Avoid string in amount_t::in_place_truncate

Do not serialize to string just to get rounded value.
`in_place_roundto` should be reliable enough now.

1 files changed, 1 insertions, 26 deletions

diff --git a/src/amount.cc b/src/amount.cc
index 22282150..3e647481 100644
--- a/src/amount.cc
+++ b/src/amount.cc
@@ -622,40 +622,15 @@ void amount_t::in_place_round()
 
 void amount_t::in_place_truncate()
 {
-#if 1
   if (! quantity)
     throw_(amount_error, _("Cannot truncate an uninitialized amount"));
 
-  _dup();
-
   DEBUG("amount.truncate",
         "Truncating " << *this << " to precision " << display_precision());
 
-  std::ostringstream out;
-  stream_out_mpq(out, MP(quantity), display_precision());
-
-  scoped_array<char> buf(new char [out.str().length() + 1]);
-  std::strcpy(buf.get(), out.str().c_str());
-
-  char * q = buf.get();
-  for (char * p = q; *p != '\0'; p++, q++) {
-    if (*p == '.') p++;
-    if (p != q) *q = *p;
-  }
-  *q = '\0';
-
-  mpq_set_str(MP(quantity), buf.get(), 10);
-
-  mpz_ui_pow_ui(temp, 10, display_precision());
-  mpq_set_z(tempq, temp);
-  mpq_div(MP(quantity), MP(quantity), tempq);
+  in_place_roundto(display_precision());
 
   DEBUG("amount.truncate", "Truncated = " << *this);
-#else
-  // This naive implementation is straightforward, but extremely inefficient
-  // as it requires parsing the commodity too, which might be fully annotated.
-  *this = amount_t(to_string());
-#endif
 }
 
 void amount_t::in_place_floor()