Detect compatible types via overload resolution #104
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Use an overload set to detect if a type can be used in a converting constructor or assignment, in a similar way as std::variant. Also fixes the "regression" mentioned in boostorg#100.
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Use an overload set to detect if a type can be used in a converting constructor or assignment, in a similar way as std::variant.
Fix the behavior of is_constructible, is_assignable and is_convertible traits with boost variant reported in #102.
Also fix the "regression" mentioned in #100.