Unify lex_cast* and avoid string copies

We always use lex_cast either to string or from string, so I made that
explicit, and got rid of some string copies in the process.  There was
also stringify(), which was redundant to lex_cast<string>.

We also always used lex_cast_hex to string, so that's now hard-coded and
again eliminated a string copy.

For lex_cast_qstring<string>, there's no need to write the streamify the
input, so a specialization now operates directly on the input.

Hopefully this is a bit cleaner, and I do measure it to be a little
faster on scripts with many probes.

1 files changed, 1 insertions, 1 deletions

diff --git a/staptree.cxx b/staptree.cxx
index b4975017..090f0bd3 100644
--- a/staptree.cxx
+++ b/staptree.cxx
@@ -101,7 +101,7 @@ probe::probe ():
   body (0), tok (0)
 {
   static unsigned last_probeidx = 0;
-  this->name = string ("probe_") + lex_cast<string>(last_probeidx ++);
+  this->name = string ("probe_") + lex_cast(last_probeidx ++);
 }