Added explicitly defaulted constructor to error class #4
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Since the first template argument of `expected` can not always meet `is_nothrow_move_constructible` (e.g. `HTTPParams`), class `Error` (used with `expected`) needs to meet `is_nothrow_move_constructible` to prevent [the assignment operator of `expect` being defined as deleted](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0323r9.html#expected.object.assign). This actually fixes the build failure with updated expected-lite 0.3.0. Note that `Error(Error&&) = default;` could be sufficient as it would be implicit `noexcept`. The explicit `noexcept` should make the intention more explicit.
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Since the first template argument of
expectedcan not always meetis_nothrow_move_constructible(e.g.HTTPParams), classError(used withexpected) needs to meetis_nothrow_move_constructibleto prevent the assignment operator ofexpectbeing defined as deleted. This actually fixes the build failure with updated expected-lite 0.3.0.Note that
Error(Error&&) = default;could be sufficient as it would be implicitnoexcept. The explicitnoexceptshould make the intention more explicit.