fix the zero length vector

2014-09-01 22:50:48 -07:00
parent 9100ffc12a
commit 29a7027dba
2 changed files with 11 additions and 4 deletions
--- a/R-package/src/xgboost_R.cpp
+++ b/R-package/src/xgboost_R.cpp
@@ -197,7 +197,12 @@ extern "C" {
    for (int i = 0; i < len; ++i){
      dvec.push_back(R_ExternalPtrAddr(VECTOR_ELT(dmats, i)));
    }
-    void *handle = XGBoosterCreate(&dvec[0], dvec.size());
+    void *handle;
+    if (dvec.size() == 0) {
+      handle = XGBoosterCreate(NULL, 0);
+    } else {
+      handle = XGBoosterCreate(&dvec[0], dvec.size());
+    }
    SEXP ret = PROTECT(R_MakeExternalPtr(handle, R_NilValue, R_NilValue));
    R_RegisterCFinalizerEx(ret, _BoosterFinalizer, TRUE);
    UNPROTECT(1);