回答編集履歴
1
追記
answer
CHANGED
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@@ -20,4 +20,39 @@
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20
20
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foo f; f = b; // ここで型変換。
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21
21
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f.print();
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22
22
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}
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23
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+
```
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24
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+
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25
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[追記」相互変換? できますとも。
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26
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```C++
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27
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#include <iostream>
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28
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+
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29
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class bar;
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30
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31
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class foo {
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32
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public:
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33
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int n;
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34
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foo(int v=0) : n(v) {}
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35
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void print() { std::cout << "foo(" << n << ")\n"; }
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36
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operator bar();
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37
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};
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38
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39
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class bar {
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40
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public:
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41
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bar(int v=0) : n(v) {}
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42
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int n;
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43
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void print() { std::cout << "bar(" << n << ")\n"; }
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44
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operator foo();
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45
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};
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46
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bar::operator foo() { foo tmp; tmp.n = n; return tmp; }
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48
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foo::operator bar() { bar tmp; tmp.n = n; return tmp; }
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49
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50
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int main() {
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51
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foo f0(123);
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52
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foo f1;
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53
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bar b0(456);
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54
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bar b1;
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55
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f1 = b0; f1.print();
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56
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b1 = f0; b1.print();
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57
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}
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23
58
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```
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