Re: return type vs passing a reference
On Nov 17, 10:22 am, Ian Collins <ian-n...@hotmail.com> wrote:
Triple-DES wrote:
On 17 Nov, 07:20, Ian Collins <ian-n...@hotmail.com> wrote:
mail....@gmail.com wrote:
If you think the returned object from function may
generate any kind of exception during its construction or
assignment and any kind of memory leak or resource
allocation/deallocation misbehave then it would be better
to use reference technique otherwise you can use return
technique.
Why? The exception is still going to have to be caught.
I think his point is that if the function is a non-const
member function, and the "return t;" may throw (because T's
copy ctor may throw), the object will not be in the same
state as before the operation, making it impossible to give
the strong exception safety guarantee.
I can just as easily say that "passing by reference" may throw
because T's assignment operator may throw.
Yes, but you could do the assignment before removing the object
from the stack, so you'd still have the strong guarantee.
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