Add stream parameter to Problem::{print,check}

include/core/problem/problem.h

@@ -325,6 +325,11 @@ class Problem : public std::enable_shared_from_this<Problem>
 
     public:
         // Print and check ---------------------------------------
+        void print(int depth, //
+                   std::ostream& stream ,
+                   bool constr_by, //
+                   bool metric, //
+                   bool state_blocks) const;
         /**
          * \brief print wolf tree
          * \param depth :        levels to show ( 0: H, T, M : 1: H:S:p, T:F, M:L ; 2: T:F:C ; 3: T:F:C:f ; 4: T:F:C:f:c )
@@ -340,11 +345,8 @@ class Problem : public std::enable_shared_from_this<Problem>
                    bool constr_by = false, //
                    bool metric = true, //
                    bool state_blocks = false) const;
-        std::string printToString(int depth = 4, //
-                          bool constr_by = false,   //
-                          bool metric = true,       //
-                          bool state_blocks = false) const;
-        bool check(int verbose_level = 0) const;
+        bool check(int verbose_level) const;
+        bool check(bool verbose, std::ostream& stream) const;
 
 };