expected compilation errors

[isaachier]

Keep seeing this anytime I try to get the result of Extract into a unique_ptr object using std::move.

expected.hpp:666:39: error: could not convert 
‘((opentracing::expected<std::unique_ptr<opentracing::v1::SpanContext> >*)this)- >
opentracing::expected<std::unique_ptr<opentracing::v1::SpanContext>>::contained.opentracing::
expected_detail::storage_t<std::unique_ptr<opentracing::v1::SpanContext>, std::error_code>::error()’ 
from ‘opentracing::expected_detail::storage_t<std::unique_ptr<opentracing::v1::SpanContext>, 
std::error_code>::error_type {aka std::error_code}’ to ‘std::__exception_ptr::exception_ptr’

[rnburn]

Could you also give the line that produces that error?

[isaachier]

Sorry I have been lazy about this. Here is usually the issue:

auto result = tracer->Extract(reader);
auto ctx = std::move(result.value());

[isaachier]

Just confirmed in one of my https://github.com/jaegertracing/cpp-client test cases. That is why my test cases usually do this instead:

auto result = tracer->Extract(reader);
auto ctx = std::unique_ptr<SpanContext>(result->release());

[rnburn]

Thanks. It looks like a problem with the expected-lite library: martinmoene/expected-lite#15.

[isaachier]

I agree thanks for opening the issue.