Exception handling in C++
Below is an example of exceptions with polymorphism. Throw throws an object of a class( can be derived from std::exception).what is an operator of this class that returns a const char* .We can use polymorphism to implement a single catch that has an argument as reference to base class. We use multiple derived classes to throw different errors.
#include <iostream>
#include <exception>
// Base Exception class
class BaseException : public std::exception {
public:
const char* what() const noexcept override {
return "BaseException occurred";
}
};
// Derived Exception classes
class DerivedException1 : public BaseException {
public:
const char* what() const noexcept override {
return "DerivedException1 occurred";
}
};
class DerivedException2 : public BaseException {
public:
const char* what() const noexcept override {
return "DerivedException2 occurred";
}
};
void riskyFunction(int type) {
if (type == 1) {
throw DerivedException1();
} else if (type == 2) {
throw DerivedException2();
} else {
throw BaseException();
}
}
int main() {
try {
riskyFunction(1); // Change the parameter to test different exceptions
} catch (const BaseException& e) {
std::cerr << e.what() << std::endl;
}
return 0;
}
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