1669421 - mozilla::Result::andThen does not accept a function that accepts an rvalue reference

Status: RESOLVED FIXED

(Core :: MFBT, defect)

Description

[Simon Giesecke [:sg] [he/him]]

Code like

    Result<int, const char*> r1(10);
    Result<int, const char*> r2 =
        r1.andThen([](int&& x) { return Result<int, const char*>(x + 1); });

does not compile but fails with a substitution failure for the call to andThen.

With C++17, we can now use std::invoke_result_t rather than decltype.

Comment 1

[Simon Giesecke [:sg] [he/him]]

Attachment: Bug 1669421 - Make andThen accept a function that accepts a rvalue reference. r=emilio

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/c5d47bafb1c3
Make andThen accept a function that accepts a rvalue reference. r=emilio

Comment 3

[Bogdan Tara[:bogdan_tara | bogdant]]

https://hg.mozilla.org/mozilla-central/rev/c5d47bafb1c3