CODEWITHSUNDEEP
c++c++20stdvectorstd-span
Martin Perry
Martin Perry

Reputation: 9527

Custom std::vector wrapper with view support

I have a large codebase that uses std::vector as data storage for numbers. However, now I need to add support for raw data views, due to external C library that returns raw array. Due to performance reasons, I dont want to copy data to std::vector.

I was thinking to use std::span from C++20 and create my own storage class like this:

template <typename T>
class DataStorage {
private:
   std::vector<T> data;

public:

   std::span<T> view;

   DataStorage(const std::vector<T>& d) : 
      data(d),
      view(data) {
   }

   DataStorage(T* d) : 
      data(),
      view(d) {
   }


   //other ctors
   //and methods
}

std::vector<int> vect{ 10, 20, 30 };
DataStorage<int> data(vect);
int value = data.view[1];

To read from data, view will be used. If data are passed via vector, DataStorage clas will own them. If I pass data via raw pointer (or with some flag), DataStorage will create only view. Is this a valid design?

Upvotes: 0

Views: 78

Answers (0)

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