Hello! In my example I just used an "else if" statement to test the two cases of the patch that I suggested (both false or both true). Just to make it clear, I don't write this kind of code, It's an illustration of the problem cases. In the company that I work we don't usually use "!" because is to discreet. But now I realized that when you have a NULL object you can just check if it's not null with "!". And I agree with Stewart, this new operator can be confusing for the programmer. The programmer can make a comparison thinking that he is comparing the content of the boost::optional object. Thank you guys for all answers. Best regards, Rafael Justo On Thu, Mar 29, 2012 at 8:21 AM, Stewart, Robert <Robert.Stewart@sig.com>wrote:
Rafael Justo wrote:
[I trimmed your example:]
boost::optional<Test> get();
int main() { if (get() == true) { // OK } else if (get() == false) { // ERROR } }
But there's no "operator==" with bool in optional.hpp, so the above code don't compile (i have checked version 1.49).
I agree with the other posters that such verbosity is unnecessary.
Is it possible to add the patch described bellow in optional.hpp to solve this problem?
+ bool operator== (const bool condition) + { + return ((*this && condition) || (!*this && !condition)); + } +
That would make optionals equality comparable with anything that can be converted to bool, so the following would be valid:
if (get() == 3) // int is convertible to bool { // OK? }
Comparing boost::optional<Test> with int or anything else convertible to bool is inappropriate and was the reason to introduce the Safe Bool Idiom in the first place.
_____ Rob Stewart robert.stewart@sig.com Software Engineer using std::disclaimer; Dev Tools & Components Susquehanna International Group, LLP http://www.sig.com
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