DynamicSpan.h

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#pragma once
 
#include <cstddef>
 
namespace BaseLib
{
template <typename T>
struct DynamicSpan
{
    template <typename Iterator>
    DynamicSpan(Iterator data_, std::size_t size)
        : data{&*data_ /* manually convert iterator to pointer */}, size_{size}
    {
    }
 
    T* begin() const { return data; }
    T* end() const { return data + size_; }
    std::size_t size() const { return size_; }
    T& operator[](std::size_t i) const { return data[i]; }
 
    T* data;
 
private:
    std::size_t size_;
};
 
template <typename T>
DynamicSpan(T*, std::size_t) -> DynamicSpan<T>;
}  // namespace BaseLib