I. Converting to ISO Standard C++

You might have programs (or programming habits) that you developed in C or in older versions of C++ and you want to convert to standard C++. This appendix provides some guidelines. Some pertain to moving from C to C++, and others pertain to moving from older C++ to standard C++.

Use Alternatives for Some Preprocessor Directives

The C/C++ preprocessor provides an array of directives. In general, C++ practice is to use those directives that are designed to manage the compilation process and to avoid using directives as a substitute for code. For example, the #include directive is an essential component for managing program files. Other directives, such as #ifndef and #endif, let you control whether particular blocks of code get compiled. The #pragma directive lets you control compiler-specific compilation options. These are all useful, sometimes necessary, tools. You should exercise caution, however, when it comes to the #define directive.