Constructor
<boost/url/param.hpp>
template<class OptionalString>
param(
    core::string_view key,
    OptionalString const& value);
This constructs a parameter with a key and value.
No validation is performed on the strings. Ownership of the key and value is acquired by making copies.
param qp( "key", "value" );
param qp( "key", optional<core::string_view>("value") );
param qp( "key", boost::none );
param qp( "key", nullptr );
param qp( "key", no_value );
this->key == key && this->value == value && this->has_value == true
Linear in key.size() + value.size().
Calls to allocate may throw.
| Name | Description | 
|---|---|
| OptionalString | An optional string type, such as core::string_view,std::nullptr,no_value_t, oroptional<core::string_view>. | 
| Name | Description | 
|---|---|
| key | The key to set. | 
| value | The value to set. |