:relfileprefix: ../../
[#boost-urls-encode-04]

== xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::encode


Return a percent-encoded string


=== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/encode.hpp#L184[boost/url/encode.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
template<
    class StringToken = xref:boost/urls/string_token.adoc[string_token]::xref:boost/urls/string_token/return_string.adoc[return_string],
    class CharSet>
StringToken::result_type
encode(
    core::string_view s,
    CharSet const& unreserved,
    xref:boost/urls/encoding_opts.adoc[encoding_opts] opt = = {},
    StringToken&& token) noexcept;
----

=== Description


This function applies percent-encoding
to the string using the given options and
character set, and returns the result as
a string when called with default arguments.
[,cpp]
----
encoding_opts opt;
opt.space_as_plus = true;
std::string s = encode( "My Stuff", opt, pchars );

assert( s == "My+Stuff" );
----

=== Calls to allocate may throw.

* link:https://datatracker.ietf.org/doc/html/rfc3986#section-2.1[2.1. Percent-Encoding (rfc3986)]




=== Return Value


The string



=== Parameters

|===
| Name | Description 

| *s*
| 
The string to encode.

| *unreserved*
| 
The set of characters
that is not percent-encoded.

| *opt*
| 
The options for encoding. If
this parameter is omitted, the default
options are used.

| *token*
| 
A string token.

|===




=== See Also


xref:boost/urls/encode-04.adoc[encode]
,
xref:boost/urls/encoded_size.adoc[encoded_size]
,
xref:boost/urls/encoding_opts.adoc[encoding_opts]
,



