C++ Class diagram and {query}

Question

I am trying to learn UML class diagrams + c++ and I stumbled upon {query} being used after operation. For example class diagram in picture does have {query} after operation.

Notice that I the (ref symbol) means & symbol (const std::string&) . What would {query} look code wise? Any tips?

Constructor is supposed to save parameter to attribute and then member function would return it.

Thank you in advance.

Answer 1

According to p. 116 of UML 2.5:

<oper-property> indicates the properties of the Operation.

<oper-property>::= 'redefines' <oper-name> | 'query' | 'ordered' | 'unordered' | 'unique' | 'nonunique' | 'seq' | 'sequence' | <oper-constraint>

where

• 'query' means that the Operation does not change the state of the system.

Basically you just can think of that as implementation of a property.