* Operation `--delete-generations' to delete generations of a

  profile.  Arguments are either generation number, or `old' to delete
  all non-current generations.  Typical use:

  $ nix-env --delete-generations old
  $ nix-collect-garbage

* istringstream -> string2Int.

1 files changed, 1 insertions, 11 deletions

diff --git a/src/nix-env/names.cc b/src/nix-env/names.cc
index c6054d6c1bef..93bcfda24e60 100644
--- a/src/nix-env/names.cc
+++ b/src/nix-env/names.cc
@@ -56,20 +56,10 @@ static string nextComponent(string::const_iterator & p,
 }
 
 
-#include <fstream>
-
-static bool parseInt(const string & s, int & n)
-{
-    istringstream st(s);
-    st >> n;
-    return !st.fail();
-}
-
-
 static bool componentsLT(const string & c1, const string & c2)
 {
     int n1, n2;
-    bool c1Num = parseInt(c1, n1), c2Num = parseInt(c2, n2);
+    bool c1Num = string2Int(c1, n1), c2Num = string2Int(c2, n2);
 
     if (c1Num && c2Num) return n1 < n2;
     else if (c1 == "" && c2Num) return true;