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-rw-r--r--lib/Support/DeltaAlgorithm.cpp14
1 files changed, 8 insertions, 6 deletions
diff --git a/lib/Support/DeltaAlgorithm.cpp b/lib/Support/DeltaAlgorithm.cpp
index 9e52874..a1e3311 100644
--- a/lib/Support/DeltaAlgorithm.cpp
+++ b/lib/Support/DeltaAlgorithm.cpp
@@ -27,13 +27,15 @@ bool DeltaAlgorithm::GetTestResult(const changeset_ty &Changes) {
void DeltaAlgorithm::Split(const changeset_ty &S, changesetlist_ty &Res) {
// FIXME: Allow clients to provide heuristics for improved splitting.
+ // Get the iterator to the middle.
+ unsigned N = S.size() / 2;
+ changeset_ty::iterator middle(S.begin());
+ std::advance(middle, N);
+
+ // Create each vector using the middle as the split.
+ changeset_ty LHS(S.begin(), middle);
+ changeset_ty RHS(middle, S.end());
- // FIXME: This is really slow.
- changeset_ty LHS, RHS;
- unsigned idx = 0, N = S.size() / 2;
- for (changeset_ty::const_iterator it = S.begin(),
- ie = S.end(); it != ie; ++it, ++idx)
- ((idx < N) ? LHS : RHS).insert(*it);
if (!LHS.empty())
Res.push_back(LHS);
if (!RHS.empty())