[#boost-urls-encoding_opts-disallow_null]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/encoding_opts.adoc[encoding_opts]::disallow_null
:relfileprefix: ../../../
:mrdocs:


True if nulls are not allowed

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/encoding_opts.hpp#L68[boost/url/encoding_opts.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool disallow_null = false;
----

== Description


Normally all possible character values        (from 0 to 255) are allowed, with reserved        characters being replaced with escapes        upon encoding. When this option is true,        attempting to decode a null will result        in an error.





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