By Peter Van Weert, Marc Gregoire
This quickly reference is a condensed reference advisor to the basic info constructions, algorithms, and features supplied via the C++ usual Library. extra particularly, it is a compact number of crucial sessions and services, utilized by C++ programmers each day. The C++ common Library speedy Reference positive factors middle sessions for strings, I/O streams, and diverse commonplace packing containers, in addition to a accomplished set of algorithms to control them. lately, the C++11 and C++14 criteria have further much more effective box periods, a brand new strong commonplace expression library, and a conveyable multithreading library that includes threads, mutexes, variables, and atomic variables. remember that, it really is challenging to grasp and be mindful all of the probabilities, info, and intricacies of this tremendous and turning out to be library. this convenient reference advisor is as a result integral to any C++ programmer. It bargains a condensed, well-structured precis of all crucial features of the C++ commonplace Library, together with all aforementioned performance. No page-long, repetitive examples or imprecise, infrequently used positive aspects. in its place, every thing you want to understand and beware of in perform is printed in a compact, to-the-point kind, interspersed with well-chosen, clarifying examples. The ebook doesn't clarify the C++ language or syntax, yet is out there to someone with simple C++ wisdom. Even the main skilled C++ programmer notwithstanding will study something or from it and locate it an invaluable memory-aid.
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This reference can then be extracted explicitly with get() or implicitly by casting to T&. Because these wrappers can safely be copied, they can be used, for example, to pass references to template functions that take their arguments by value, badly forward their arguments (forwarding is discussed earlier in this chapter), or copy their arguments for other reasons. Standard template functions that do not accept references as arguments, but do work with ref()/cref(), include std::thread() and async() (see Chapter 7), and the std::bind() function discussed shortly.
When converting to text and back. Use (at least) max_digits10 precision when converting floating-point numbers to text, and it will give the exact same value again when parsed back (9 for float, 17 for double, 22 for long double). min_exponent10, min_exponent, max_exponent10, max_exponent The lowest negative (for min_*) or highest positive (for max_*) integer n such that 10n (for *10) or radix n-1 (otherwise) is a valid normalized floating-point value. 0 and the next representable value. round_error() The maximum rounding error as defined in ISO/IEC 10967-1.
Interesting also about the bind() option is that it can bind the target object itself (see b_call_fun_on_s). If that is not required, std::mem_fn() generally results in the shortest code because it deduces the entire type. info CHAPTER 2 ■ GENERAL UTILITIES LAMBDA EXPRESSIONS Although not part of the Standard Library, lambda expressions are such a powerful tool for creating functors that they are well worth a short introduction. In particular, when combined with the algorithms from Chapter 4, the concurrency constructs from Chapter 7, and so on, they often form the basis of very expressive, elegant code.