error: ‘slots_reference’ was not declared in this scope

[RG2806]

/home/rohan/Pangolin/components/pango_core/include/sigslot/signal.hpp:1180:65: error: ‘slots_reference’ was not declared in this scope
1180 | cow_copy_type<list_type, Lockable> ref = slots_reference();
| ~~~~~~~~~~~~~~~^~
make[2]: *** [CMakeFiles/ORB_SLAM3.dir/build.make:104: CMakeFiles/ORB_SLAM3.dir/src/LocalMapping.cc.o] Error 1
make[2]: *** [CMakeFiles/ORB_SLAM3.dir/build.make:272: CMakeFiles/ORB_SLAM3.dir/src/Frame.cc.o] Error 1
make[2]: *** [CMakeFiles/ORB_SLAM3.dir/build.make:118: CMakeFiles/ORB_SLAM3.dir/src/LoopClosing.cc.o] Error 1
make[2]: *** [CMakeFiles/ORB_SLAM3.dir/build.make:90: CMakeFiles/ORB_SLAM3.dir/src/Tracking.cc.o] Error 1
make[2]: *** [CMakeFiles/ORB_SLAM3.dir/build.make:356: CMakeFiles/ORB_SLAM3.dir/src/G2oTypes.cc.o] Error 1
make[2]: *** [CMakeFiles/ORB_SLAM3.dir/build.make:258: CMakeFiles/ORB_SLAM3.dir/src/Optimizer.cc.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:358: CMakeFiles/ORB_SLAM3.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

[owolabioromidayo]

were you able to fix it?

[RG2806]

yes, you need to change the compiler version in cmakelist.txt from c++11 -> c++14

[maghauke]

@RG2806 Do you mean c++11 - > c++14?

[RG2806]

yes,

[senliontec]

@RG2806 Can you give some more details? Thanks alot.

[rgreid]

This worked for me:

sed -i 's/++11/++14/g' CMakeLists.txt

It's a bit hacky since the demos use #ifdef COMPILEDWITHC11 but it works.

[owlshrimp]

This worked for me:

sed -i 's/++11/++14/g' CMakeLists.txt

It's a bit hacky since the demos use #ifdef COMPILEDWITHC11 but it works.

Do the demos still work? If not, is there a way to make them work?

[rgreid]

Do the demos still work? If not, is there a way to make them work?

They all build fine after sed -i 's/++11/++14/g' CMakeLists.txt and I can confirm the TUM examples execute fine.

[ly-uuu]

This didn't work for me

[bilal-rabbani-ai]

This worked for me:

sed -i 's/++11/++14/g' CMakeLists.txt

It's a bit hacky since the demos use #ifdef COMPILEDWITHC11 but it works.

worked for me

[Mechazo11]

sed -i 's/++11/++14/g' CMakeLists.txt

@rgreid This also worked for me. Thank you so much. But I was wondering, what is this command doing to the CMakeLists ?

[burhanbs]

sed -i 's/++11/++14/g' CMakeLists.txt

@rgreid This also worked for me. Thank you so much. But I was wondering, what is this command doing to the CMakeLists ?

hello Mechazo,
could you please tell me where to add this command in cmakelist.txt. i am confusing..??

thanks alot

[owlshrimp]

sed -i 's/++11/++14/g' CMakeLists.txt

@rgreid This also worked for me. Thank you so much. But I was wondering, what is this command doing to the CMakeLists ?

hello Mechazo, could you please tell me where to add this command in cmakelist.txt. i am confusing..??

thanks alot

This is a command to run in the terminal that will replace "++11" with "++14" in the CMakeLists.txt files. You do not put it in the files themselves.

[jc211]

In CMakeLists.txt, remove

# Check C++11 or C++0x support
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
if(COMPILER_SUPPORTS_CXX11)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
   add_definitions(-DCOMPILEDWITHC11)
   message(STATUS "Using flag -std=c++11.")
elseif(COMPILER_SUPPORTS_CXX0X)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
   add_definitions(-DCOMPILEDWITHC0X)
   message(STATUS "Using flag -std=c++0x.")
else()
   message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
endif()

and add

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_EXTENSIONS OFF)

[Kin-Zhang]

In CMakeLists.txt, remove

# Check C++11 or C++0x support
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
if(COMPILER_SUPPORTS_CXX11)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
   add_definitions(-DCOMPILEDWITHC11)
   message(STATUS "Using flag -std=c++11.")
elseif(COMPILER_SUPPORTS_CXX0X)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
   add_definitions(-DCOMPILEDWITHC0X)
   message(STATUS "Using flag -std=c++0x.")
else()
   message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
endif()

and add

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_EXTENSIONS OFF)

It works for me. Thanks! btw, rem add add_definitions(-DCOMPILEDWITHC11)

# # Check C++11 or C++0x support
# include(CheckCXXCompilerFlag)
# CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
# CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
# if(COMPILER_SUPPORTS_CXX11)
#    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
#    add_definitions(-DCOMPILEDWITHC11)
#    message(STATUS "Using flag -std=c++11.")
# elseif(COMPILER_SUPPORTS_CXX0X)
#    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
#    add_definitions(-DCOMPILEDWITHC0X)
#    message(STATUS "Using flag -std=c++0x.")
# else()
#    message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
# endif()
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_EXTENSIONS OFF)
add_definitions(-DCOMPILEDWITHC11)

[sameer196]

This worked for me:

sed -i 's/++11/++14/g' CMakeLists.txt

I was able to compile and excecute all the demos

[baimo0001]

sed -i 's/++11/++14/g' CMakeLists.txt
This worked for me, but you should use "make" instead of "make -j4". I do not know the reason.