C++17 in Detail: A Deep Dive/

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Parsing command line

Parsing command line

Here we discuss how to parse command line to test for the existence of parameters. Read below to find out more!

We'll cover the following...

Command line might contain text arguments that could be interpreted in a few ways:

  • as an integer
  • as a floating-point
  • as a boolean flag
  • as a string (not parsed)
  • or some other types…

Simple int and string version

We can build a variant that will hold all the possible options.

Here’s a simple version with int and string:

class CmdLine
{
public:
    using Arg = std::variant<int, std::string>;
private:
    std::map<std::string, Arg> mParsedArgs;
public:
    explicit CmdLine(int argc, char** argv) {
        ParseArgs(argc, argv);
    }
    std::optional<Arg> Find(const std::string& name) const;
// ...
};

Now let’s look at the parsing code! ...