Return true if a matching key exists
Synopsis
Declared in header <boost/url/params_base.hpp>
bool
contains(
core::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. 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 is case-insensitive. |