Re: [Boost-users] Safe way to allocate block of memory

31 Oct 2006


      ...
-----Original Message-----
From: boost-users-bounces@lists.boost.org [mailto:boost-users-
bounces@lists.boost.org] On Behalf Of Stephen Torri
Sent: Tuesday, October 31, 2006 9:34 AM
To: boost-users@lists.boost.org
Subject: Re: [Boost-users] Safe way to allocate block of memory
On Tue, 2006-10-31 at 06:49 -0500, Nat Goodspeed wrote:
...
[Nat] Have you tried using a std::vector<unsigned char>? You can get
a
pointer to the first byte in the vector by &myVector[0]. Then
std::vector takes care of all the rest for you -- including
allocation,
cleanup and the STL container support.
// present_pos is an std::vectorboost::uint8_t::iterator to the
// where the reading will start.
//
// dest_addr_ptr is where to write in memory
//
// length is how many bytes to read.
void read ( boost::uint8_t* dest_addr_ptr, boost::uint32_t const&
length )
{
  if ( present_pos + length > data.end() )
  {
      // ERROR
  }
memcpy ( dest_addr_ptr, *(*present_pos), length;
[Nat] memcpy ( dest_addr_ptr, &(*present_pos), length );

or even

      // trust STL implementation to optimize appropriately
      std::copy(present_pos, present_pos + length, dest_addr_ptr);
...
}