FIX: shared pointers were causing invalid frees in some examples

src/LearningMethods/LearningSequence.cpp

@@ -18,7 +18,7 @@ namespace lib4neuro {
 
     LearningSequence::~LearningSequence() = default;
 
-    void LearningSequence::add_learning_method(std::shared_ptr<LearningMethod> method) {
+    void LearningSequence::add_learning_method(LearningMethod *method) {
         this->learning_sequence.push_back(method);
     }
 

src/LearningMethods/LearningSequence.h

@@ -24,7 +24,7 @@ namespace lib4neuro {
         /**
          *
          */
-        std::vector<std::shared_ptr<LearningMethod>> learning_sequence;
+        std::vector<LearningMethod*> learning_sequence;
 
         /**
          *
@@ -62,7 +62,7 @@ namespace lib4neuro {
          *
          * @param method
          */
-        LIB4NEURO_API void add_learning_method(std::shared_ptr<LearningMethod> method);
+        LIB4NEURO_API void add_learning_method(LearningMethod *method);
     };
 
 }