By Alan Ezust
Research C++, styles, and Qt four Cross-Platform DevelopmentMaster C++ and layout styles jointly, utilizing the world's best open resource framework for cross-platform improvement: Qt 4.An creation to layout styles in C++ with Qt four is a whole educational and reference that assumes no earlier wisdom of C, C++, gadgets, or styles. you will stroll via each middle inspiration, one step at a time, studying via an intensive choice of Qt 4.1-tested examples and exercises.By the time you are performed, you will be developing multithreaded GUI purposes that entry databases and control XML documents - purposes that run on systems together with home windows, Linux, Unix, and Mac OS X. better of all, you will be writing code that is effective, reusable, and elegant.Learn gadgets quick: periods, inheritance, polymorphism, and moreMaster strong layout patternsDiscover effective high-level programming suggestions utilizing libraries, generics, and containersBuild graphical functions utilizing Qt widgets, versions, and viewsLearn complicated recommendations starting from multithreading to reflective programmingUse Qt's integrated periods for gaining access to MySQL dataIncludes a whole C++ language reference
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Additional resources for An Introduction to Design Patterns in C++ with Qt 4
It makes sure that the file specified by the user does not already exist (or that it is all right to overwrite it if it does exist) before opening it for output. • It makes sure that the file exists before attempting to read from it. (Hint: After the call to open, you can test the ifstream variable as if it were a bool. 11. " const can be applied usefully in a large number of programming situations, as we will soon see. Because it cannot be assigned to, a const object must be properly initialized.
The new operator allocates storage from the memory heap (also called the heap, free pool, or free storage) and returns a pointer to the newly allocated object. 9). In general, the code that calls new should document, or be physically located near, the code that frees the memory. The goal is to keep memory management code as simple and reliable as possible. The delete operator releases dynamically allocated memory and returns it to the memory heap. delete should be applied only to pointers returned by the new, or to null pointers.
Pointers can seem complicated at first. We discuss pointer use and misuse in more detail in Chapter 22. 1. The Unary Operators & and * A variable is an object with a name recognized by the compiler. A variable's name can be used as if it is the object itself. For example, if we say: int x = 5; we can use x to stand for the integer object whose value is 5, and we can manipulate the integer object directly through the name x. For example: ++x ; // symbol x now refers to an integer with value 6 An object (in the most general sense) is a chunk of memory that can hold data.
An Introduction to Design Patterns in C++ with Qt 4 by Alan Ezust