Re: [boost] [util] Any interest in address_of_first_nonarray_elem ?

From: mostafa_working_away@yahoo.com Date: Sun, 1 Dec 2013 20:10:53 -0800

Working with built-in array objects I find myself repeatedly needing to get the address of the first non-array element. This is so I can do generic array comparisons and copies without resorting to multiple loops. For example:

template bool generic_array_equal(T (&lhs)[N], T const (&rhs)[N]) { return std::equal( address_of_first_nonarray_elem(lhs), address_of_first_nonarray_elem(lhs) + total_extent::size, address_of_first_nonarray_elem(rhs)); }

Any interest in adding such a function to the util library?

I needed code like this when developing a multiple-dimension extension to "array." What about (not tested; quasi-C++14): //===== template < typename T> constexpr auto inner_addressof( T &&t, false_type ) { return addressof(forward<T>(t)); } template < typename T, size_t N> constexpr auto inner_addressof( T (&t)[N], true_type ) { return inner_addressof(t[0], integral_constant{}); } template < typename T> constexpr auto inner_addressof( T &&t ) { return inner_addressof(forward<T>(t), integral_constant{}); } template < typename T> struct inner_element_count : integral_constant { }; //===== No need for a custom range class. Daryle W.