Variant, Implicit Conversions and C++11

[Bryan Catanzaro <bcatanzaro@…>]

With c++11 enabled on g++, the following code compiles on Boost 1.48.0, but not on Boost 1.53.0. It appears the machinery choosing construction method thinks I'm trying to convert from a convertible to an int, rather than from a convertible to a my_variant. If I disable c++11, this code compiles with Boost 1.53.0.

Here's the error: /home/bcatanzaro/boost_1_53_0/boost/variant/variant.hpp:1574:9: error: no matching function for call to ‘boost::variant<int>::initializer::initialize(void*, std::remove_reference<convertible&>::type)’

And here's a reproducer:

#include <boost/variant.hpp>

typedef boost::variant<int> my_variant;

struct convertible {

operator my_variant() const {

return my_variant();

}

};

int main() {

my_variant y = convertible();

}

[Antony Polukhin]

This issue was discussed at mailing lists ​here.

[Antony Polukhin]

Fixed in ​b3650685 develop, will be merged to the master branch as soon as the regression tests will cycle.

[Antony Polukhin]

Test added in ​85d7a5c7, typo fixed in ​9f234aef