-XBT_PUBLIC(double) surf_parse_get_double(const char *string);
-XBT_PUBLIC(int) surf_parse_get_int(const char *string);
-XBT_PUBLIC(double) surf_parse_get_time(const char *string, const char *entity_kind, const char *name);
-XBT_PUBLIC(double) surf_parse_get_size(const char *string, const char *entity_kind, const char *name);
-XBT_PUBLIC(double) surf_parse_get_bandwidth(const char *string, const char *entity_kind, const char *name);
-XBT_PUBLIC(double) surf_parse_get_speed(const char *string, const char *entity_kind, const char *name);
+XBT_PUBLIC(double) surf_parse_get_double(std::string s);
+XBT_PUBLIC(int) surf_parse_get_int(std::string s);
+XBT_PUBLIC(double) surf_parse_get_time(const char* string, const char* entity_kind, std::string name);
+XBT_PUBLIC(double) surf_parse_get_size(const char* string, const char* entity_kind, std::string name);
+XBT_PUBLIC(double) surf_parse_get_bandwidth(const char* string, const char* entity_kind, std::string name);
+XBT_PUBLIC(double) surf_parse_get_speed(const char* string, const char* entity_kind, std::string name);