# Enum ArgParseArgument::ArgumentType
Define the type of an ArgParseArgument.

Defined in | <seqan/arg_parse.h>
Signature | `enum ArgParseArgument::ArgumentType;`

## Enum Values

`STRING` | Argument is a string.
`INTEGER` | Argument is a signed 32 bit integer.
`INT64` | Argument is a signed 64 bit integer.
`DOUBLE` | Argument is a floating point number stored as double.
`INPUT_FILE` | Argument is an input file.
`OUTPUT_FILE` | Argument is an output file.
`INPUT_PREFIX` | Argument is a prefix to input file(s).
`OUTPUT_PREFIX` | Argument is a prefix to output file(s).

## Detailed Description

### Examples

In the following example, the types `INPUT_FILE`, `OUTPUT_FILE`, and `DOUBLE` are used.

    #include <iostream>

    #include <seqan/basic.h>
    #include <seqan/sequence.h>
    #include <seqan/stream.h>      // For printing SeqAn Strings.

    #include <seqan/arg_parse.h>

    using namespace seqan;

    int main(int argc, char const ** argv)
    {
        // Initialize ArgumentParser.
        ArgumentParser parser("arg_parse_demo");
        setCategory(parser, "Demo");
        setShortDescription(parser, "Just a demo of the new ArgumentParser!");
        setVersion(parser, "0.1");
        setDate(parser, "Mar 2012");

        // Add use and description lines.
        addUsageLine(parser, "[\\fIOPTIONS\\fP] \\fIIN\\fP \\fIOUT\\fP ");

        addDescription(
            parser,
            "This is just a little demo to show what ArgumentParser is "
            "able to do.  \\fIIN\\fP is a multi-FASTA input file.  \\fIOUT\\fP is a "
            "txt output file.");

        // Add positional arguments and set their valid file types.
        addArgument(parser, ArgParseArgument(ArgParseArgument::INPUT_FILE, "IN"));
        addArgument(parser, ArgParseArgument(ArgParseArgument::OUTPUT_FILE, "OUT"));
        setValidValues(parser, 0, "FASTA fa");
        setValidValues(parser, 1, "txt");

        // Add a section with some options.
        addSection(parser, "Important Tool Parameters");
        addOption(parser, ArgParseOption("", "id", "Sequence identity between [0.0:1.0]",
                                         ArgParseArgument::DOUBLE, "ID"));
        setRequired(parser, "id", true);
        setMinValue(parser, "id", "0.0");
        setMaxValue(parser, "id", "1.0");

        // Adding a verbose and a hidden option.
        addSection(parser, "Miscellaneous");
        addOption(parser, ArgParseOption("v", "verbose", "Turn on verbose output."));
        addOption(parser, ArgParseOption("H", "hidden", "Super mysterious flag that will not be shown in "
                                                        "the help screen or man page."));
        hideOption(parser, "H");

        // Add a Reference section.
        addTextSection(parser, "References");
        addText(parser, "http://www.seqan.de");

        // Parse the arguments.
        ArgumentParser::ParseResult res = parse(parser, argc, argv);
        // Return if there was an error or a built-in command was triggered (e.g. help).
        if (res != ArgumentParser::PARSE_OK)
            return res == ArgumentParser::PARSE_ERROR;  // 1 on errors, 0 otherwise

        // Extract and print the options.
        bool verbose = false;
        getOptionValue(verbose, parser, "verbose");
        std::cout << "Verbose:     " << (verbose ? "on" : "off") << std::endl;

        double identity = -1.0;
        getOptionValue(identity, parser, "id");
        std::cout << "Identity:    " << identity << std::endl;

        CharString inputFile, outputFile;
        getArgumentValue(inputFile, parser, 0);
        getArgumentValue(outputFile, parser, 1);

        std::cout << "Input-File:  " << inputFile << std::endl;
        std::cout << "Output-File: " << outputFile << std::endl;

        return 0;
    }

Demo: demos/dox/arg_parse/argument_parser.cpp

#### Dox Sources

    /*!
     * @enum ArgParseArgument::ArgumentType
     *
     * @headerfile <seqan/arg_parse.h>
     *
     * @brief Define the type of an @link ArgParseArgument @endlink.
     *
     * @signature enum ArgParseArgument::ArgumentType;
     *
     * @section Examples
     *
     * In the following example, the types <tt>INPUT_FILE</tt>,
     * <tt>OUTPUT_FILE</tt>, and <tt>DOUBLE</tt> are used.
     *
     * @include demos/dox/arg_parse/argument_parser.cpp
     *
     *
     *
     * @val ArgParseArgument::ArgumentType STRING;
     *
     * @brief Argument is a string.
     *
     * @val ArgParseArgument::ArgumentType ArgParseArgument::INTEGER;
     *
     * @brief Argument is a signed 32 bit integer.
     *
     * @val ArgParseArgument::ArgumentType ArgParseArgument::INT64;
     *
     * @brief Argument is a signed 64 bit integer.
     *
     * @val ArgParseArgument::ArgumentType ArgParseArgument::DOUBLE;
     *
     * @brief Argument is a floating point number stored as double.
     *
     * @val ArgParseArgument::ArgumentType ArgParseArgument::INPUT_FILE;
     *
     * @brief Argument is an input file.
     *
     * @val ArgParseArgument::ArgumentType ArgParseArgument::OUTPUT_FILE;
     *
     * @brief Argument is an output file.
     *
     * @val ArgParseArgument::ArgumentType ArgParseArgument::INPUT_PREFIX;
     *
     * @brief Argument is a prefix to input file(s).
     *
     * @val ArgParseArgument::ArgumentType ArgParseArgument::OUTPUT_PREFIX;
     *
     * @brief Argument is a prefix to output file(s).
     */