[#boost-urls-string_token-preserve_size]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/string_token.adoc[string_token]::preserve_size
:relfileprefix: ../../../
:mrdocs:


Create a string token for a durable core::string_view

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/grammar/string_token.hpp#L452[boost/url/grammar/string_token.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class Alloc = std::allocator<char>>
/* implementation-defined */::xref:boost/urls/string_token/implementation_defined/preserve_size_t.adoc[preserve_size_t]<Alloc>
preserve_size(std::basic_string<char, std::char_traits<char>, Alloc>& s);
----

== Description


This function creates a xref:boost/urls/string_token/StringToken.adoc[StringToken]    which assigns to an existing plain string.

Functions using this token will assign    the result to the existing string and    return a `core::string_view` to it.





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