WB3.13 Время жизни объекта

RobertDeMilo

Sep 5th, 2023

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#include <iostream>
#include <vector>
using namespace std;
int ComputeDistance(const string& source, const string& destination)
{
return source.length() - destination.length();
}
class Route
{
public:
Route()
{
source = "Moscow";
destination = "Saint Petersburg";
UpdateLength();
cout << "Default constructed\n";
}
Route(const string& new_source, const string& new_destination)
{
source = new_source;
destination = new_destination;
UpdateLength();
cout << "Constructed\n";
}
~Route()
{
cout << "Destructed\n";
}
string GetSource() const
{
return source;
}
string GetDestination() const
{
return destination;
}
int GetLength() const
{
return length;
}
void SetSource(const string& new_source)
{
source = new_source;
UpdateLength();
}
void SetDestination(const string& new_destination)
{
destination = new_destination;
UpdateLength();
}
private:
void UpdateLength()
{
length = ComputeDistance(source, destination);
}
string source;
string destination;
int length;
};
void Worthless(Route route)
{
cout << 2 << "\n";
}
Route GetRoute()
{
cout << 1 << "\n";
return {}; !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! возвращаем маршрут, созданный при помощи конструктора по умолчанию
}
int main()
{
********************************************************
cout << 1 << "\n";
Route route;
cout << 2 << "\n";
********************************************************
for (int i : {0, 1}) !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
{
cout << "Step " << i << ": " << 1 << "\n";
Route route;
cout << "Step " << i << ": " << 2 << "\n";
}
cout << "End\n";
********************************************************
cout << 1 << "\n";
Route first_route;
if (false)
{
cout << 2 << "\n";
return 0;
}
cout << 3 << "\n";
Route second_route;
cout << 4 << "\n";
********************************************************
cout << 1 << "\n";
Worthless({}); !!!!!!!!!!!!!!!!!!!!!!!!!!!!! маршрут, созданный с помощью конструктора по умолчанию {}
cout << 3 << "\n";
********************************************************
Route route = GetRoute(); !!!!!!!!!!!!!!!!!!!!!!!!!
cout << 2 << "\n"; !!!!!!!!!!!!!!!!!!!!!!!!!
1
Default constructed
2
Destructed
********************************************************
GetRoute(); !!!!!!!!!!!!!!!!!!!!!!!!!
cout << 2 << "\n"; !!!!!!!!!!!!!!!!!!!!!!!!!
return 0;
}

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