Download E-books Effective Modern C++: 42 Specific Ways to Improve Your Use of C++11 and C++14 PDF

Posted On March 27, 2017 at 3:07 pm by / Comments Off on Download E-books Effective Modern C++: 42 Specific Ways to Improve Your Use of C++11 and C++14 PDF

By Scott Meyers

Coming to grips with C++11 and C++14 is greater than an issue of familiarizing your self with the gains they introduce (e.g., auto variety declarations, stream semantics, lambda expressions, and concurrency support). The problem is studying to exploit these gains effectively—so that your software program is right, effective, maintainable, and transportable. That’s the place this functional ebook is available in. It describes the way to write actually nice software program utilizing C++11 and C++14—i.e. utilizing modern C++.

Topics include:

  • The professionals and cons of braced initialization, noexcept requisites, ideal forwarding, and clever pointer make functions
  • The relationships between std::move, std::forward, rvalue references, and common references
  • Techniques for writing transparent, right, effective lambda expressions
  • How std::atomic differs from volatile, how each one may be used, and the way they relate to C++'s concurrency API
  • How top practices in "old" C++ programming (i.e., C++98) require revision for software program improvement in sleek C++

Effective sleek C++ follows the confirmed guideline-based, example-driven layout of Scott Meyers' prior books, yet covers totally new material.

"After I realized the C++ fundamentals, I then discovered easy methods to use C++ in creation code from Meyer's sequence of potent C++ books. Effective sleek C++ is crucial how-to publication for suggestion on key directions, kinds, and idioms to take advantage of glossy C++ successfully and good. do not personal it but? purchase this one. Now".
-- Herb Sutter, Chair of ISO C++ criteria Committee and C++ software program Architect at Microsoft

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Std::vector::size_type is special to be an unsigned critical variety, so loads of programmers determine that unsigned is nice sufficient and write code corresponding to the above. this may have a few fascinating effects. On 32-bit home windows, for instance, either unsigned and std::vector::size_type are an analogous dimension, yet on 64-bit home windows, unsigned is 32 bits, whereas std::vec tor::size_type is sixty four bits. which means code that works less than 32-bit home windows might behave incorrectly lower than 64-bit home windows, and whilst porting your software from 32 to sixty four bits, who desires to spend time on concerns like that? utilizing automobile guarantees that you simply don’t need to: car sz = v. size(); // sz's sort is std::vector::size_type nonetheless uncertain concerning the knowledge of utilizing automobile? Then give some thought to this code: std::unordered_map m; … for (const std::pair& p : m) { … // do anything with p } forty | merchandise five This seems to be completely average, yet there’s an issue. Do you spot it? spotting what’s amiss calls for remembering that the main a part of a std::unor dered_map is const, so the kind of std::pair within the hash desk (which is what a std::unordered_map is) isn’t std::pair, it’s std::pair . yet that’s no longer the sort declared for the variable p within the loop above. accordingly, compilers will try to discover the way to convert std::pair items (i. e. , what’s within the hash desk) to std::pair items (the declared variety for p). They’ll prevail through making a transitority item of the kind that p desires to bind to via copying every one item in m, then binding the reference p to that transitority item. on the finish of every loop new release, the transitority item may be destroyed. in the event you wrote this loop, you’d most likely be stunned by way of this habit, simply because you’d very likely intend to easily bind the reference p to every point in m. Such unintended kind mismatches may be autoed away: for (const car& p : m) { … } // as ahead of this isn't purely extra effective, it’s additionally more uncomplicated to kind. moreover, this code has the very beautiful attribute that for those who take p’s tackle, you’re bound to get a pointer to a component inside m. within the code now not utilizing vehicle, you’d get a pointer to a pace‐ rary object—an item that might be destroyed on the finish of the loop generation. The final examples—writing unsigned if you happen to must have written std::vec tor::size_type and writing std::pair in the event you must have written std::pair—demonstrate how explicitly specifying varieties may end up in implicit conversions that you just neither wish nor anticipate. in the event you use car because the kind of the objective variable, you needn't fear approximately mismatches among the kind of variable you’re stating and the kind of the expres‐ sion used to initialize it. There are therefore a number of purposes to want vehicle over particular kind declarations. but vehicle isn’t excellent. the sort for every automobile variable is deduced from its initializing expres‐ sion, and a few initializing expressions have varieties which are neither expected nor wanted.

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