map.find的问题

Question

std::map< std::string,std::set<int> > wordsTable;
std::set<int>::iterator it_lines_set = wordsTable.find(“a");

报错：error C2440: 'initializing' : cannot convert from 'std::_Tree_iterator<_Mytree>' to 'std::_Tree_const_iterator<_Mytree>'

 

请问这是什么问题？

Answer 1

Map里面的Iterator是一个set而不是iterator

std::set<int> it_lines_set = wordsTable.find(“a");

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麻烦把正确答案设为解答。

Answer 2

std::map< std::string,std::set<int> >::iterator it_lines_set = wordsTable.find(“a")