span<const uint8_t>; // TODO: make use of?