[#boost-urls-params_ref-replace-0d]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/params_ref.adoc[params_ref]::replace
:relfileprefix: ../../../
:mrdocs:


Replace elements

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_ref.hpp#L691[boost/url/params_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/params_base/iterator.adoc[iterator]
replace(
    xref:boost/urls/params_base/iterator.adoc[iterator] pos,
    xref:boost/urls/param_view.adoc[param_view] const& p);
----

== Description


This function replaces the contents        of the element at `pos` with the        specified param.

All iterators that are equal to        `pos` or come after are invalidated.


=== Example

[,cpp]
----
url u( "?first=John&last=Doe" );

u.params().replace( u.params().begin(), { "title", "Mr" });

assert( u.encoded_query() == "title=Mr&last=Doe" );
----

=== Complexity

Linear in `this‐>url().encoded_query().size()`.


=== Exception Safety

Strong guarantee.        Calls to allocate may throw.



== Return Value


An iterator to the element.



== Parameters


|===
| Name | Description

| *pos*
| An iterator to the element.


| *p*
| The param to assign.


|===



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