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fix span

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This commit is contained in:
Christoph Urlacher
2022-07-24 22:42:12 +02:00
parent 5833c07ae2
commit 5470992d31
1 changed files with 20 additions and 16 deletions
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36
c_os/user/lib/Span.h
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@ -7,44 +7,48 @@
namespace bse {
// 0 is unchecked
template<typename T, const std::size_t N = 0>
template<typename T, std::size_t N = 0>
class span {
public:
using iterator = ContinuousIterator<T>;
private:
const T* ptr;
T* ptr;
std::size_t sz = N;
public:
span() = default;
span(const T* first) : ptr(first) {}
span(T* first) : ptr(first) {}
span(const T* first, const T* last) : ptr(first), sz(last - first) {}
span(T* first, T* last) : ptr(first), sz(last - first) {}
iterator begin() { return iterator(&ptr[0]); }
iterator begin() const { return iterator(&ptr[0]); }
iterator begin() { return iterator(ptr); }
iterator begin() const { return iterator(ptr); }
// If size is unchecked end() is equal to begin()
iterator end() { return iterator(&ptr[N]); }
iterator end() const { return iterator(&ptr[N]); }
constexpr T& operator[](std::size_t i) {
if constexpr (N != 0 && i >= N) {
return nullptr;
T* operator[](std::size_t i) {
if constexpr (N != 0) {
if (i >= N) { return nullptr; }
}
return ptr[i];
return &ptr[i];
}
constexpr const T& operator[](std::size_t i) const {
if constexpr (N != 0 && i >= N) {
return nullptr;
const T* operator[](std::size_t i) const {
if constexpr (N != 0) {
if (i >= N) { return nullptr; }
}
return ptr[i];
return &ptr[i];
}
T* data() { return &ptr[0]; }
const T* data() const { return &ptr[0]; }
T* data() { return ptr; }
const T* data() const { return ptr; }
explicit operator T*() {
return ptr;
}
// First is inclusive, last exclusive [first, last)
span& subspan(std::size_t first, std::size_t last = N) {