BloombergLP::bslstl::Variant_Base::baseEmplace

Create the alternative with index (template parameter) t_INDEX in place, direct‐initialized from the specified args. If this Variant_Base object already holds a value, that contained value is destroyed before the new object is created. If the alternative is allocator‐aware, it uses the allocator specified upon the construction of this Variant_Base object to supply memory; passing an allocator argument to this method results in two allocators being passed to the alternative constructor, resulting in a likely compilation error. Note that if the constructor of the alternative exits via an exception, this object is left in the valueless by exception state.