C++ struct initialization

---- / from boost.asio example / ----
struct mapping
{
  const char* extension;
  const char* mime_type;
} mappings[] =
{
  { "gif", "image/gif" },
  { "htm", "text/html" },
  { "html", "text/html" },
  { "jpg", "image/jpeg" },
  { "png", "image/png" },
  { "swf", "application/x-shockwave-flash" },
  { 0, 0 } // Marks end of list.
};