Return true if a matching key exists

Synopsis

Declared in header </boost/url/params_encoded_base.hpp#L267[boost/url/params_encoded_base.hpp,window=blank_]>

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

Description

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

Example

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

Complexity

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

Exception Safety

Exceptions thrown on invalid input.

Return Value

  • bool

Parameters

Name Type

key

pct_string_view

ic

ignore_case_param