O''''''''Reilly Network For Information About''''''''s Book part 27 docx

... take Java for granted just like we take CPUs for granted: it's necessary. It was once the place where all the money was; now it's more of a commodity. 1 .2. 2. 1 .2. 2.1. Complexity ... this higher river of complexity will flood, forcing us to adopt a new abstraction, sooner rather than later. 1 .2. 2 .2. Rapid revolution 1 .2. Boiling Frogs Let's look...

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

... together to form new concepts. The Things That Remain We haven't yet spoken about the remaining part of the Operators library, the iterator helpers. I won't show example code for those, ... is simply a case of adding more overloads. For symmetry, you need to allow either type to be on the left side of the operation. (This is easy to forget when adding operators manually;...

Ngày tải lên: 07/07/2014, 08:20

... perfectly sensible. These two elements are all you need to remember, typewise, for this library: the class any, for storing the values, and the template function any_cast, to retrieve them. ... that can always be performed on the value stored in a propertywe need to retrieve the value first. This implies that if there is a known set of types that are applicable for use with a prope...

Ngày tải lên: 07/07/2014, 08:20

... which is part of another Boost library called Boost.Ref. The following three lines use the variables that we declared earlier, but this time the tuples have an int& element, except for the ... elements in the two tuples. To assign or copy tuples, member-wise assignment or copying is performed, so the two tuples must have the same number of elements. The elements in the source tupl...

Ngày tải lên: 07/07/2014, 08:20

... small function objects created for adapting functions/function objects, and combinations of functions. Although the Standard Library already offers a small part of the functionality found ... function composition in particular. If you used to be one of them, I'm hoping that this chapter has managed to convey some of the tremendous power that is brought forth by the concept as .....

Ngày tải lên: 07/07/2014, 08:20

... m.report(); m.clear(); std: :for_ each(vec.begin(),vec.end(),var(m)=_1); m.report(); } That's all there is to it, but before you think that you've got all this nailed ... var_type<memorizer<int> >::type mem(var(m)); std: :for_ each(vec.begin(),vec.end(),mem=_1); constants can make the expression significantly easier to understand; the same goes for variables...

Ngày tải lên: 07/07/2014, 08:20

... be used, for example, for a GUI control that needs to inform observers that the user changed its value, without having any special knowledge about the clients listening for that information. ... before we knew about Boost.Function, and then convert the code to make use of function, and examine which advantages that brings forth. We will start with a class that supports a simple fo...

Ngày tải lên: 07/07/2014, 08:20