Fix NDK Build. (#5886)

* Explicit cast for slice.
dmlc · Jul 14, 2020 · 3cae287 · 3cae287
1 parent 970b4b3
commit 3cae287
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/c_api/c_api.cc b/src/c_api/c_api.cc
@@ -227,7 +227,8 @@ XGB_DLL int XGDMatrixSliceDMatrixEx(DMatrixHandle handle,
         << "slice does not support group structure";
   }
   DMatrix* dmat = static_cast<std::shared_ptr<DMatrix>*>(handle)->get();
-  *out = new std::shared_ptr<DMatrix>(dmat->Slice({idxset, len}));
+  *out = new std::shared_ptr<DMatrix>(
+      dmat->Slice({idxset, static_cast<std::size_t>(len)}));
   API_END();
 }