Format: Paperback

Language: English

Format: PDF / Kindle / ePub

Size: 9.20 MB

Downloadable formats: PDF

A function returning more than one value has to either: create a class containing as many properties as the values to return, and use it as the return type The latter is commonly used, even in several foundation APIs, such as the error parameter in the following static method from NSData: Note: The case of NSError as the 2nd return value, very frequently used in almost all iOS/MacOS frameworks, can alternatively and more efficiently be implemented in swift using enumerations.

Pages: 466

Publisher: Razeware LLC (October 14, 2015)

ISBN: 1942878125

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((unsigned long long int)buf[6]<<8) buf[7]; } /* ** pack() -- store data dictated by the format string in the buffer ** ** bits signed unsigned float string ** -----+---------------------------------- ** 8 s ** ** (16-bit unsigned length is automatically prepended to strings) */ unsigned int pack(unsigned char *buf, char *format, ...) { va_list ap; signed char c; // 8-bit unsigned char C; int h; // 16-bit unsigned int H; long int l; // 32-bit unsigned long int L; long long int q; // 64-bit unsigned long long int Q; float f; // floats double d; long double g; unsigned long long int fhold; char *s; // strings unsigned int len; unsigned int size = 0; va_start(ap, format); for(; *format != '\0'; format++) { switch(*format) { case 'c': // 8-bit size += 1; c = (signed char)va_arg(ap, int); // promoted *buf++ = c; break; case 'C': // 8-bit unsigned size += 1; C = (unsigned char)va_arg(ap, unsigned int); // promoted *buf++ = C; break; case 'h': // 16-bit size += 2; h = va_arg(ap, int); packi16(buf, h); buf += 2; break; case 'H': // 16-bit unsigned size += 2; H = va_arg(ap, unsigned int); packi16(buf, H); buf += 2; break; case 'l': // 32-bit size += 4; l = va_arg(ap, long int); packi32(buf, l); buf += 4; break; case 'L': // 32-bit unsigned size += 4; L = va_arg(ap, unsigned long int); packi32(buf, L); buf += 4; break; case 'q': // 64-bit size += 8; q = va_arg(ap, long long int); packi64(buf, q); buf += 8; break; case 'Q': // 64-bit unsigned size += 8; Q = va_arg(ap, unsigned long long int); packi64(buf, Q); buf += 8; break; case 'f': // float-16 size += 2; f = (float)va_arg(ap, double); // promoted fhold = pack754_16(f); // convert to IEEE 754 packi16(buf, fhold); buf += 2; break; case 'd': // float-32 size += 4; d = va_arg(ap, double); fhold = pack754_32(d); // convert to IEEE 754 packi32(buf, fhold); buf += 4; break; case 'g': // float-64 size += 8; g = va_arg(ap, long double); fhold = pack754_64(g); // convert to IEEE 754 packi64(buf, fhold); buf += 8; break; case 's': // string s = va_arg(ap, char*); len = strlen(s); size += len + 2; packi16(buf, len); buf += 2; memcpy(buf, s, len); buf += len; break; } } va_end(ap); return size; } /* ** unpack() -- unpack data dictated by the format string into the buffer ** ** bits

The high level of expertise in Ruby of the developers working on this project helped to flatten the learning curve of the adoption of Swift." He added, "Given the great experience we have had with Swift so far, SlideShare will continue using it as its language of choice for iOS development." Meza noted some issues experienced early on, including the lack of a private access modifier in the first few patch releases and initial issues with Xcode syntax highlighting, both of which he said have since been resolved. "With the language itself," he added, "I believe the main issue we experienced was the fact that the language idioms were not yet established when we started using it, so part of our process of learning to work with Swift was coming up with our own conventions for best practices in the use of the language." It’s pretty much accurate, C and C++ are still going to be long on those metrics, especially counting historically iOS 7 Programming Fundamentals: Objective-C, Xcode, and Cocoa Basics download online iOS 7 Programming Fundamentals: Objective-C, Xcode, and Cocoa Basics book. These courses can also be delivered as live, private online classes for groups that are geographically dispersed or wish to save on the instructor's or students' travel expenses Beginning OS X Lion Apps Development (Books for Professionals by Professionals) read online Beginning OS X Lion Apps Development (Books for Professionals by Professionals).

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