Download C++ Timesaving Techniques For Dummies (For Dummies by Matthew Telles PDF

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By Matthew Telles

Such a lot books conceal the syntax of the language. This e-book covers a few attention-grabbing how one can use it successfully. particularly, i used to be interested in this ebook for its instance of a category manufacturing facility. no longer an issue lined in so much books.

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However, it would be fairly trivial to implement a ReadAPair method that would retrieve data from a file. 3. Using your code editor, add the code from Listing 4-2 to your source-code file. cpp. c_str()); } }; 26 Technique 4: Inheriting Data and Functionality Once again, you implement a virtual destructor for your class because it’s intended as a base class for inheritance; no point getting specific about what to destroy just yet. You do, however, have a real use for the destructor, because the file pointer that opens in the constructor has to have a corresponding closing instruction (fclose) to free the memory and flush the file to disk.

To fix the problem, the relevant portion of Listing 7-1 should be rewritten. The following step shows you how. ) 1. Modify the source code for the test application as in Listing 7-2. cpp. h” int main(int argc, char **argv) { assert( argc > 1 ); if ( argc > 1 ) printf(“Argument 1 = %s\n”, argv[1] ); return 0; } What is the difference here? Obviously, if you compile the program in debug (that is, non-optimized) mode and run it with no arguments, the assert is triggered and the program exits, kicking out an error statement as before.

Why? A copy is a bitwise copy of all elements in the class. When a copy is made of the FILE pointer in the class, it means you now have two pointers pointing to the same block of memory. Uh-oh. Because you will destroy that memory in the destructor for the class (by calling fclose), the code frees up the same block of memory twice. This is a classic problem that you need to solve whenever you are allocating memory in a class. In this case, you really want to be able to copy the pointer without closing it in the copy.

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