Your lambda params are wrong. You have an array of TSharedPtr<UTileInfo> not of UTileInfo. Change it to this, update the rest of the code to match, and it should fix the compile error.
Thank you so much for the quick reply and suggestions! I tried that previously and still ran into issues. I’ve updated my code to the following, and please see the build output. I’m not really sure what’s going on here, but I feel like I’m close!
TArray<TSharedPtr<UTileInfo>> open;
// sort by f score to target room
open.Sort(&](TSharedPtr<UTileInfo>& a, TSharedPtr<UTileInfo>& b) {
return a->f > b->f;
});
Rebuild started...
1>------ Rebuild All started: Project: rts, Configuration: DebugGame_Editor x64 ------
2>------ Skipped Rebuild All: Project: UE4, Configuration: BuiltWithUnrealBuildTool Win32 ------
2>Project not selected to build for this solution configuration
1>Cleaning rtsEditor and UnrealHeaderTool binaries...
1>Using 'git status' to determine working set for adaptive non-unity build (C:\repo\rts).
1>Creating makefile for rtsEditor (no existing makefile)
1>Parsing headers for rtsEditor
1> Running UnrealHeaderTool "C:\repo\rts\rts\rts.uproject" "C:\repo\rts\rts\Intermediate\Build\Win64\rtsEditor\DebugGame\rtsEditor.uhtmanifest" -LogCmds="loginit warning, logexit warning, logdatabase error" -Unattended -WarningsAsErrors -abslog="C:\Users\gvart\AppData\Local\UnrealBuildTool\Log_UHT.txt" -installed
1>Reflection code generated for rtsEditor in 7.3790333 seconds
1>Building rtsEditor...
1>Using Visual Studio 2019 14.28.29335 toolchain (C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29333) and Windows 10.0.18362.0 SDK (C:\Program Files (x86)\Windows Kits\10).
1>Building 14 actions with 24 processes...
1> [1/14] Default.rc2
1> [2/14] SharedPCH.Engine.NonOptimized.ShadowErrors.cpp
1> [3/14] rts.cpp
1> [4/14] QuadTree.cpp
1> [5/14] rts.init.gen.cpp
1> [6/14] Graph.cpp
1> [7/14] RTSFunctionLibrary.gen.cpp
1> [8/14] RTSFunctionLibrary.cpp
1> [9/14] LevelGenerator.cpp
1> [10/14] LevelGenerator.gen.cpp
1> [11/14] LevelGenTask.cpp
1>C:\software\UE_4.26\Engine\Source\Runtime\Core\Public\Templates/Sorting.h(24): error C2664: 'bool ULevelGenTask::FindPath::<lambda_6a01d443e2166dadc9471417dfaf25a5>::operator ()(TSharedPtr<UTileInfo,ESPMode::NotThreadSafe> &,TSharedPtr<UTileInfo,ESPMode::NotThreadSafe> &) const': cannot convert argument 1 from 'const T' to 'TSharedPtr<UTileInfo,ESPMode::NotThreadSafe> &'
1> with
1>
1> T=TSharedPtr<UTileInfo,ESPMode::NotThreadSafe>
1> ]
1> C:\software\UE_4.26\Engine\Source\Runtime\Core\Public\Templates/Sorting.h(24): note: Conversion loses qualifiers
1> C:\repo\rts\rts\Source\rts\Utility\LevelGenTask.cpp(262): note: see declaration of 'ULevelGenTask::FindPath::<lambda_6a01d443e2166dadc9471417dfaf25a5>::operator ()'
1> C:\software\UE_4.26\Engine\Source\Runtime\Core\Public\Templates/Sorting.h(24): note: while compiling class template member function 'bool TDereferenceWrapper<T,PREDICATE_CLASS>::operator ()(const T &,const T &) const'
1> with
1>
1> T=TSharedPtr<UTileInfo,ESPMode::NotThreadSafe>,
1> PREDICATE_CLASS=ULevelGenTask::FindPath::<lambda_6a01d443e2166dadc9471417dfaf25a5>
1> ]
1> C:\software\UE_4.26\Engine\Source\Runtime\Core\Public\Templates/Invoke.h(51): note: see reference to function template instantiation 'bool TDereferenceWrapper<T,PREDICATE_CLASS>::operator ()(const T &,const T &) const' being compiled
1> with
1>
1> T=TSharedPtr<UTileInfo,ESPMode::NotThreadSafe>,
1> PREDICATE_CLASS=ULevelGenTask::FindPath::<lambda_6a01d443e2166dadc9471417dfaf25a5>
1> ]
1> C:\software\UE_4.26\Engine\Source\Runtime\Core\Public\Templates/Sorting.h(80): note: see reference to class template instantiation 'TDereferenceWrapper<T,PREDICATE_CLASS>' being compiled
1> with
1>
1> T=TSharedPtr<UTileInfo,ESPMode::NotThreadSafe>,
1> PREDICATE_CLASS=ULevelGenTask::FindPath::<lambda_6a01d443e2166dadc9471417dfaf25a5>
1> ]
1> C:\software\UE_4.26\Engine\Source\Runtime\Core\Public\Containers/Array.h(2506): note: see reference to function template instantiation 'void Sort<TSharedPtr<UTileInfo,ESPMode::NotThreadSafe>,PREDICATE_CLASS>(T *,const int32,const PREDICATE_CLASS &)' being compiled
1> with
1>
1> PREDICATE_CLASS=ULevelGenTask::FindPath::<lambda_6a01d443e2166dadc9471417dfaf25a5>,
1> T=TSharedPtr<UTileInfo,ESPMode::NotThreadSafe>
1> ]
1> C:\repo\rts\rts\Source\rts\Utility\LevelGenTask.cpp(262): note: see reference to function template instantiation 'void TArray<TSharedPtr<UTileInfo,ESPMode::NotThreadSafe>,FDefaultAllocator>::Sort<ULevelGenTask::FindPath::<lambda_6a01d443e2166dadc9471417dfaf25a5>>(const PREDICATE_CLASS &)' being compiled
1> with
1>
1> PREDICATE_CLASS=ULevelGenTask::FindPath::<lambda_6a01d443e2166dadc9471417dfaf25a5>
1> ]
1> C:\repo\rts\rts\Source\rts\Utility\LevelGenTask.cpp(260): note: see reference to function template instantiation 'void TArray<TSharedPtr<UTileInfo,ESPMode::NotThreadSafe>,FDefaultAllocator>::Sort<ULevelGenTask::FindPath::<lambda_6a01d443e2166dadc9471417dfaf25a5>>(const PREDICATE_CLASS &)' being compiled
1> with
1>
1> PREDICATE_CLASS=ULevelGenTask::FindPath::<lambda_6a01d443e2166dadc9471417dfaf25a5>
1> ]
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.MakeFile.Targets(54,5): error MSB3073: The command "C:\software\UE_4.26\Engine\Build\BatchFiles\Rebuild.bat rtsEditor Win64 DebugGame -Project="C:\repo\rts\rts\rts.uproject" -WaitMutex -FromMsBuild" exited with code -1.
1>Done building project "rts.vcxproj" -- FAILED.
========== Rebuild All: 0 succeeded, 1 failed, 1 skipped ==========
