On Wed, Mar 28, 2012 at 8:55 PM, Rafael Justo <cadastros@rafael.net.br>wrote:
Hello! This is my first post in this list. =)
I was looking today at Boost Optional (great work!). And I was wondering how could I do something like the bellow code.
-------------------------------- #include <boost/optional.hpp>
class Test {};
boost::optional<Test> get() { return boost::optional<Test>(); }
int main() { if (get() == true) { // OK
} else if (get() == false) { // ERROR }
return 0; } --------------------------------
But there's no "operator==" with bool in optional.hpp, so the above code don't compile (i have checked version 1.49). Is it possible to add the patch described bellow in optional.hpp to solve this problem?
-------------------------------- --- boost_1_49_0/boost/optional/optional.hpp 2010-12-18 19:29:39.000000000 -0200 +++ boost_1_49_0_new/boost/optional/optional.hpp 2012-03-28 16:03:53.417578997 -0300 @@ -616,6 +616,11 @@ return *this ; }
+ bool operator== (const bool condition) + { + return ((*this && condition) || (!*this && !condition)); + } + void swap( optional & arg ) { // allow for Koenig lookup --------------------------------
Best regards, Rafael Justo
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Can you not simply say this? int main() { if (get()) { // OK } else if (!get()) { // ERROR } return 0; } - Rob.