bugfix booster.check

R-package/src/xgboost_R.cpp

@@ -59,6 +59,9 @@ inline void _WrapperEnd(void) {
 }
 
 extern "C" {
+  SEXP XGCheckNullPtr_R(SEXP handle) {
+    return ScalarLogical(R_ExternalPtrAddr(handle) == NULL);
+  }
   void _DMatrixFinalizer(SEXP ext) {    
     if (R_ExternalPtrAddr(ext) == NULL) return;
     XGDMatrixFree(R_ExternalPtrAddr(ext));

R-package/src/xgboost_R.h

@@ -11,6 +11,12 @@ extern "C" {
 }
 
 extern "C" {
+  /*!
+   * \brief check whether a handle is NULL
+   * \param handle
+   * \return whether it is null ptr
+   */
+  SEXP XGCheckNullPtr_R(SEXP handle);
   /*!
    * \brief load a data matrix 
    * \param fname name of the content