:relfileprefix: ../../../
[#7584DE9369114B8DE192D06BB986479ECD770AA3]

= Function params_encoded_base::count

pass:v,q[Return the number of matching keys]


== Synopsis

Declared in header `</boost/url/params_encoded_base.hpp#L304[boost/url/params_encoded_base.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
size_t
count(
    xref:boost/urls/pct_string_view.adoc[pct_string_view] key,
    xref:boost/urls/ignore_case_param.adoc[ignore_case_param] ic = = {}) const noexcept;
----

== Description

pass:v,q[This function examines the parameters] pass:v,q[in the container to find the number of]
pass:v,q[matches for the specified key,]
pass:v,q[which may contain percent escapes.]
pass:v,q[The comparison is performed as if all]
pass:v,q[escaped characters were decoded first.]

=== Example
[,cpp]
----
assert( url_view( "?first=John&last=Doe" ).encoded_params().count( "first" ) == 1 );
----

=== Complexity
pass:v,q[Linear in `this->buffer().size()`.]

=== Exception Safety
pass:v,q[Exceptions thrown on invalid input.]



== Return Value

* `size_t` 


== Parameters

|===
| Name | Type 

| *key*
| `pct_string_view`

| *ic*
| `ignore_case_param`

|===