c++ - Cause of unknown type name and undeclared identifier errors? -

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i have header file that's linked others in project of mine. here code in file that's giving me error:

#ifndef relation_h_ #define relation_h_  #include <set> #include <string> #include "scheme.h" #include "tuple.h"  class relation { public:     void select();     void project();     void rename();  private:     std:string name;     scheme scheme;     std::set<tuple> tuples; };  #endif /* relation_h_ */

when compile, error follows:

./relation.h:25:2: error: unknown type name 'std'         std:string name;         ^ ./relation.h:25:6: error: use of undeclared identifier 'string'         std:string name;

i have checked circular dependencies (the 2 files included here have no other files included in them) , can see <string> class included. no errors occur std::set. might causing problem?

update: measure, isolated file , 5 associated (the .cpp , 2 pairs included) , compiled. got same error.


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