O''''''''Reilly Network For Information About''''''''s Book part 68 pptx

... contains the definition for the exception class bad_visit. "boost/variant/static_visitor.hpp" contains the definition for the visitor class template. The following partial synopsis covers ... variant types, only in the form of unions, that exist mainly for C compatibility. Boost.Variant remedies the situation through a class template variant, and accompanying tools for...

Ngày tải lên: 07/07/2014, 08:20

... The type is bound to the object. Therefore, the type of containers can change. An imperfect rule of thumb is that static languages force you to declare variables, but dynamic languages ... different, and convert objects that aren't. The extra syntax provides valuethe compiler has more information to catch bugs earlier. There's a cost, too. Static typing makes you work harder...

Ngày tải lên: 07/07/2014, 08:20

... same syntactic sugar for hashes as for arrays.  Code blocks make iteration tighter and easier. If you're a big Java collections user who's used a dynamic language before, you probably ... 10) = = = 5 => true You get more convenient syntactic sugar. Now, a for loop turns into this: irb(main):021:0> for c in 'g' 'k' irb(main):022:1> puts...

Ngày tải lên: 07/07/2014, 08:20

... always take lessons learned into account), partially due to a lack of performance tuning on the original stack, but mostly due to the fact that the performance gains with Rails are easy to achieve. ... surprised at the level of performance I was able to achieve. The Rails version of the app was fast, and faster even than the original Java version. That's partially due to a bette...

Ngày tải lên: 07/07/2014, 08:20

... approach often makes it much easier to design and refactor complex web screens. For example, here's the rendering for the shopping cart: html divNamed: 'cart' with: [ html small: ... block, so links don't get out of sync. The framework manages them for you.  Seaside is modal. This is the author's word for a continuation server ap proach. Seaside lets...

Ngày tải lên: 07/07/2014, 08:20

... the primary reasons for its success, but sometimes also a formidable source of headaches because of the complexity of certain parts of the language. For instance, the rules for numeric conversions ... the resource still exists. If it doesn't, accessing it wreaks havoc. With weak_ptrs, the information that the shared resource has been destroyed is propagated to all weak_ptrs o...

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... to perform text substitutions. It searches through the input data, finding all matches to the regular expression. For each match of the expression, the algorithm calls match_results::format ... calling regex_replace, we are expected to provide a format string as an argument. This format string determines how the substitution will work. In the format string, it's possible to refer t...

Ngày tải lên: 07/07/2014, 08:20

... already encoded in the type of the container, and redundant information of this kind is typically unnecessary for modern libraries). std: :for_ each( p_statuses.begin(), p_statuses.end(), boost::bind(&status::report,_1)); ... intimidating at first, and by all rights it is because we have yet to define part of the machinery. However, the part to focus on here is where th...

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... produce, and they provide only argument binding, not bindings for expressions. Given that both flexible support for binding arguments and for creating function objects directly from expressions ... constructs (for example, while_loop and for_ loop). "boost/lambda/switch.hpp" defines the lambda equivalent of switch statements. "boost/lambda/construct.hpp" def...

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... [aCircle center]; Section 1.10 gives more information about the -perform: methods. 1.3.6 Categories Objective-C provides the category construct for modifying an existing class "in place." ... you have an implementation section for your category and omit any methods. If you have no implementation at all for a category, this is called declaring an informal protocol. Sect...

Ngày tải lên: 07/07/2014, 08:20