Why are Exception Specifications in C Function Signatures Considered Poor Practice?

Exception Specifications in Function Signatures

Question:

Why is using the "throw" keyword in a function signature considered poor practice in C ?

Answer:

Using the "throw" keyword in a function signature is generally discouraged. Instead, it is recommended to handle exceptions within the function and propagate them through the return value or an error code.

The exception specification in a function signature specifies the exceptions that a function can throw. However, the compiler cannot enforce this declaration. It is checked at runtime, which is undesirable due to its performance implications.

Furthermore, exception specifications are not well-supported by many compilers. For example, Microsoft Visual C ignores exception specifications, except for "throw()", which it interprets as a guarantee that no exceptions will be thrown. This inconsistency adds to the potential problems caused by using exception specifications.

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