45 lines
651 B
C++
45 lines
651 B
C++
#include <iostream>
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#include <cstring>
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#include <cstdlib>
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using namespace std;
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template <typename T>
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T &maxVal(T &a, T &b)
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{
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return a > b ? a : b;
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}
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class A
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{
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friend A &maxVal<A>(A &a, A &b); // 模板特化的友元函数，用于访问私有成员
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private:
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int x;
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public:
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A(int x) : x(x) {}
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void show()
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{
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cout << "x = " << x << endl;
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}
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};
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// 具体化函数模版的重载
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template <>
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A &maxVal<A>(A &a, A &b) // 模板特化
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{
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if (a.x > b.x)
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return a;
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return b;
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}
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int main()
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{
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A a1(20), a2(50);
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// A &b = maxVal<A>(a1, a2);
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A &b = maxVal(a1, a2);
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b.show();
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return 0;
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}
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