Shulou(Shulou.com)06/02 Report--

How to analyze the Visual Studio auto keyword, I believe that many inexperienced people are at a loss about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Visual Studio after a long period of development, many users have a good understanding of the Visual Studio auto keyword, here I would like to post a personal understanding, and discuss with you. The meaning of the auto keyword has changed in Clippers 0x. Starting with Visual C++ 2010, the Visual Studio auto keyword will be used to instruct the compiler to determine the data type of a variable based on its initial value. In other words, we can think of auto as a new data type that can "derive the true type of variable represented from the initializer (initialize)." This use of the auto keyword can greatly eliminate the lengthy and error-prone code caused by the current alternatives. Let's look at a practical example:

# include # include using namespace std; using namespace std::tr1; int main () {map m; const regex r ("(\\ w+) (\\ w+)"); for (string s; getline (cin, s);) {smatch results; if (regex_match (s, results, r)) {m [results [1]] = results [2];} for (auto I = m.begin () I! = m.end (); + + I) {cout second

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.