add operator == in Bernstein struct

include/curves/bernstein.h

@@ -45,6 +45,17 @@ struct Bern {
     return bin_m_i_ * (pow(u, i_)) * pow((1 - u), m_minus_i);
   }
 
+  virtual bool operator== (const Bern& other) const{
+    return m_minus_i == other.m_minus_i
+        && i_ == other.i_
+        && bin_m_i_ == other.bin_m_i_;
+  }
+
+  virtual bool operator!=(const Bern& other) const {
+    return !(*this == other);
+  }
+
+
   /* Attributes */
   Numeric m_minus_i;
   Numeric i_;