Re: How on earth did noexcept get through the standards process?
On 2011-04-19 22:40, Alexander Terekhov wrote:
DeMarcus wrote:
On 2011-04-17 09:47, Alexander Terekhov wrote:
DeMarcus wrote:
[...]
a function that must never fail. Take for instance a function that
returns -1 on failure. It may not throw, but it's not a noexcept
function.
A function that is not supposed to throw is a noexcept function.
It depends what you mean with 'supposed'. If you in your semantics
contract want to promise the users of the function that it never
fails you should declare it noexcept. Just declaring a function
I mean
void noexcept_function() noexcept;
int main {
try {
noexcept_function();
}
catch(...) {
throw "impossible!";
}
}
noexcept because it doesn't throw won't help anyone, especially if
you later on decides that the function should be able to fail.
void noexcept_function(bool& failed) noexcept { failed = true; }
is a noexcept function.
That's where we disagree (and I also disagree with the current draft).
To me, the function declaration is the contract with the users of the
function. To me, a thrown exception is a failure. If you put noexcept to
a function I assume this function won't fail. Then you just sneak
through via an input argument telling it failed anyway.
If the only reason to put noexcept at a function is to save a couple of
clock cycles then it's better they rename it 'optimized' to avoid confusion.
This is more clear:
void optimized_function(bool& failed) optimized { failed = true; }
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