C-plus-plus coding conventions

The purpose of this document is to define one style of programming in C++. It contains LHCb naming conventions for all C++ entities, such as classes, data members, functions etc. It also contains practical and useful guidelines, including examples, which should be followed when writing C++ code. This will help to ensure understandable and good quality code. Support for training in the form of courses, recomended books and other documentation is also described. This document will be updated regularly as more experience is gained using the C++ language.1