[IO] Do not loop over base classes of pair since it is an stl template

[mrodozov]

Can we get this commit on 6-12 please, it's related to this request:
https://sft.its.cern.ch/jira/projects/ROOT/issues/ROOT-9995?filter=allopenissues
Cheers,
M.

[phsft-bot]

Can one of the admins verify this patch?

[pcanal]

@phsft-bot build

[phsft-bot]

Starting build on ROOT-performance-centos7-multicore/default, ROOT-fedora27/noimt, ROOT-fedora29/python3, ROOT-ubuntu16/rtcxxmod, mac1014/cxx17, windows10/default
How to customize builds

[phsft-bot]

Build failed on mac1014/cxx17.
See console output.

Errors:

• FAILED: FREETYPE-prefix/src/FREETYPE-stamp/FREETYPE-configure
• CMake Error at /build/jenkins/workspace/root-pullrequests-build/build/FREETYPE-prefix/src/FREETYPE-stamp/FREETYPE-configure-Release.cmake:16 (message):

[phsft-bot]

Build failed on ROOT-fedora27/noimt.
See console output.

Errors:

• FAILED: DAVIX-prefix/src/DAVIX-stamp/DAVIX-build DAVIX-prefix/lib/libdavix.a DAVIX-prefix/lib/libneon.a DAVIX-prefix/lib/libboost_static_internal.a
• CMake Error at /mnt/build/workspace/root-pullrequests-build/build/DAVIX-prefix/src/DAVIX-stamp/DAVIX-build-Release.cmake:16 (message):

Warnings:

• /mnt/build/workspace/root-pullrequests-build/root/core/zip/src/inflate.c:1507:61: warning: left shift of negative value [-Wshift-negative-value]

[phsft-bot]

Build failed on ROOT-performance-centos7-multicore/default.
See console output.

Errors:

• collect2: error: ld returned 1 exit status

[phsft-bot]

Build failed on ROOT-ubuntu16/rtcxxmod.
See console output.

Errors:

• FAILED: : && /usr/bin/c++ -fPIC -pipe -m64 -Wshadow -Wall -W -Woverloaded-virtual -fsigned-char -fPIC -pthread -std=c++11 -O2 -DNDEBUG -Wl,--no-undefined -shared -Wl,-soname,libASImage.so -o lib/libASImage.so graf2d/asimage/CMakeFiles/ASImage.dir/G__ASImage.cxx.o graf2d/asimage/CMakeFiles/ASImage.dir/src/TASImage.cxx.o graf2d/asimage/CMakeFiles/ASImage.dir/src/TASPluginGS.cxx.o -Wl,-rpath,/mnt/build/workspace/root-pullrequests-build/build/lib: lib/libAfterImage.a /usr/lib/x86_64-linux-gnu/libfreetype.so /usr/lib/x86_64-linux-gnu/libgif.so /usr/lib/x86_64-linux-gnu/libtiff.so /usr/lib/x86_64-linux-gnu/libpng.so -l /usr/lib/x86_64-linux-gnu/libjpeg.so /usr/lib/x86_64-linux-gnu/libSM.so /usr/lib/x86_64-linux-gnu/libICE.so /usr/lib/x86_64-linux-gnu/libX11.so /usr/lib/x86_64-linux-gnu/libXext.so lib/libZLIB.a lib/libGraf.so lib/libHist.so lib/libMatrix.so lib/libMathCore.so lib/libImt.so lib/libRIO.so lib/libThread.so lib/libCore.so && :
• collect2: error: ld returned 1 exit status

Warnings:

• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module Core:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module listDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module multimapDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module unordered_multimapDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module setDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module unordered_setDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module vectorDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module mapDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module forward_listDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module valarrayDict:

And 7 more

[phsft-bot]

Build failed on ROOT-fedora29/python3.
See console output.

Errors:

• FAILED: DAVIX-prefix/src/DAVIX-stamp/DAVIX-build DAVIX-prefix/lib/libdavix.a DAVIX-prefix/lib/libneon.a DAVIX-prefix/lib/libboost_static_internal.a
• CMake Error at /mnt/build/workspace/root-pullrequests-build/build/DAVIX-prefix/src/DAVIX-stamp/DAVIX-build-Release.cmake:16 (message):

Warnings:

• /mnt/build/workspace/root-pullrequests-build/root/core/zip/src/inflate.c:1507:61: warning: left shift of negative value [-Wshift-negative-value]

[phsft-bot]

Build failed on windows10/default.
See console output.

[pcanal]

The failures are infrastructure related.