[#boost-urls-params_encoded_ref-replace]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/params_encoded_ref.adoc[params_encoded_ref]::replace
:relfileprefix: ../../../
:mrdocs:


Replace params

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_encoded_ref.hpp#L705[boost/url/params_encoded_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/params_encoded_base/iterator.adoc[iterator]
xref:boost/urls/params_encoded_ref/replace-0f.adoc[replace](
    xref:boost/urls/params_encoded_base/iterator.adoc[iterator] pos,
    xref:boost/urls/param_pct_view.adoc[param_pct_view] const& p);
----

[.small]#xref:boost/urls/params_encoded_ref/replace-0f.adoc[_» more..._]#

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/params_encoded_base/iterator.adoc[iterator]
xref:boost/urls/params_encoded_ref/replace-08.adoc[replace](
    xref:boost/urls/params_encoded_base/iterator.adoc[iterator] from,
    xref:boost/urls/params_encoded_base/iterator.adoc[iterator] to,
    std::initializer_list<xref:boost/urls/param_pct_view.adoc[param_pct_view]> init);
----

[.small]#xref:boost/urls/params_encoded_ref/replace-08.adoc[_» more..._]#

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class FwdIt>
xref:boost/urls/params_encoded_base/iterator.adoc[iterator]
xref:boost/urls/params_encoded_ref/replace-06.adoc[replace](
    xref:boost/urls/params_encoded_base/iterator.adoc[iterator] from,
    xref:boost/urls/params_encoded_base/iterator.adoc[iterator] to,
    FwdIt first,
    FwdIt last);
----

[.small]#xref:boost/urls/params_encoded_ref/replace-06.adoc[_» more..._]#

== 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.

[NOTE]
The strings passed in must not come        from the element being replaced,        or else the behavior is undefined.


=== Example

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

u.encoded_params().replace( u.encoded_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.        Exceptions thrown on invalid input.



== Exceptions


|===
| Name | Thrown on

| `system_error`
| `p` contains an invalid percent‐encoding.


|===

== Return Value


An iterator to the element.



== Parameters


|===
| Name | Description

| *pos*
| An iterator to the element.


| *p*
| The param to assign.


| *from,to*
| The range of params        to replace.


| *init*
| The list of params to assign.


| *first,*
| last The range of params        to assign.


|===



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