std::error_code error_from_exception(std::exception_ptr &&ep = std::current_exception(), std::error_code not_matched = std::make_error_code(std::errc::resource_unavailable_try_again)) noexcept
This function saves writing boilerplate by rethrowing ep within a try
block, with a long sequence of catch() handlers, one for every standard
C++ exception type which has a near or exact equivalent code in
std::errc
.
If matched, ep is set to a default constructed
std::exception_ptr
,
and a
std::error_code
is constructed using the ADL discovered free
function make_error_code() upon the std::errc enumeration value matching the
thrown exception.
If not matched, ep is left intact, and the not_matched error code supplied
is returned instead.
Overridable: Not overridable.
Requires: C++ exceptions to be globally enabled.
Namespace: BOOST_OUTCOME_V2_NAMESPACE
Header: <boost/outcome/utils.hpp>