Есть виртуальные функции и указатели.
| C++ |
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| #include <string>
#include <sstream>
#include <iostream>
class Exception {
public:
virtual std::string what() const = 0;
private:
};
template <class T>
class SpecialException : public Exception {
public:
SpecialException(const T &value) : data(value) {}
std::string what() const {
std::stringstream result;
result << data;
return result.str();
}
private:
const T data;
};
template <class T>
class A {
public:
A(const T &value) { throw new SpecialException<T>(value); }
};
int main(int argc, char *argv[]) {
try {
A<int> a(12345);
} catch (Exception *e) {
std::cout << e->what() << std::endl;
delete e;
}
try {
A<std::string> a("Text message.");
} catch (Exception *e) {
std::cout << e->what() << std::endl;
delete e;
}
} |
|
