How to Convert a std::vector to a Double Array?

How to Convert a std::vector to a Double Array[]?

When working with vectors, there may come a time when you need to convert them to a double array[] to suit your programming needs. To achieve this, you can employ a simple method that has been made possible by recent updates to the C standard.

The upgrade ensures that vectors store their elements contiguously, meaning that vector memory is occupied in an unbroken sequence. This allows us to leverage a neat trick:

std::vector<double> v;
double* a = &v[0];

By assigning the address of the first vector element to a double pointer, you effectively create a double array that points to the same underlying data as the vector. This conversion technique saves you the hassle of manual copying and ensures data consistency.

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