The key concerns of the C++ programming language

As far as developers are concerned, the three key concerns that C++ programming language designers keep in mind were (and still are) as follows:

• Zero Cost Abstraction - No performance penalty for higher level abstraction
• Expressivity - A user defined type (UDT) or class should be as expressive as built-in types
• Substitutability - A UDT can be substituted wherever built-in-types are expected (as in generic data structures and algorithms)

We will discuss these briefly.