By Arunesh Goyal (auth.)
The writer says it top, «I wish to maneuver you, a bit at a time,from knowing C to the purpose the place C++ turns into your mindset». This outstanding booklet is designed to streamline the method of studying C++ in a manner that discusses programming difficulties, why they exist, and the method C++ has taken to unravel such difficulties.
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Additional info for Moving from C to C++: Discussing Programming Problems, Why They Exist, and How C++ Solves Them
As this book uses the standard libraries almost exclusively, you’ll see the following using directive in almost every program: using namespace std; This means that you want to expose all the elements from the namespace called std. After this statement, you don’t have to worry that your particular library component is inside a namespace, since the using directive makes that namespace available throughout the file where the using directive was written. 35 Chapter 2 ■ Making and Using Objects Exposing all the elements from a namespace after someone has gone to the trouble to hide them may seem a bit counterproductive, and in fact you should be careful about thoughtlessly doing this (as you’ll learn later in the book).
This keyword, appropriately enough, is using. All of the Standard C++ libraries are wrapped in a single namespace, which is std (for “standard”). As this book uses the standard libraries almost exclusively, you’ll see the following using directive in almost every program: using namespace std; This means that you want to expose all the elements from the namespace called std. After this statement, you don’t have to worry that your particular library component is inside a namespace, since the using directive makes that namespace available throughout the file where the using directive was written.
Namespaces As mentioned in Chapter 1, one of the problems encountered in the C language is that you “run out of names” for functions and identifiers when your programs reach a certain size. Of course, you don’t really run out of names; it does, however, become harder to think of new ones after awhile. More importantly, when a program reaches a certain size, it’s typically broken up into pieces, each of which is built and maintained by a different person or group. Since C effectively has a single arena where all the identifier and function names live, this means that all the developers must be careful not to accidentally use the same names in situations where they can conflict.