Exception Handling & Error Management Flashcards

What is the purpose of std::nothrow when used with the new operator?

Answer: It makes new return nullptr instead of throwing std::bad_alloc on failure

new(std::nothrow) returns nullptr rather than throwing std::bad_alloc when memory allocation fails.

Which standard exception type should be thrown when a function argument is outside the valid range?

Answer: std::invalid_argument

std::invalid_argument is thrown when a function receives an argument with an invalid value regardless of domain constraints.

What does std::terminate() do by default when called?

Answer: Calls std::abort()

By default, std::terminate() calls std::abort(), which immediately ends the program without stack unwinding.

What happens if no catch handler matches a thrown exception?

Answer: std::terminate() is called directly

If no matching handler is found after searching all active try blocks, std::terminate() is called directly in C++11 and later.

Which of these exception types inherits from std::logic_error?

Answer: std::length_error

std::length_error derives from std::logic_error, as do std::invalid_argument, std::domain_error, and std::out_of_range.

What is a function-try-block used for?

Answer: Wrapping the entire function body including member initializer lists

A function-try-block wraps the entire function including its initializer list, which is the only way to catch exceptions from base/member constructors.

Which of the following is NOT a valid use of catch(...)?

Answer: Accessing the caught exception object's members

catch(...) catches any exception but provides no named object, so you cannot access the exception's members without rethrowing and catching by type.