[#boost-urls-static_url-set_params]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/static_url.adoc[static_url]::set_params
:relfileprefix: ../../../
:mrdocs:

Set the query params

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/static_url.hpp#L412[boost/url/static_url.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/static_url.adoc[static_url]&
set_params(
    std::initializer_list<param_view> ps,
    xref:boost/urls/encoding_opts.adoc[encoding_opts] opts = {});
----

== Description

This sets the query params to the list of param_view, which can be empty.

An empty list of params is distinct from having no params.

Reserved characters in the string are percent‐escaped in the result.

== Example
[,cpp]
----
assert( url( "http://example.com" ).set_params( {"id", "42"} ).query() == "id=42" );
----
== Postconditions
[,cpp]
----
this->has_query() == true
----
== Exception Safety
Strong guarantee. Calls to allocate may throw.

== Complexity
Linear.

== BNF
[,cpp]
----
query           = *( pchar / "/" / "?" )

query-param     = key [ "=" value ]
query-params    = [ query-param ] *( "&" query-param )
----
== Specification
* https://datatracker.ietf.org/doc/html/rfc3986#section-3.4
            >3.4.  Query (rfc3986)</a>
        @li <a href=[]

== Return Value

`&ast;this`

== Parameters

[cols=2]
|===
| Name
| Description
| *ps*
| The params to set&period;
| *opts*
| The options for encoding&period;
|===

== See Also

xref:boost/urls/url_base/encoded_params-0b.adoc[`encoded&lowbar;params`], xref:boost/urls/static_url/remove_query.adoc[`remove&lowbar;query`], xref:boost/urls/static_url/set_encoded_query.adoc[`set&lowbar;encoded&lowbar;query`], xref:boost/urls/static_url/set_query.adoc[`set&lowbar;query`]&period;


[.small]#Created with https://www.mrdocs.com[MrDocs]#