[#boost-urls-params_encoded_ref-replace-06]
= 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#L792[boost/url/params_encoded_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class FwdIt>
xref:boost/urls/params_encoded_base/iterator.adoc[iterator]
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);
----

== Description


This function replaces a range of        params with a range of params.

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

[NOTE]
The strings referenced by the inputs        must not come from the underlying url,        or else the behavior is undefined.


=== Mandates

[,cpp]
----
std::is_convertible< std::iterator_traits< FwdIt >::reference_type, param_pct_view >::value == true
----

=== Complexity

Linear in `this&hyphen;&gt;url()&period;encoded&lowbar;query()&period;size()`&period;


=== Exception Safety

Strong guarantee&period;        Calls to allocate may throw&period;        Exceptions thrown on invalid input&period;



== Exceptions


|===
| Name | Thrown on

| `system&lowbar;error`
| The range contains an invalid percent&hyphen;encoding&period;


|===

== Return Value


An iterator to the first        element inserted, or one past `to` if        `first &equals;&equals; last`&period;



== Parameters


|===
| Name | Description

| *from,to*
| The range of params to        replace&period;


| *first,*
| last The range of params        to assign&period;


|===



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