structopt | lovely structopt library for C++

So, you want to parse command line arguments by just defining a struct? Here we go!. First, let's define a struct,. Suppose we want to add a host option. That's it. And let me tell you what happened. structopt_option(name, type) is a macro. This example defines an option which is named host and has a std::string value. The mandatory attribute decides if the command line arguments must contain host. By default its value is false, so if you don't want this you can just ignore it. Now let's run it without any command line arguments,. By default, the long option name is exactly the name you define it. And the short one is the first character of the name. Move on. We also want a port number whose default value is 80,. Cool! But I want a flag and I don't want a short name,. By assigning \0 to the short_alias attribute, we disable the short option name. However, we can't ban the long one for now. And yes, the name long_alias reminds me. If you want a different long option name, you can .long_alias = "<new name>". short_alias works too.
structopt is header-only, so you can just download structopt.hpp and place it to your include path. Since structopt depends on tanakh/cmdline, make sure you have installed cmdline (header-only too) in your include path.
xmake is an amazing build utility for C/C++ 👍. If you use xmake in your project, you can paste the following configuration to your xmake.lua, then you can use add_requires(structopt) and add_pacakges(structopt) to add structopt to your project.