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# mail::Header::mime

## Name

mail::Header::mime -- A structured MIME header.

## Synopsis

#include <libmail/headers.H>
mail::Header::mime content_type("Content-Type", "text/plain");
content_type.parameters.set_simple("charset", "iso-8859-1");
mail::Header::mime content_disposition("Content-Disposition", "attachment")
("filename", "document.doc")
("name", "Monthly Sales", "iso-8859-1", "EN");
std::cout << content_type.toString();

## USAGE

This class creates a structured MIME header. A structured MIME header, like `Content-Type` or `Content-Disposition` contains a literal value, and zero or more "name=setting" parameters, separated by semicolons.

Two arguments are provided to the constructor, the header's name, and its literal value. After constructing, use the `parameters` member to set the parameters. This member has the following methods:

set_simple(std::string name, std::string value)

  Set parameter `name` to `value`. `value` must contain `US-ASCII` text only.

set(std::string name, std::string value, std::string charset, std::string language)

  Set parameter `name` to `value`. `charset` specifies `value`'s character set. `language` is optional, and specifies `value`'s language. `value` is converted to `US-ASCII` text according to RFC 2231.

erase(std::string name)

  Remove parameter `name`.

The `toString()` returns the header as a single text string: "name: value". Long headers are folded accordingly.

### Dynamic parameter generation

Parameters can also be dynamically populated by repeatedly calling the "()".

One version of the "()" operator receives the parameter name and value, and corresponds to the `set_simple` method. The second version also receives the character set and language information, and corresponds to the `set` function.

## SEE ALSO

mail::Header::addresslist(3x), mail::Header::encoded(3x), mail::Header::list(3x), mail::Header::plain(3x).

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