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How can you use cin.getline() with std::string data type?

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Hi. As I was reading, I came across this question: how can you use cin.getline() with a std::string data type?
cin >> str;  // this just stores whats before the proceding white space. 

/* 
error: No user-defined-conversion operator available 
that can perform this conversion, or the operator 
cannot be called  
*/

cin.getline(str, sizeof(std::string), '\n'); 


Thanks, dxfoo

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