param::param (2 of 6 overloads)

Constructor.

param(
    string_view key,
    std::nullptr_t);

This constructs a parameter with a key and no value. No validation is performed on the strings. Ownership of the key is acquired by making a copy.

param qp( "key" );

this->key == key && this->value == "" && this->has_value == false

Linear in key.size().

Calls to allocate may throw.

Name	Description
`key`	The key to set.