How to use try/catch in C++
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E.18: minimum explicit use of try/catch
Reason (reason)
The structure of try/catch is lengthy, and its non-trivial usage is error-prone. Try/catch can be seen as a signal of non-systematic and low-level resource management or error handling.
Example, Bad (negative example)
Void f (zstring s)
{
Gadget* p
Try {
P = new Gadget (s)
/ /...
Delete p
}
Catch (Gadget_construction_failure) {
Delete p
Throw
}
}
The code is messy. A memory leak may occur in the original pointer in the try code block. Not all exceptions are handled. It is certainly a mistake to delete an object opportunity that failed to build. Better practices:
Void f2 (zstring s)
{
Gadget g {s}
} Alternatives (other options)
Proper resource handles and RAII
Use resource handles and RAII correctly.
Finally
Finally processing
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