params_base::contains

Return true if a matching key exists.

Synopsis

bool
contains(
    string_view key,
    ignore_case_param ic = {}) const;

Description

This function examines the parameters in the container to find a match for the specified key. The comparison is performed as if all escaped characters were decoded first.

Example

assert( url_view( "?first=John&last=Doe" ).params().contains( "first" ) );

Complexity

Linear in this->buffer().size().

Exception Safety

Throws nothing.

Parameters

Name	Description
`key`	The key to match. By default, a case-sensitive comparison is used.
`ic`	An optional parameter. If the value `ignore_case` is passed here, the comparison will be case-insensitive.