How to avoid error handling based on global status in C++

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E.28: avoid error handling based on global state (for example, errno)

Reason (reason)

Global state is hard to manage and it is easy to forget to check it. When did you last test the return value of printf ()?

The global state is difficult to manage and easy to forget to check. When was the last time you checked the return value of printf?

Example, bad (negative example)

Int last_err

Void f (int n)

{

/ /...

P = static_cast (malloc (n * sizeof (X)

If (! P) last_err =-1; / / error if memory is exhausted

/ /...

}

Note (Note)

C-style error handling is based on the global variable errno, so it is essentially impossible to avoid this style completely.

C style error handling is based on the global variable errno, so this style of handling is inherently unavoidable.

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