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


Common functionality for containers

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/params_base.hpp#L46[boost/url/params_base.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class params_base;
----

== Types

[cols=2]
|===
| Name | Description 

| xref:boost/urls/params_base/const_iterator.adoc[`const_iterator`] 
| A Bidirectional iterator to a query parameter

| xref:boost/urls/params_base/const_reference.adoc[`const_reference`] 
| The reference type

| xref:boost/urls/params_base/difference_type.adoc[`difference_type`] 
| A signed integer type used to represent differences.

| xref:boost/urls/params_base/iterator.adoc[`iterator`] 
| A Bidirectional iterator to a query parameter

| xref:boost/urls/params_base/reference.adoc[`reference`] 
| The reference type

| xref:boost/urls/params_base/size_type.adoc[`size_type`] 
| An unsigned integer type to represent sizes.

| xref:boost/urls/params_base/value_type.adoc[`value_type`] 
| The value type

|===
== Member Functions

[cols=2]
|===
| Name | Description 

| xref:boost/urls/params_base/begin.adoc[`begin`] 
| Return an iterator to the beginning

| xref:boost/urls/params_base/buffer.adoc[`buffer`] 
| Return the referenced character buffer.

| xref:boost/urls/params_base/contains.adoc[`contains`] 
| Return true if a matching key exists

| xref:boost/urls/params_base/count.adoc[`count`] 
| Return the number of matching keys

| xref:boost/urls/params_base/empty.adoc[`empty`] 
| Return true if there are no params

| xref:boost/urls/params_base/end.adoc[`end`] 
| Return an iterator to the end

| xref:boost/urls/params_base/find.adoc[`find`] 
| Find a matching key


| xref:boost/urls/params_base/find_last.adoc[`find_last`] 
| Find a matching key


| xref:boost/urls/params_base/size.adoc[`size`] 
| Return the number of params

|===
== Static Member Functions

[cols=2]
|===
| Name | Description 

| xref:boost/urls/params_base/max_size.adoc[`max_size`] 
| Return the maximum number of characters possible

|===



== Description


This base class is used by the library    to provide common member functions for    containers. This cannot be instantiated    directly; Instead, use one of the    containers or functions:


=== Containers

* params_ref
    
* params_view
    
* params_encoded_ref
    
* params_encoded_view





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