76 lines
1.4 KiB
C++
76 lines
1.4 KiB
C++
// throw 的限制
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// 在使用 throw 抛出异常信息时，受到函数声明处的 throw() 声明的
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// 可抛出异常类型的限制。
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// 如: 函数内可以抛出任何异常
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#include <iostream>
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using namespace std;
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class A
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{
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public:
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int n;
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public:
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A(int n = 0) : n(n) {}
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};
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// throw() 声明表示不抛出任何异常
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// throw(int, char, double, A) 表示可以抛出 int, char, double, A 类型的异常
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void show(int x) throw(int, char, double, A)
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{
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switch (x)
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{
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case 1:
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throw 0;
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break;
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case 2:
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throw 'a';
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break;
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case 3:
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throw "abc";
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break;
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case 4:
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throw 1.25;
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break;
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case 5:
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throw A(100); // 抛出自定义类的对象
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break;
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// default 可以不写，因为前面已经覆盖了所有情况
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}
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cout << "x = " << x << endl;
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}
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int main()
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{
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cout << "输入一个整数: ";
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int x;
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cin >> x;
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try
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{
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show(x);
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}
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catch (const int &error)
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{
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cout << "捕获异常: " << error << endl;
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}
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catch (const char &error)
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{
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cout << "捕获异常: " << error << endl;
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}
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catch (const char *error)
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{
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cout << "捕获异常: " << error << endl;
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}
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catch (const double &error)
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{
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cout << "捕获异常: " << error << endl;
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}
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catch (const A &error)
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{
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cout << "捕获异常: " << error.n << endl;
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}
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return 0;
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}
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