Added missing destructor

neural_network/include/NeuralNetwork.hpp

@@ -126,6 +126,8 @@ class NeuralNetwork
 
   public :
 
+  virtual ~NeuralNetwork() = 0;
+
   /// @brief Convert a dynet expression to a string (usefull for debug purposes)
   ///
   /// @param expr The expression to convert.

neural_network/src/NeuralNetwork.cpp

@@ -5,11 +5,14 @@
  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.*/
+
 #include "NeuralNetwork.hpp"
 
 int NeuralNetwork::randomSeed = 0;
 bool NeuralNetwork::dynetIsInit = false;
 
+NeuralNetwork::~NeuralNetwork() {};
+
 std::string NeuralNetwork::expression2str(dynet::Expression & expr)
 {
   std::string result = "";