By Davide Di Gennaro
Advanced Metaprogramming in vintage C++ goals to be either an advent and a connection with C++ template metaprogramming (TMP); TMP is gifted within the booklet as a suite of innovations that may carry a brand new variety in C++ and make code tremendously transparent and effective. The publication offers with language facets, layout styles, examples and functions (seen as case studies). distinct emphasis is wear small reusable strategies that might enhance the standard of day-by-day paintings.
What makes the publication remarkable is the extent of figuring out of the recommendations concerned imparted via the writer. this isn't only a rote assessment of metaprogramming. you'll actually comprehend tricky themes like static assertions, the best way to write metafunctions, overload answer, lambda expressions, etc. greater than that, you are going to paintings via them with functional examples guided by means of the author's frank reasons. This e-book calls for you to imagine and to profit and to appreciate the language that you can application at a better level.
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Extra resources for Advanced Metaprogramming in Classic C++
1. Deduction Function templates can deduce their parameters, matching argument types with their signature: template
Occasionally, you may need a meaningful name for an instance, and this may not be so easy, because if the functor has a limited “scope,” the only meaningful name has already been given to the class. end(), is_holiday(myCal)); // is_holiday is a class // how do we name an instance? end(), is_holiday); The reader might want to review the simple example early in this chapter. 1. 4. Generality The best way to improve generality is to reuse standard classes, such as std::pair. This brings in well-tested code and increases interoperability; however, it may often hide some specific logic, for example the meaning of pair::first and pair::second may not be obvious at first sight.
If an object has a member function size(), then a call to empty() is expected to be no slower than size()==0. Note that an object may be empty but still control resources. For example, an empty vector might hold a raw block of memory, where in fact no element has yet been constructed. In particular, it’s unspecified if a clear function will or won’t release object resources; clear is a synonym of reset. To enforce resource cleanup of an auto variable, the usual technique is to swap the instance with a temporary: T x; // now x holds some resources...