Bruce Merry 46dbee7d42 Avoid explicitly resetting a std::[experimental::]optional ... Now that #851 has removed all multiple uses of a caster, it can just use the default-constructed value with needing a reset. This fixes two issues: 1. With std::experimental::optional (at least under GCC 5.4), the `= {}` would construct an instance of the optional type and then move-assign it, which fails if the value type isn't move-assignable. 2. With older versions of Boost, the `= {}` could fail because it is ambiguous, allowing construction of either `boost::none` or the value type.		2017-05-27 23:52:23 +02:00
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pybind11	Avoid explicitly resetting a std::[experimental::]optional	2017-05-27 23:52:23 +02:00