[#boost-urls-param_pct_view-2constructor-03]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/param_pct_view.adoc[param_pct_view]::param_pct_view
:relfileprefix: ../../../
:mrdocs:


Construction

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/param.hpp#L824[boost/url/param.hpp]>`

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

== Description


This converts a param which may        contain unvalidated percent‐escapes into        a param whose key and value are        guaranteed to contain strings with no        invalid percent‐escapes, otherwise        an exception is thrown.

The new key and value reference        the same corresponding underlying        character buffers.        Ownership of the buffers is not transferred;        the caller is responsible for ensuring that        the assigned buffers remain valid until        they are no longer referenced.


=== Example

[,cpp]
----
param_pct_view qp( param_view( "key", "value" ) );
----

=== Complexity

Linear in `key.size() + value.size()`.


=== Exception Safety

Exceptions thrown on invalid input.



== Exceptions


|===
| Name | Thrown on

| `system_error`
| `key` or `value` contains an invalid percent escape.


|===

== Parameters


|===
| Name | Description

| *p*
| The param to construct from.


|===



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