[#boost-urls-params_encoded_ref-replace-08]
= xref:boost/urls/params_encoded_ref/replace-08.adoc[boost::urls::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#L754[boost/url/params_encoded_ref.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
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,
    std::initializer_list<param_pct_view> init);
----

== Description

This function replaces a range of params with the params in an _initializer‐list_.

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.

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

== Exception Safety
Strong guarantee. Calls to allocate may throw. Exceptions thrown on invalid input.

== Exceptions

[cols=2]
|===
| Name
| Thrown on
| `system_error`
| `init` contains an invalid percent‐encoding.
|===

== Return Value

An iterator to the first element inserted, or one past `to` if `init.size() == 0`.

== Parameters

[cols=2]
|===
| Name
| Description
| *from,to*
| The range of params to replace.
| *init*
| The list of params to assign.
|===


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