param_view

A query parameter

Synopsis


                struct param_view                ;

Declared in file <boost/url/param.hpp> at line 404

Member Functions

Name	Description
param_view	Constructor
param_view	Constructor
param_view	Constructor
operator param	Conversion
operator->
param_view

Data Members

Name	Description
key	The key
value	The value
has_value	True if a value is present

Description

Objects of this type represent a single key and value pair in a query string where a key is always present and may be empty, while the presence of a value is indicated by has_value equal to true. An empty value is distinct from no value.

Depending on where the object was obtained, the strings may or may not contain percent escapes.

For most usages, key comparisons are case-sensitive and duplicate keys in a query are possible. However, it is the authority that has final control over how the query is interpreted.

Keys and values in this object reference external 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.

BNF


query-params    = query-param *( "&" query-param )
query-param     = key [ "=" value ]
key             = *qpchar
value           = *( qpchar / "=" )

Specification

Query string (Wikipedia)