params_ref::count

(Inherited from params_base)

Return the number of matching keys.

Synopsis

std::size_t
count(
    core::string_view key,
    ignore_case_param ic = {}) const;

Description

This function examines the parameters in the container to find the number of matches 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().count( "first" ) == 1 );

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 is case-insensitive.