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Exception Handling in C++
over 9 years ago
While writing programs we always have a chance of exception to occur that needs to be handled in our program.
For exception handling we use the try catch blocks and finally blocks.
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throw: A program throws exception when it occurs.
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catch: A program catches the exception with its type inside this block.
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try: A try block identifies the exception that occurs with its type.
Throwing Exceptions:
Exceptions can be thrown from anywhere in the program using this keyword.
double division(int a, int b) { if( b == 0 ) { throw "Division by zero condition!"; } return (a/b); }Catching Exceptions:
try { // protected code }catch( ExceptionName e ) { // code to handle ExceptionName exception }
Exception Description std::exception An exception and parent class of all the standard C++ exceptions. std::bad_alloc This can be thrown by new. std::bad_cast This can be thrown by dynamic_cast. std::bad_exception This is useful device to handle unexpected exceptions in a C++ program std::bad_typeid This can be thrown by typeid. std::logic_error An exception that theoretically can be detected by reading the code. std::domain_error This is an exception thrown when a mathematically invalid domain is used std::invalid_argument This is thrown due to invalid arguments. std::length_error This is thrown when a too big std::string is created std::out_of_range This can be thrown by the at method from for example a std::vector and std::bitset<>::operator[](). std::runtime_error An exception that theoretically can not be detected by reading the code. std::overflow_error This is thrown if a mathematical overflow occurs. std::range_error This is occured when you try to store a value which is out of range. std::underflow_error This is thrown if a mathematical underflow occurs. #include <iostream> #include <exception> using namespace std; struct MyException : public exception { const char * what () const throw () { return "C++ Exception"; } }; int main() { try { throw MyException(); } catch(MyException& e) { std::cout << "MyException caught" << std::endl; std::cout << e.what() << std::endl; } catch(std::exception& e) { //Other errors } } -
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