A good summay is here.

String

Performance

1. If there is some block of useless code, the compile is smart enough to ignore it and thus speed up the program.

2. Use the option -O2 to generate optimized code when you are ready to publish your code.

3. Define variables only when needed to avoid the overhead of creating …

Lambda Function

Check [here[(https://github.com/dclong/cearn/tree/master/lambda) for illustrative examples for the following discussions.

1. When capture variables, you can define new variables in the [] of a lambda expression. For example, if a lambda function need the sum of two double variable x and y, you …

1. {} is more powerful than () and thus is preferred over (). You should use always use {} except for a few cases where () is necessary. For example, if you want to create a vector of length 1000, you have to use

   vector<int>(1000);
   

instead of

    vector<int> {1000};

which create a vector …

GSL is an advance C/C++ library that is widely used. To install GSL, you can download the source file and following instruction in the included README and INSTALL document. For Unix/Linux users, the GSL library is often availabe in the repository. For example, you can use the following …