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first/last constructor working.

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Neil MacIntosh
2016-02-25 11:42:26 -08:00
parent d3929c59a0
commit cc22f2bf42
2 changed files with 45 additions and 80 deletions
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include/span.h
+18 -9
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@@ -96,13 +96,20 @@ public:
// [span.cons], span constructors, copy, assignment, and destructor
constexpr span() noexcept : data_(nullptr), size_(0)
{ static_assert(extent == dynamic_extent || extent == 0, "Cannot default initialize a fixed-length span."); }
constexpr span(nullptr_t) noexcept : span() {}
constexpr span(nullptr_t) noexcept : span()
{}
constexpr span(pointer ptr, index_type count) : data_(ptr), size_(count)
{ Expects((!ptr && count == 0) || (ptr && count >= 0)); }
#if 0 // TODO
constexpr span(pointer firstElem, pointer lastElem);
{ Expects(((!ptr && count == 0) || (ptr && count >= 0)) && (extent == dynamic_extent || extent == count)); }
constexpr span(pointer firstElem, pointer lastElem) : data_(firstElem), size_(std::distance(firstElem, lastElem))
{ Expects(size_ >= 0 && (extent == dynamic_extent || extent == size_)); }
template <size_t N>
constexpr span(element_type(&arr)[N]);
constexpr span(element_type(&arr)[N]) {}
#if 0 // TODO
template <size_t N>
constexpr span(array<remove_const_t<element_type>, N>& arr);
template <size_t N>
@@ -139,11 +146,13 @@ public:
constexpr index_type size_bytes() const noexcept { return size() * sizeof(element_type); }
constexpr bool empty() const noexcept { return size() == 0; }
#if 0 // TODO
// [span.elem], span element access
constexpr reference operator[](index_type idx) const;
constexpr reference operator()(index_type idx) const;
#endif
constexpr reference operator[](index_type idx) const
{
Expects(idx >= 0 && idx < size_);
return data_[idx];
}
constexpr reference operator()(index_type idx) const { return this->operator[](idx); }
constexpr pointer data() const noexcept { return data_; }
#if 0 // TODO
// [span.iter], span iterator support