:relfileprefix: ../../../../
[#boost-urls-grammar-alpha_chars_t-2constructor]

= xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/grammar.adoc[pass:[grammar]]::xref:boost/urls/grammar/alpha_chars_t.adoc[pass:[alpha_chars_t]]::alpha_chars_t



== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/alpha_chars.hpp#L50[boost/url/grammar/alpha_chars.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
constexpr
alpha_chars_t() noexcept = default;
----