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Update README.md

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Pranav Srinivas Kumar 2019-09-10 10:15:15 -05:00 committed by GitHub
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@ -124,7 +124,7 @@ Here's what's happening:
There are scenarios where you would like to make an optional argument ***required***. As discussed above, optional arguments either begin with `-` or `--`. You can make these types of arguments required like so: There are scenarios where you would like to make an optional argument ***required***. As discussed above, optional arguments either begin with `-` or `--`. You can make these types of arguments required like so:
```cpp ```cpp
program.add_argument("-o", "--output") program.add_argument("-o", "--output")
.required() .required()
.help("specify the output file."); .help("specify the output file.");
``` ```
@ -134,7 +134,7 @@ If the user does not provide a value for this parameter, an exception is thrown.
Alternatively, you could provide a default value like so: Alternatively, you could provide a default value like so:
```cpp ```cpp
program.add_argument("-o", "--output") program.add_argument("-o", "--output")
.default_value(std::string("-")) .default_value(std::string("-"))
.required() .required()
.help("specify the output file."); .help("specify the output file.");