folly::error_or_stopped

Name

Description

error_or_stopped [constructor]

Constructors

operator=

Assigns the "stopped"/cancellation state.

format_to

Implementation of fmt::format and operator<<(ostream&).

get_exception

Implements the folly::get_exception<Ex>(res) protocol.

get_legacy_error_or_cancellation_slow

Extracts the stored error as a legacy exception_wrapper.

get_mutable_exception

Implements the mutable folly::get_mutable_exception<Ex>(res) protocol.

has_stopped

Tests whether this holds the "stopped"/cancellation state.

release_rich_exception_ptr

Moves out the internal rich_exception_ptr, leaving *this moved‐from.

throw_exception [noreturn]

Rethrows the stored error. AVOID: throwing costs upwards of 1usec.

to_exception_ptr_slow

AVOID. Use folly::get_exception<Ex>(r) to check for specific exceptions. It may be OK to add more specific accessors to error_or_stopped, see throw_exception() for an example.

Name

Description

from_current_exception

AVOID. Most code should use result coros, which catch most exceptions automatically. Or, for a stronger guarantee, see result_catch_all.

from_exception_ptr_slow

AVOID. Use error_or_stopped(YourException{...}) if at all possible. Add a std::in_place_type_t<Ex> constructor if needed.

make_legacy_error_or_cancellation_slow

Wraps a legacy exception_wrapper (possibly cancellation) as an error_or_stopped.

Name

Description

folly::operator==

Compares two error_or_stopped values for equality.

folly::result

A value, an error (std::exception_ptr), or a "stopped"/cancellation state.

Name

Description

epitaph

epitaph

or_unwind_epitaph

Syntax sugar for or_unwind(epitaph(...)) on an error‐or‐stopped value.

stack_epitaph

stack_epitaph