Partial application with a C++ lambda?

Question

EDIT: I use curry below, but have been informed this is instead partial application.

I\'ve been trying to figure out how one would write a curry function in C++, and i a

Answer 1

With some C++14 features, partial application that works on lambda's can be implemented in a pretty concise way.

template
auto partial( _function foo, _val v )
{
  return
    [foo, v](auto... rest)
    {
      return foo(v, rest...);
    };
}

template< typename _function, typename _val1, typename... _valrest >
auto partial( _function foo, _val1 val, _valrest... valr )
{
  return
    [foo,val,valr...](auto... frest)
    {
      return partial(partial(foo, val), valr...)(frest...);
    };
}

// partial application on lambda
int p1 = partial([](int i, int j){ return i-j; }, 6)(2);
int p2 = partial([](int i, int j){ return i-j; }, 6, 2)();