Import template

oc create -f templates/s2i-cpp.json

Create app using base C++ image

oc new-app debianmaster/s2i-cpp:latest~https://github.com/debianmaster/s2i-cpp.git --context-dir=/echo --name=my-cpp-app --strategy=source

Creating your own base image

oc new-build https://github.com/debianmaster/s2i-cpp.git --context-dir=dockerfiles/builder --strategy=docker --name=s2i-base

Notes

Creating s2i for c++ is pretty straight forward, select a base image which has all the necessary tools for building c++ application i.e. debianmaster/s2i-cpp or dockerfiles/builder
then in your source code create two files .s2i/bin/run and .s2i/bin/assemble
assemble tells how to compile and run tells how to runt the application. openshift understand these two files and does your build and run.
Advanced build contains steps for eliminating the need for having in the build tools in final run time image. check buildconfigs/advanced folder for more info (not working yet,but will give you idea)