New features of C++11 that I like

I recently compiled my psi4 libraries using C++11 and started using some of the features of this language. There are several new useful features of the language and library additions. Here are some that I have started to use in my code.

• Tuples – Tuples are containers that can collect different type of data. Here is an example of how I have been using tuples in my code:

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  // a vector of tuples (double,int,int) std::vector<std::tuple<double,int,int>> vec_tuple;   // tuples can be added with std::make_tuple vec_tuple.push_back( std::make_tuple(1.0,2,3) ); vec_tuple.push_back( std::make_tuple(3.0,3,5) );   // Let's sort the vector of tuples std::sort(vec_tuple.begin(),vec_tuple.end());   // Loop over the first ten elements of the sorted vector for (int i = 0; i < 10; ++i){ double c; int m,n; // access the elements by unpacking them with std::tie ... std::tie(c,m,n) = vec_tuple[i];   // ... or use the std::get function c = std::get<0>(vec_tuple[i]); }

  // a vector of tuples (double,int,int) std::vector<std::tuple<double,int,int>> vec_tuple; // tuples can be added with std::make_tuple vec_tuple.push_back( std::make_tuple(1.0,2,3) ); vec_tuple.push_back( std::make_tuple(3.0,3,5) ); // Let's sort the vector of tuples std::sort(vec_tuple.begin(),vec_tuple.end()); // Loop over the first ten elements of the sorted vector for (int i = 0; i < 10; ++i){ double c; int m,n; // access the elements by unpacking them with std::tie ... std::tie(c,m,n) = vec_tuple[i]; // ... or use the std::get function c = std::get<0>(vec_tuple[i]); }