minimal named arguments for C++ 11

cpp11-named-args.cpp

#include <iostream>

template<typename Lhs, typename Rhs>
struct assignment_t
{
  using lhs_t = Lhs;
  using rhs_t = Rhs;
  lhs_t _lhs;
  rhs_t _rhs;   
};

template<typename T>
struct named_arg_t
{
	using type = assignment_t<named_arg_t, T>;
	auto operator=(T arg)
	  -> assignment_t<named_arg_t, T>
	{
	  return { {}, arg };
	}    
};

// usage string:
named_arg_t<std::string> first_name{};
named_arg_t<std::string> second_name{};

void test_func(named_arg_t<std::string>::type first_name, named_arg_t<std::string>::type second_name) 
{
  auto firstname_val = first_name._rhs;
  auto secondname_val = second_name._rhs;
  std::cout << "first name=" << firstname_val 
            << ", second name=" << secondname_val 
            << std::endl;
}

// usage bool:
named_arg_t<bool> enable_widgets{};

void test_func_bool(const std::string& name, named_arg_t<bool>::type enable_widgets)
{
  if(enable_widgets._rhs)    
  {
    std::cout << "enable widgets for: " << name << std::endl; 
  }
}

// TEST:
int main(int argc, char* argv[])
{
  test_func(first_name = "alfa", second_name = "beta");
  //test_func("alfa"); -- too much, not supported!
    
  test_func_bool("zeta", enable_widgets = true);    
  return 0;
}