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This article mainly introduces "how C++ arranges catch clauses". In daily operation, I believe many people have doubts about how C++ arranges catch clauses. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the questions of "how C++ arranges catch clauses". Next, please follow the editor to study!

E.31: arrange catch clauses correctly

Reason (reason)

Catch-clauses are evaluated in the order they appear and one clause can hide another.

Catch clauses line in the order they represent, and after one clause starts, the other clauses are no longer executed.

Example (sample)

Void f ()

{

/ /...

Try {

/ /...

}

Catch (Base& b) {/ *... * /}

Catch (Derived& d) {/ *... * /}

Catch (...) {/ *... * /}

Catch (std::exception& e) {/ *... * /}

}

If Derivedis derived from Base the Derived-handler will never be invoked. The "catch everything" handler ensured that the std::exception-handler will never be invoked.

If Deriveds is a derived class of Base, the process of capturing the derived class will never be performed. Handling that catches all exceptions causes the handler that catches the std::exception to never execute.

Enforcement (implementation recommendations)

Flag all "hiding handlers".

Mark all hidden exception handlers.

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