API Usage

How do I use the API to write code for dealing with Bezier curves ?

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// Created On: Aug 15 2004
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#include 
#include 
#include "nbpoint.h"
#include "nbbezier.h"

void printTVal(NBBezier & bez, double tval);
void processBezierCurves();

int main() {
  processBezierCurves();
  return EXIT_SUCCESS;
}

void processBezierCurves() {
  NBPoint pt1(-5, 0);
  NBPoint pt2( 0, 5);
  NBPoint pt3(10, 0);

  VPOINT controlpts;
  controlpts.push_back( pt1 );
  controlpts.push_back( pt2 );
  controlpts.push_back( pt3 );

  NBBezier bez(controlpts);
  printTVal(bez, 0.25);
  printTVal(bez, 0.75);
  printTVal(bez, 0.99);
}

void printTVal(NBBezier & bez, double tval) {
  NBPoint res = bez.GetPoint(tval);
  std::cout << "t = " <<>
}