Error Throwing
rethrow an error using std::rethrow_exception(std::exception_ptr)
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catch (std::exception&)
{
exptr_ = std::current_exception();
}
if (exptr_)
{
// The official interface of std::exception_ptr does not define any move
// semantics. Thus, we copy and reset exptr_ manually.
const auto exptr_copy = exptr_;
exptr_ = nullptr;
std::rethrow_exception(exptr_copy);
}
