c++ - 'myStateType' was not declared in this scope caused by #typedef -


i tried use #typedef declare type own customized name convenient use:

class solution { public:     void dfs(vector<vector<char>>& board, int i, int j)     {         using namespace std;         #typedef std::pair<int, int> mystatetype;          std::queue<mystatetype> q; // error on line         ...     } };

however, compile error indicated on line std::queue<mystatetype> q;:

'mystatetype' not declared in scope

i still haven't figure out how error have happened? ideas? in advance!

typedef compiler token in c , c++ programming languages, not macro.

typedef std::pair<int,int> mystatetype; // don't put # before std:queue<mystatetype> q;

'mystatetype' not declared in scope: means programm not aware of type: mystatetype


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