Cv :: String and std :: string: when to use which one and the need to use both?

Question

As part of a project, OpenCV is commonly cv::Stringused in functions, for example. simple putText. However, when using functions, it std std::stringanswers. For instance. when

ifstream stream(filepath);
string line;
getline(stream, line, '\n');

it is necessary that a std::string, since it cv::Stringthrows an error. Otherwise, using the OpenCV function std::stringproperly converts to cv::Stringand the following code works:

string Str = "Test";
putText(img, Str, Point(10, 10), FONT_HERSHEY_PLAIN, 1, Scalar::all(255), 1);

Questions

Why does OpenCV have its own String-Class? I think there may be some differences for OpenCV, while cv::Stringfunctionality is still possible (or most?) std::string. But it seems that std::stringyou can convert to cv::String(which I tested, at least for putText.

The docs show similar functions, but also some differences, such as related functions static bool operator> (const String &lhs, const String &rhs)and similar:

http://docs.opencv.org/3.1.0/d1/d8f/classcv_1_1String.html for cv::String http://www.cplusplus.com/reference/string/string/ forstd::string

Did I miss something?

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: QString , std::string , . , OpenCV.

Answer 1

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Answer 2

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