#include "./common.hpp"

#include <vector>

struct F2_vec { 
 std::vector<F2> vec; 
 F2_vec(size_t siz=0): vec (siz) {}
 F2_vec(F2_vec const & x): vec(x.vec) {}
 
 F2 const & operator()(size_t i) const { return vec[i];}

 template< typename... Args>
  typename triqs::clef::result_of::make_expr_call<F2_vec,Args...>::type
  operator()( Args&&... args ) const { return  triqs::clef::make_expr_call (*this,args...);}

 template<typename Fnt>
  friend void triqs_clef_auto_assign (F2_vec const & x, Fnt f) { 
   for (size_t i=0; i< x.vec.size(); ++i) triqs_clef_auto_assign(x.vec[i],  f(i)); } 

 friend std::ostream & operator<<(std::ostream & out, F2_vec const & x) { return out<<"F2_vec";}
};

triqs::clef::placeholder <4> i_; 

using  namespace triqs::clef;
int main() { 

 F2_vec V(3);

 //double x=1,y=2;

 { 
  auto expr = V(i_)(x_,y_);
  std::cout<<"expr = "<< expr<< std::endl;

  TEST( tql::eval(expr, x_=2,y_=3, i_=0));
  TEST( tql::eval(expr, x_=2));
  TEST( tql::eval(expr, x_=2,i_=1));
  TEST( tql::eval(expr, x_=2,y_=3));
  TEST( tql::eval(  tql::eval(expr, x_=2,y_=3) , i_=0) );
  std::cout<<"-------------"<<std::endl;
 }

 {
  // test assign
  V(i_)(x_,y_)  << x_ + i_; // + 10*y_ + 100*i_;
 }

}