21 lines
249 B
C++
21 lines
249 B
C++
#include <iostream>
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using namespace std;
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class A {
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public:
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A(int _a) : a(_a){};
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friend int geta(A &ca); ///< 友元函数
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private:
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int a;
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};
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int geta(A &ca) { return ca.a; }
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int main() {
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A a(3);
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cout << geta(a) << endl;
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return 0;
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}
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