Programmazione C++ moderna: 42 modi per sfruttare al meglio by Scott Meyers

By Scott Meyers

In keeping with programmare in modo davvero efficace con i linguaggi C++11 e C++14 non basta sfogliare qualche nota introduttiva sulle nuove funzionalità (per esempio le dichiarazioni di tipo car, le semantiche di spostamento, le espressioni lambda e il supporto della concorrenza). Occorre imparare a utilizzare queste nuove funzionalità in modo efficace, in line with produrre software program che risulti corretto, efficiente, di facile manutenzione e portabile. Proprio a story esigenza risponde questo manuale, che spiega in modo pratico quali tecniche impiegare according to scrivere software program davvero di alto livello utilizzando i linguaggi C++11 e C++14, ovvero il C++ moderno. Programmazione C++ moderna adotta il rinomato stile basato su indicazioni ed esempi, tipico dei libri di Scott Meyers, introducendo according toò materiale interamente nuovo. Una lettura fondamentale consistent with ogni sviluppatore C++.

Per oltre vent’anni, i libri di Scott Meyers (Effective C++, more suitable C++ ed powerful STL) hanno rappresentato testi di riferimento in keeping with l. a. programmazione in C++. Le sue spiegazioni, chiare e avvincenti, anche del materiale tecnico più complesso lo hanno reso popolare in tutto il mondo, tanto da essere sempre più richiesto according to attività di insegnamento, consulenza e partecipazione a conferenze.

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Additional info for Programmazione C++ moderna: 42 modi per sfruttare al meglio le nuove funzionalità di C++11 e C++14

Example text

Il fatto che cx e rx siano costanti continua a essere rispettato, ma, poiché ora supponiamo che param sia un riferimento a const, non vi è più la necessità che const venga dedotto come parte di T: template void f(const T& param); // ora param un rif-a-const int x = 27; // come prima const int cx = x; // come prima const int& rx = x; // come prima f(x); // T è int, il tipo di param è const int& f(cx); // T è int, il tipo di param è const int& f(rx); // T è int, il tipo di param è const int& Come prima, il fatto che rx sia un riferimento viene ignorato durante la deduzione del tipo.

In questi casi, consultate l’Elemento 4: vedrete come convincere i compilatori a fare quello che volete. Argomenti da ricordare • Durante la deduzione del tipo nei template, gli argomenti che sono riferimenti vengono trattati come non riferimenti: il fatto che siano riferimenti viene ignorato. • Nella deduzione del tipo per i parametri riferimenti universali, gli argomenti lvalue ricevono un trattamento particolare. • Nella deduzione del tipo per parametri passati per valore, gli argomenti const e/o volatile vengono trattati come se fossero non -const e non -volatile.

Questo libro parla di un C++ portabile. Gli Elementi di questo libro sono semplici indicazioni, non regole, poiché le indicazioni prevedono eccezioni. La parte più importante di ciascun Elemento non è il consiglio che offre, ma il ragionamento su cui si basa tale consiglio. Dopo averlo letto, potrete determinare se le specifiche circostanze del vostro progetto giustificano una violazione delle indicazioni fornite nell’Elemento. Il vero obiettivo di questo libro non è quello di dirvi cosa fare e cosa evitare, ma di offrirvi una conoscenza più profonda del modo in cui funzionano le cose in C++11 e C++14.

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