从已知大小的double *数组构造std :: vector <double>

Question

I have a pointer to the first element of a double array: double* p .

I also know the length of the array: n .

Is there a way I can copy this into a std::vector ? Preferably using a constructor and allocator. I'd like to do something like

std::vector<double> v = std::vector(p, n);

but can't figure out which constructor is closest to this. I'm using C++11.

Answer 1

std::vector<> has a constructor that takes a range. You can use it like this:

std::vector<double> v(p, p + n);

Answer 2

Try

std::vector<double> v( p, p + n );

Or if the vector was already defined then

v.assign( p, p + n );

If you want to append the vector then

v.insert( v.end(), p, p + n );