O''''''''Reilly Network For Information About''''''''s Book part 134 docx

... characters for data compression. This algorithm is a way of encoding different characters in different numbers of bits, with the most common characters encoded in the fewest bits. For example, ... two bits for each character. How would the length of an encoded message be affected by using the Huffman code rather than the fixed-length one? 1. Make only one pass through the data fo...

Ngày tải lên: 07/07/2014, 08:20

... ever-rising river for the novice to navigate. My question is this: how high is too high? I think we're already getting too high for most novices. I no longer feel comfortable telling a ... about an alternative to Java. It's different. We're going to take Java for granted just like we take CPUs for granted: it's necessary. It was once the place where all the m...

Ngày tải lên: 07/07/2014, 08:20

... proved to be a problem for adoption for some Smalltalk frameworks. Object- oriented databases are an elegant solution that ignores the current political realities. Don't force structure on ... schemas, as they exist. Forcing a surrogate unique identifier rather than a composite primary key also ignores existing realities. Perform, and scale High database performance is the sin...

Ngày tải lên: 07/07/2014, 08:20

... it a symbol for the Locations class. This method will fire more metaprogramming code that actually adds the properties and methods to your code that will manage the relationships for you. Next, ... in, between the <% and %> tags. First, you'll need to make sure the view has all the information it needs. You'll do this in the edit method, in the controller. Change t...

Ngày tải lên: 07/07/2014, 08:20

... higher-level components. For example, you could take this code: checkoutAddress.showForm( ); if(checkoutAddress.getSeparateBilling) checkoutBilling.showForm( ); creditCardNumber.showForm( ); and ... before you could answer.  To optimize things, you'd have to decide how much information you should keep close bysay, in your briefcaseversus at home, in your filing cabinets....

Ngày tải lên: 07/07/2014, 08:20

... have common code for the framework. Only the last part of the call stack should be different from one continuation to the next. Partial continuations should provide a good performance boost. ... the JRuby project in the months just before publication has made incredible strides. It now passes over 90% of the test cases for the basic Ruby platform. When it reaches Version 1.0 and ca...

Ngày tải lên: 07/07/2014, 08:20

... shared_ptr a general class for handling resource management, rather than "just" handling dynamically allocated objects. There is a small overhead in size for shared_ptr compared to ... use a free function as a factory for shared_ptr<A> here, because the nested deleter class is private to A. Using this scheme, it isn't possible for users to create As on the sta...

Ngày tải lên: 07/07/2014, 08:20

... collection of Ruby programs, libraries, documentations, and binary packages compiled for specific platforms. You can access RAA at http://www.ruby-lang.org/en/raa.html. RAA is still far smaller ... Matsumoto Chapter 6. Ruby Updates 6.2 Changes from 1.6.5 to 1.7.1 The following information details the changes that are occurring in development versions 1.7.1 and 1.8 (...

Ngày tải lên: 07/07/2014, 08:20

... fulfilled for any class to work with Enabling Classes for Use with lexical_cast Because lexical_cast only requires that operator<< and operator>> be suitably defined for the types ... rewarding. When to use lexical_cast:  For conversions from string types to numeric types  For conversions from numeric types to string types  For all lexical conversions that...

Ngày tải lên: 07/07/2014, 08:20

... manually, it's easy to forget one of the overloads for taking one const simple_string& and one const char*. When using the Operators library, you can't forget, because the library ... that's needed for supporting the full set of operators that we aimed for! As you can see, we used a different operator class: addable2. If you're using a compiler that supports p...

Ngày tải lên: 07/07/2014, 08:20