When you include a file into your source file, the preprocessor will include the contents of that file (after taking into account any conditional compilation directives) and, recursively, any files included by that file. As illustrated previously, this could result in thousands of lines of code. As you develop your code, you will often compile the project so that you can test the code. Every time you compile your code, the code defined in the header files will also be compiled even though the code in library header files will not have changed. With a large project, this can make the compilation take a long time.
To get around this problem, compilers often offer an option to precompile headers that will not change. Creating ...
