[#fmt-underlying]
= xref:fmt.adoc[fmt]::underlying
:relfileprefix: ../
:mrdocs:

Converts `e` to the underlying type.

== Synopsis

Declared in `<fmt/format.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename Enum>
constexpr
xref:fmt/underlying_t.adoc[underlying_t<Enum>]
underlying(Enum e) noexcept;
----

== Description

*Example*:

enum class color { red, green, blue }; auto s = fmt::format("{}", fmt::underlying(color::red)); // s == "0"


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