For openSUSE Leap 42.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:rwirth12/openSUSE_Leap_42.3/home:rwirth12.repo
zypper refresh
zypper install eclipse-cpp
For openSUSE Leap 42.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:rwirth12/openSUSE_Leap_42.2/home:rwirth12.repo
zypper refresh
zypper install eclipse-cpp
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:rwirth12/openSUSE_Factory/home:rwirth12.repo
zypper refresh
zypper install eclipse-cpp