Download Advanced Metaprogramming in Classic C++ by Davide Di Gennaro PDF

By Davide Di Gennaro

Advanced Metaprogramming in vintage C++ goals to be either an creation and a connection with C++ template metaprogramming (TMP); TMP is gifted within the e-book as a suite of concepts that might deliver a brand new type in C++ and make code tremendously transparent and effective. The booklet offers with language elements, layout styles, examples and purposes (seen as case studies). distinct emphasis is wear small reusable innovations that might enhance the standard of day-by-day paintings.

What makes the publication unheard of is the extent of knowing of the suggestions concerned imparted through the writer. this isn't only a rote evaluate of metaprogramming. you are going to actually comprehend tough issues like static assertions, tips on how to write metafunctions, overload solution, lambda expressions, etc. greater than that, you are going to paintings via them with useful examples guided via the author's frank reasons. This ebook calls for you to imagine and to benefit and to appreciate the language that you can software at a better level.

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The traditional argument for swap is T&; however, it may make sense to provide more overloads. end()); } }; And even more41: struct unchecked_type_t {}; inline unchecked_type_t unchecked() { return unchecked_type_t(); } template class sorted_vector { // ... 1. swap(t); // now x is empty and t is sorted // later... swap(t, unchecked); // very fast To sum up: • Explicitly qualify std::swap with parameters of fixed native type (integers, pointers, and so on) and standard containers (including string).

For example, in C++ the sum of two int is O(1). In general, the C++ memory model has a finite addressable space (because all objects have a fixed size, and an “address” is an object) and this implies that the number of possible inputs to some algorithms is finite. Quicksort complexity is O(N*log(N)), but std::sort may be formally considered O(1), where—loosely speaking—the constant K is the time required to sort the largest possible array. 39 58 Chapter 1 ■ Templates The first problem to address is how to swap objects of unspecified type T: template class TheClass { T theObj_; // how do you swap two objects of type T?

Deduction Function templates can deduce their parameters, matching argument types with their signature: template struct arg; template void f(arg); template void g(arg); arg a; f(a); // will deduce T = int* arg b; f(b); // will deduce T = const int g(b); // will deduce X = int Deduction also covers non-type arguments: template < int I> struct arg; template arg f(arg); arg<3> a; f(a); // will deduce I=3 and thus return arg<4> However, remember that deduction is done via “pattern matching” and the compiler is not required to perform any kind of algebra20: // this template is formally valid, but deduction will never succeed...

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