> Hi all,
>
> I'd like to create a NaturalCubicSpline object and use it
> outside the function in which it is generated.
> I build the spline populating the array of x values and the array
> of y values, and passing the reference to their first and last elements
> into the constructor of NaturalCubicSpline.
> The problem that i notice is that if i pass the NaturalCubicSpline
> generated to another routine, but i let the arrays with the x and y values
> go out of scope, the program fails with an assertion error: Expression:
> vector iterator not dereferencable.
>
> I think that this is simply the way it is: the constructor
> copies the begin and end of the vectors but doesn't perform a copy of the
> vectors, so if I want to persist the spline, i should package a struct{}
> that contais the spline with the two vectors.
>
> Is this the case? Or is there another way to construct the spline so that
> i can treat it as an object on its own?
>
> Thanks,
> gc
>
> P.S. I'm adding a snipped of code that reproduce the error i'm receiving
>
>
> #include <ql/quantlib.hpp>
> #include <boost/shared_ptr.hpp>
> #include <iostream>
>
>
>
> int _tmain(int argc, _TCHAR* argv[])
> {
> boost::shared_ptr<QuantLib::NaturalCubicSpline> curve2;
> {
> std::vector<double> x;
> std::vector<double> y;
>
> x.push_back(1);
> y.push_back(10);
> x.push_back(2);
> y.push_back(7);
> x.push_back(3);
> y.push_back(2);
>
> boost::shared_ptr<QuantLib::NaturalCubicSpline> curve
> (new QuantLib::NaturalCubicSpline( x.begin(), x.end(), y.begin() ) );
> curve2 = curve;
> }
>
> for ( double i = 1; i<= 8; i+= 0.25 ) {
> std::cout << i << "\t" << curve2->operator ()( i, true )
> << std::endl;
> }
> return 0;
> }
>
>
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