How to convert vector to array

Question

How do I convert a std::vector to a double array[]?

Answer 1

Vectors effectively are arrays under the skin. If you have a function:

void f( double a[]);

you can call it like this:

vector  v;
v.push_back( 1.23 )
f( &v[0] );

You should not ever need to convert a vector into an actual array instance.