the objective c standard library

... constants). Based on the visible form of the c files. Digits Occurrence Digits Occurrence Digits Occurrence Digits Occurrence C supports the representation of constants in the base chosen by evolution ... of the.c files. Token Sequence % Occurrence of First Token % Occurrence of Second Token Token Sequence % Occurrence of First Token % Occurrence of Second Token This defines the terms significand ... introduced in C90 1 base is often used to denote what the standard calls a decimal constant, which corresponds to the common case When they occur in source, both octal and hexadecimal constants

Ngày tải lên: 20/10/2013, 10:15

... Numeric, which are mutating algorithms that produce numeric results • In addition to these main types, there are specific algorithms within each type that accept a predicate condition – Predicate ... numeric STL Container Overview • STL containers are Abstract Data Types (ADTs) • All containers are parameterized by the type(s) they contain • Each container declares various traits • Each container ... work together in a seamless way. –Alexander Stepanov & Meng Lee, The Standard Template Library What is STL (cont’d)? • A collection of composable class & function templates – Helper class

Ngày tải lên: 30/10/2015, 18:04

... Trang 1The other part of a class’s source is the implementation The @implementation section tells the Objective- C compiler how to make the class actually work This section contains the code that ... each method call The compiler needs to see the entire contents of the class to correctly calculate the location of the instance variables Next on the operating table is Slant6 Create the Slant6.m ... system Xcode will then put newly created files into that directory for you Once you’ve created the files, you can double- click them in the list to edit them Xcode helpfully includes some of the standard

Ngày tải lên: 12/08/2014, 20:22

... directly The final control is a pop- up menu that shows the call stack, which is the current set of active functions If A calls B, and B calls C, C is considered to be at the top of the stack, ... snapshot Control-F Move the cursor forward Control-B Move the cursor backward Control-P Move the cursor to the previous line Control-N Move the cursor to the next line Control-A Move the cursor to the ... to the right Control- (period) Cycle through the completions Shift-control- (period) Cycle backward through the completions Control-/ Move to the next completion placeholder Command-control-S Make

Ngày tải lên: 12/08/2014, 20:22

... object, which is why the retain count can be larger than 1 In the case of the RetainCount1 program, main() owned the RetainTracker object, so main() is responsible for cleaning up the object Recall ... retain count is decreased by 1 When the retain count reaches 0, the object is destroyed The object’s dealloc message is called first, and then its memory is recycled, ready for use by other objects ... NSString *desc = [someObject description]; NSLog (@"%@", desc); [desc release]; There has got to be a better way And luckily, there is! Everyone into the Pool! Cocoa has the concept of the autorelease

Ngày tải lên: 12/08/2014, 20:22

... } @end // CategoryThing After the class declaration come three categories, and each category... NumberConvenience CHAPTER 12: Categories Like the @interface for the category, the @implementation ... dealloc won’t get called until the engine releases the car in its dealloc, and the engine’s dealloc won’t get called until car’s dealloc releases the Engine. They just sit there, staring at each ... object’s attribute Use the @synthesize directive to tell the compiler to generate the implementation for the accessors You can control which instance variable is affected by the generated implementation

Ngày tải lên: 12/08/2014, 20:22

... a new Cocoa Application. Now, we add a new Objective- C class file, which we’ll call AppController, so named because it will be the controlling object for our application Select the Sources folder ... is allocated by sending allocWithZone: to the class of the object that’s receiving this message: Car *carCopy; carCopy = [[[self class] allocWithZone: zone] init]; CarParts-copy contains ... haven’t discussed copy yet The copy method, of course, makes a copy of an object The copy message tells an object to create a brand new object and to make the new object the same as the receiver

Ngày tải lên: 12/08/2014, 20:22

... creates an NSKeyedArchiver instance under the hood; it then passes it to the -encodeWithCodermethod of the object thing1 As thing1 encodes its attributes, it can cause other objects to be encoded, ... strings to describe what piece of object state to change This chapter is all about key-value coding Some of the more advanced Cocoa features, like Core Data and Cocoa Bindings (which we’ll not ... book), use KVC as cogs in their fundamental machinery A Starter Project We’ll be working with our old friend CarParts again Check out the project called 16.01 Car-Value-Coding for the goodies

Ngày tải lên: 12/08/2014, 20:22

... you can’t have an Objective-C class inheriting from std::string. You can put pointers to Objective-C objects into C++ objects Since all Objective-C objects are dynamically allocated, you can’t ... in Xcode, 104bsearch(), 137Build and Go button, 7 C [c] decoration, 305.c file extension, 8 C preprocessor, 93C++, 1–2comparing to Objective-C, 309embedding C++ objects into Objective-C objects, ... The GCC compiler that comes with Xcode supports a hybrid language called Objective-C++ This compiler lets you freely mix C++ and Objective-C code, with a couple of small restrictions You can get

Ngày tải lên: 12/08/2014, 20:22

... expecting this by now! Back into Interface Builder to make the connection from the UIPickerView to the IBOutlet in our view controller Right-click on the UIPickerView, grab the circle next to the ... We’ll come back to the memory management in Chapter 3, we promise InstatwitViewController.m and then add the implementation. What’s next? Trang 2connect the outlet to the codeConnect the picker ... here 4 99objective-c for the iPhone Auto-generated accessors also handle memory management Objective-C on the iPhone doesn’t have a garbage collector, so you have to use reference counting

Ngày tải lên: 14/08/2014, 20:21

... Miami Vice Captain e r c e C p a n The tablevi ew takes the new cell and scrolls it in As the user scrolls, some cells slide off the screen. The cells that are off the view go into a bucket until ... the table view can reuse them when the user scrolls. When the table view has t o scroll a new row onto the scr een, it asks the datasource for a cell f or that row. The datasource check s the ... view, the table view puts space between the sections and shows the section header in bigger letters Take a look at your contact list, then select a contact The first view, where all of your contacts

Ngày tải lên: 14/08/2014, 20:21

... look at the stack in the upper left This is the call stack that led to the crash Here’s the stack at the time of the crash The top 5 frames are framework code, but frame 6 is code we wrote ... directions keys in the view controller, we should clean up the code to start using real constants Create a new file called DrinkConstants.h (File → New then choose Other and a blank file) Add constants ... called key value coding, which is a specific pattern typically used in Cocoa Binding The subtle catch is that NSDictionary usually just turns a call to valueForKey: into a call to objectForKey, and

Ngày tải lên: 14/08/2014, 20:21

... introduction of the general concepts and the utilities that the library uses Then, I describe all the components, each in one or more chapters The first component is the standard template library ... to C+ + and the Standard Library provides a brief overview of the history of the C+ + standard library and the context of its standardization and introduces the concept of complexity • Chapter 3: ... detailed introduction to the concept of the STL, which provides container classes and algorithms that are used to process collections of data The chapter explains step-by-step the concept, the problems,...

Ngày tải lên: 17/02/2014, 22:20

... hide the implicit copy constructor If the type matches exactly, the implicit copy constructor is generated and called For example: template class MyClass { public: //copy constructor ... 12 describe "simple" individual standard classes: • Chapter 10: Special Containers This chapter describes the different special container classes of the C+ + standard library It covers the container ... Standard Library • Chapter 12: Numerics This chapter describes the numeric components of the C+ + standard library In particular, it covers types for complex numbers and classes for the processing...

Ngày tải lên: 19/03/2014, 14:11

... included in the possible set of characters; for simplicity and accuracy the set of characters omitted are listed) no lower-case file scope objects block scope objects function parameters function ... Usability factors include the cognitive resources needed to process an identifier and the semantic associations they evoke, all in the context in which they occur in the visible source (a more ... known as the Ranschburg effect occurs.[574] If occurrences of the same letter are separated by other letters, hrtrb, recall performance for the duplicate letter is reduced (compared to the situation...

Ngày tải lên: 17/10/2013, 19:15

... specifies the type of the allocated object The C library is also included in the C+ + Standard, providing access to the malloc and calloc library functions (which not contain a mechanism for specifying ... greater accuracy However, in some cases the accuracy of the complete calculation may be decreased The issues associated with contracting an expression are discussed elsewhere 968 The FP_CONTRACT pragma ... array of character type, then the effective type of the modified object for that access and for subsequent accesses that not modify the value is the effective type of the object from which the value...

Ngày tải lên: 20/10/2013, 10:15

... which the result is not an integer constant all involve constructs that are new in C9 9 C+ + Like C9 0, the C+ + Standard specifies that the result is a constant The cases where the result is not a constant ... that of the object being assigned to There are also contexts (e.g., the conditional operator) where implicit conversions occur 1296 constraints 1266 C9 0 C+ + The C+ + Standard words its specification ... runtime checks sometimes issue a diagnostic when such an event occurs (Some vendors have concluded that their customers would not accept the high performance penalty incurred in performing this check,...

Ngày tải lên: 24/10/2013, 08:15

... parenthesized value is the percentage of all occurrences of the context that contains the operator) Based on the visible form of the c files Context | other contexts while control-expression for control-expression ... difference may result in values being accessed from registers in C9 0 while they will be accessed from storage in C9 9 C+ + The C+ + Standard explicitly specifies the behavior for creating a composite ... on whether the two pointers have compatible types Given the declarations const void *c_ vp; void *vp; const int *c_ ip; volatile int *v_ip; int *ip; const char *c_ cp; the third column in the following...

Ngày tải lên: 24/10/2013, 08:15

... sufficient to change to any associated object declarations) In practice the bulk of the costs associated with such a change are created by the need to modify the operators used to access the object ... visible, a declaration of U_1 */ C9 0 The C9 9 Standard more clearly specifies the intended behavior, which had to be inferred in the C9 0 Standard C+ + The C+ + Standard specifies this behavior for class ... syntax C+ + The term tag is not used in C+ +, which calls the equivalent construct a class name Table 1463.1: Occurrence of types declared with tag names (as a percentage of all occurrences of each...

Ngày tải lên: 28/10/2013, 15:15