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Templates, Exceptions, and RTTI
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null, that employee is not a programmer Otherwise, the print( ) function for that object is invoked The output produced by this program is shown here:
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Constructing employee Constructing programmer Constructing employee Constructing programmer Constructing employee Constructing executive Constructing employee Constructing salesperson Is a programmer Printing programmer object Not a programmer Not a programmer Is a programmer Printing programmer object
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The following program demonstrates the use of reinterpret_cast
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C++ // An example that uses reinterpret_cast #include <iostream> using namespace std; int main() { int i; char *p = "This is a string"; i = reinterpret_cast<int> (p); // cast pointer to integer cout << i; return 0; }
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One final point: Although the traditional casting operator can handle a wide variety of casts, the casting operators just described give you more control over casting This finer-grained control can be a great benefit in today s type-rich programming environments, such as Windows
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Miscellaneous C++ Topics
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Borland C++ Builder: The Complete Reference
his chapter discusses several aspects of C++ not covered in the previous chapters It also looks at some differences between C and C++, as well as some design philosophy
Dynamic Allocation Using new and delete
As you know, C uses the functions malloc( ) and free( ) (among others) to dynamically allocate memory and to free dynamically allocated memory However, C++ contains two operators that perform the functions of allocating and freeing memory in a more efficient and easier-to-use way The operators are new and delete Their general forms are pointer_var = new var_type ; delete pointer_var ; Here, pointer_var is a pointer of type var_type The new operator allocates sufficient memory to hold a value of type var_type and returns an address to it Any data type can be allocated using new The delete operator frees the memory pointed to by pointer_var If an allocation request cannot be filled, the new operator throws an exception of type bad_alloc If your program does not catch this exception, then your program will be terminated While this default behavior is fine for short sample programs, in real-world programs that you write, you should catch this exception and process it in some rational manner To watch for this exception, you must include <new> in your program The actions of new on failure as just described are specified by ANSI/ISO Standard C++ and correctly implemented by C++ Builder The trouble is that not all compilers, especially older ones, will have implemented new in compliance with Standard C++ When C++ was first invented, new returned null on failure Later, this was changed such that new caused an exception on failure Finally, it was decided that a new failure will generate an exception by default, but that a null pointer could be returned instead, as an option Thus, new has been implemented differently, at different times, by compiler manufacturers If you are updating old code, or porting code from another environment, you will need to check all uses of new very carefully Because of the way dynamic allocation is managed, you must use delete only with a pointer to memory that was allocated using new Using delete with any other type of address will cause serious problems There are several advantages to using new instead of malloc( ) First, new automatically computes the size of the type being allocated You don t have to make use of the sizeof operator, which saves you some effort More important, it prevents the wrong amount of memory from being accidentally allocated Second, it automatically returns the correct pointer type you don t need to use a type cast Third, as you will soon see, it is possible to initialize the object being allocated using new Finally, it is possible to overload new (and delete) relative to classes you create, or globally
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