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Constructor.
template< class OptionalString> param( 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<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.
Type |
Description |
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An optional string type, such as |
Name |
Description |
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The key and value to set. |