Buffer::filename() returns shared_ptr to string

src/core/Buffer.cc

@@ -86,7 +86,7 @@ bool Buffer::load_from_file(const char * filename)
     }
 
     load_text_in_buffer(buffer, buffer_size, file_size);
-    m_filename = filename;
+    m_filename = std::make_shared<std::string>(filename);
 
     return true;
 }

src/core/Buffer.h

@@ -131,7 +131,7 @@ public:
     bool insert_mode() const { return m_insert_mode; }
     void insert_code_point(const Buffer::Iterator & position, uint32_t code_point);
     void erase_code_point(const Buffer::Iterator & position);
-    std::string filename() const { return m_filename; }
+    std::shared_ptr<std::string> filename() const { return m_filename; }
     Iterator begin() const { return Iterator(this); }
     Iterator end() const { return *m_eof_iterator; }
     void push_operation() { m_operation_level++; }
@@ -152,7 +152,7 @@ protected:
     std::list<std::shared_ptr<Iterator>> m_iterators;
     std::list<std::shared_ptr<Iterator>> m_cursors;
     std::shared_ptr<Iterator> m_eof_iterator;
-    std::string m_filename;
+    std::shared_ptr<std::string> m_filename;
     std::shared_ptr<ChangeOperation> m_current_change_operation;
     int m_operation_level;
     size_t m_current_change_operation_index;