Practical C++ Programming Copyright 2003 O'Reilly and Associates Page1
Short summary:
Following these two steps you have a C+1/2 program. It works but. it s really a C program in C++ s clothing. To convert it to a real C++ ...
Long summary:
Practical C++ Programming Copyright 2003 O'Reilly and Associates Page1Page 1Practical C++ ProgrammingCopyright 2003 O'Reilly and AssociatesPage1Chapter 27From C to C++Page 2Practical C++ ProgrammingCopyright 2003 O'Reilly and AssociatesPage2UpgradingThere is a lot of C code out there. It is 95%compatible with C++.That s why we re studying the other 5%.Page 3Practical C++ ProgrammingCopyright 2003 O'Reilly and AssociatesPage3K&R Style Functions{// Body of the functionchar *name;int function;{// Body of the functionint funct(...); // Default prototype for class C functionsi = do_it();i = do_it(1 2 3);i = do_it("Test" 'a');Page 4Practical C++ ProgrammingCopyright 2003 O'Reilly and AssociatesPage4enum struct union andclassC++struct sample {int ij; // Data for the sample};sample sample_var; // Last sample seenCstruct sample sample_var; // Legal in Csample sample_var; // Illegal in C Page 5Practical C++ ProgrammingCopyright 2003 O'Reilly and AssociatesPage5malloc and freeC s version of new is malloc:foo_var = (struct foo *)malloc(sizeof(struct foo));and calloc (calloc zeros the data)foo_var = (struct foo*)calloc(3 sizeof(foo));/* C++ usesfoo_var = new foo3] */C++ malloc trap:class foo {...};foo_var = (struct foo *)malloc(sizeof(struct foo));// Don't code like thisWARNING: This creates the class without calling the constructor.free((char *)foo_var);foo_var = NULL;WARNING: This destroys the class without calling the destructor.Page 6Practical C++ ProgrammingCopyright 2003 O'Reilly and AssociatesPage6Turning Structures intoClassesStructure reading and writinga_struct struct_var;// Perform a raw read to read in the structureread_size = read(fd (char *)&struct_var sizeof(struct_var));// Perform a raw write to send the data to a filewrite_size = write(fd (char *)&struct_var sizeof(struct_var));Class reading and writing (NOT)class sample {public:sample(void) : sample_size(100) {} // Set up classvirtual void get_sample(); // Routine to get a ...
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