id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11312	smart_ptr::detail::as_allocator::allocate() adds alignment padding when it's not needed	David Aue <david@…>	Glen Fernandes	"smart_ptr::detail::as_allocator::allocate()
{
  enum {
     M = boost::alignment_of<type>::value
  };
  std::size_t n1 = count * sizeof(value_type);
  std::size_t n2 = data.size * sizeof(type);
  std::size_t n3 = n2 + M;
  CA ca(allocator());
  void* p1 = ca.allocate(n1 + n3);


Allocation is for two items of size n1 and n2. Alignment size is added to n2 to create n3 to there is room to align n2 properly.

if n1 % M == 0 then alignment is already fine and the extra M bytes is wasted.
"	Bugs	closed	Boost 1.64.0	smart_ptr	Boost 1.57.0	Problem	fixed