example from cassowary-js

beer.cpp

#include "kiwi/kiwi.h"
#include <ostream>

int main() {
  kiwi::Variable ale  = kiwi::Variable("ale");
  kiwi::Variable beer = kiwi::Variable("beer");
  kiwi::Variable profit = kiwi::Variable("profit");
  kiwi::Variable corn = kiwi::Variable("corn");
  kiwi::Variable hops = kiwi::Variable("hops");
  kiwi::Variable malt = kiwi::Variable("malt");
  
  kiwi::Constraint cns[] = {
    13.0 * ale + 23.0 * beer == profit,
    (5 * ale) + (15 * beer) <= corn,
    (4 * ale) + (4 * beer) <= hops,
    (35 * ale) + (20 * beer) <= malt,
    ale >= 0.0,
    beer >= 0.0,
    corn <= 480,
    hops <= 160,
    malt <= 1190,
    malt >= 0,
    corn >= 0,
    hops >= 0,
  };
  
  kiwi::Solver solver;
  
  int len = sizeof(cns) / sizeof(cns[0]);
  for(int i = 0; i < len; i++) {
    solver.addConstraint(cns[i]);
  }
  
  solver.addEditVariable(profit, kiwi::strength::strong);
  solver.suggestValue(profit, 1000);
  solver.updateVariables();

  std::cout << "Profit: " << profit.value() << std::endl;
  std::cout << "Ale: " << ale.value() << std::endl;
  std::cout << "Beer: " << beer.value() << std::endl;
  std::cout << "Corn: " << corn.value() << std::endl;
  std::cout << "Hops: " << hops.value() << std::endl;
  std::cout << "Malt: " << malt.value() << std::endl;
  return 0;
}