回答編集履歴
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追記
test
CHANGED
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@@ -87,3 +87,91 @@
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87
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*/
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```
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90
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91
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92
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93
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[追記] こゆこと?
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94
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95
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96
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97
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```C++
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98
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99
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#include <iostream>
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101
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102
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103
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class Operation {
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int last_;
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public:
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int add(int x, int y) { return last_ = x+y; }
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int sub(int x, int y) { return last_ = x-y; }
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int mul(int x, int y) { return last_ = x*y; }
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int last() const { return last_; }
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};
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class Foo {
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Operation* opr_;
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public:
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void set(Operation* opr) {
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opr_ = opr;
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}
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int exec_add(int x, int y) {
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return opr_->add(x, y);
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}
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};
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int main() {
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using namespace std;
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Operation op;
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Foo foo;
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foo.set(&op);
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cout << "1+2= " << foo.exec_add(1,2) << endl;
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cout << "2+3= " << foo.exec_add(2,3) << endl;
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cout << "last result = " << op.last() << endl;
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}
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/* 実行結果
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1+2= 3
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2+3= 5
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last result = 5
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*/
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```
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