added empty() method to common features2d classes; fixed #831

2011-01-31 14:18:50 +00:00
parent fa446e7e35
commit 9b4c682623
7 changed files with 112 additions and 19 deletions
--- a/modules/features2d/src/calonder.cpp
+++ b/modules/features2d/src/calonder.cpp
@@ -860,8 +860,11 @@ int RTreeClassifier::countNonZeroElements(float *vec, int n, double tol)
 void RTreeClassifier::read(const char* file_name)
 {
  std::ifstream file(file_name, std::ifstream::binary);
-  read(file);
-  file.close();
+  if( file.is_open() )
+  {
+      read(file);
+      file.close();
+  }
 }

 void RTreeClassifier::read(std::istream &is)