D1977R0.md

title	document	date	audience	author	toc
LEWG policy on handling errors with OS resource creation	D1977R0	today	Library Evolution	name email Elias Kosunen <[email protected]> name email Jeff Garland <[email protected]> name email Niall Douglas <[email protected]>	false

Introduction {#intro}

There are currently multiple proposals in the library evolution pipeline, including [@P1031R2] and [@P1883R0] Low level file i/o library and [@P1750R1] A Proposal to Add Process Management to the C++ Standard Library. During the review of this papers by LEWGI in Belfast (November 2019), it became apparent that it is presently unclear how errors with creating operating system resources are to be handled. Encouraged by LEWGI, this paper attempts to establish clear guidance on this subject matter, for now and for the future.

Once decided, we propose for this policy to become a part of the future LEWG design policy standing document.

Revision History {#history}

R0

Initial release

Overview of present proposals

Process management (P1750)

Low level file i/o (P1031 and P1883)

Design alternatives

Factory function returning a struct containing an error_code

Factory function returning an expected (P0323)

[@P0323R9]

Includes hand-rolled error

Constructor taking an error_code

Throwing exceptions