Visitor

Visitor pattern More...

Collaboration diagram for Visitor:

Classes
struct	Component
	accepts a pure virtual Visitor More...
struct	Visitor
	is a pure virtual visitor of Sample_component and other specific components More...
struct	Sample_component
	one of many components is independed from Sample_visitor and implemenation of function visit. More...

Functions
string	client_visit (const forward_list< unique_ptr< Component > > &components, const forward_list< unique_ptr< Visitor > > &visitors)
	knows only virtual visitor and component More...
void	visitor_demo ()

Detailed Description

Visitor pattern

https://refactoring.guru/design-patterns/visitor/cpp/example

Function Documentation

client_visit()

string client_visit	(	const forward_list< unique_ptr< Component > > &	components,
		const forward_list< unique_ptr< Visitor > > &	visitors
	)

knows only virtual visitor and component

Definition at line 469 of file patterns.cpp.

{
    string res;
    for (auto&& comp : components) 
        for (auto&& vis : visitors) {
            res += string(__func__) + " > " + comp->component_accept(*vis.get());
        }
    return res;
}

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visitor_demo()

void visitor_demo

(

)

Call hierarchy:

visitor_demo client_visit component_accept visit component_method

is one of many specific visitors with custom method visit Per each of the possible pairs of Sample_visitor and Sample_component

overloaded function for each component

Definition at line 491 of file patterns.cpp.

{
    struct Sample_visitor
        : public Visitor {
        string visit(const Sample_component& c) const override {
            return string(__func__) + " > " + c.component_method();
        }
    };
 
    forward_list<unique_ptr<Component>> components;
    components.emplace_front(new Sample_component);
    Sample_visitor v;
    forward_list<unique_ptr<Visitor>> visitors;
    visitors.emplace_front(new Sample_visitor);
    assert(client_visit(components, visitors) ==
          "client_visit > component_accept > visit > component_method");
}

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