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Pranav Srinivas Kumar 2019-04-01 19:46:34 -04:00 committed by GitHub
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@ -47,7 +47,7 @@ Here's what's happening:
* The ```add_argument()``` method is used to specify which command-line options the program is willing to accept. In this case, I’ve named it square so that it’s in line with its function. * The ```add_argument()``` method is used to specify which command-line options the program is willing to accept. In this case, I’ve named it square so that it’s in line with its function.
* Command-line arguments are strings. Inorder to square the argument and print the result, we need to convert this argument to a number. In order to do this, we use the ```.action``` method and provide a lambda function that takes the argument value (std::string) and returns the square of the number it represents. Actions are quite powerful as you will see in later examples. * Command-line arguments are strings. Inorder to square the argument and print the result, we need to convert this argument to a number. In order to do this, we use the ```.action``` method and provide a lambda function that takes the argument value (std::string) and returns the square of the number it represents. Actions are quite powerful as you will see in later examples.
* Calling our program now requires us to specify an option. * Calling our program now requires us to specify an option.
* The parse_args() method parses the arguments provided, converts our input into an integer and returns the square. * The ```parse_args()``` method parses the arguments provided, converts our input into an integer and returns the square.
* We can get the value stored by the parser for a given argument using ```parser.get<T>(key)``` method. * We can get the value stored by the parser for a given argument using ```parser.get<T>(key)``` method.
### Optional Arguments ### Optional Arguments