Fix NDK Build. (#5886)

* Explicit cast for slice.
2020-07-14 18:34:19 +08:00
parent 970b4b3fa2
commit 3cae287dea
1 changed files with 2 additions and 1 deletions
--- 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();
 }