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Fix lambda return type inference #20457

Merged
merged 1 commit into from
Jul 7, 2022
Merged

Fix lambda return type inference #20457

merged 1 commit into from
Jul 7, 2022

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mrjerryjohns
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Some compilers (some ARM-based Linux compilers) have difficulty inferring the return type of lambdas that don't explicitly state their return type. This causes issues when passing lambdas as arguments into
functions that expect a specific function signature.

This fixes this specific instance in CASEServer that has this problem:

src/protocols/secure_channel/CASEServer.cpp:165:9: error: no viable conversion from '(lambda at src/protocols/secure_channel/CASEServer.cpp:165:9)' to 'TimerCompleteCallback' (aka 'void (*)(chip::System::Layer *, void *)')
        [](auto * systemLayer, auto * appState) {
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/protocols/secure_channel/CASEServer.cpp:165:9: note: candidate template ignored: could not match 'type-parameter-0-1 *' against 'void *'
src/system/SystemLayer.h:145:59: note: passing argument to parameter 'aComplete' here
    virtual CHIP_ERROR ScheduleWork(TimerCompleteCallback aComplete, void * aAppState) = 0;
                                                          ^
1 error generated.

@mrjerryjohns
Fix lambda return type inference
522fd0d 
Some compilers (some ARM-based Linux compilers) have difficulty
inferring the return type of lambdas that don't explicitly state their
return type. This causes issues when passing lambdas as arguments into
functions that expect a specific function signature.

This fixes this specific instance in CASEServer that has this problem.
@mrjerryjohns
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We should merge this into SVE since it's blocking compilation on ARM Linux platforms.

@andy31415 andy31415 added sve and removed request sve labels Jul 7, 2022
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SVE: need to be able to compile in SVE branch for as many targets as possible

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github-actions bot commented Jul 7, 2022 •
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PR #20457: Size comparison from 4f7d5cf to 522fd0d

Increases (6 builds for cc13x2_26x2, cyw30739, efr32, esp32, mbed)
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Decreases (4 builds for cc13x2_26x2, nrfconnect, telink)
platform target config section 4f7d5cf 522fd0d change % change
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Full report (41 builds for cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, p6, telink)
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@woody-apple woody-apple merged commit f1f4d29 into project-chip:master Jul 7, 2022
github-actions bot pushed a commit that referenced this pull request Jul 7, 2022
@mrjerryjohns @web-flow
Fix lambda return type inference (#20457)
4cae0c7 
Some compilers (some ARM-based Linux compilers) have difficulty
inferring the return type of lambdas that don't explicitly state their
return type. This causes issues when passing lambdas as arguments into
functions that expect a specific function signature.

This fixes this specific instance in CASEServer that has this problem.
woody-apple added a commit that referenced this pull request Jul 7, 2022
@woody-apple @mrjerryjohns
Fix lambda return type inference (#20457) (#20467)
fe30b1a 
Some compilers (some ARM-based Linux compilers) have difficulty
inferring the return type of lambdas that don't explicitly state their
return type. This causes issues when passing lambdas as arguments into
functions that expect a specific function signature.

This fixes this specific instance in CASEServer that has this problem.

Co-authored-by: Jerry Johns <johnsj@google.com>
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@tcarmelveilleux tcarmelveilleux tcarmelveilleux approved these changes

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