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Những điểm mới của C++11 so với C++. C++11 là một chuẩn mới được cải tiến dựa trên những căn bản của ngôn ngữ lập trình C++....auto variable nullptr Rangebased for loops decltype Uniform Initialization Initializer Lists Override and final Stronglytyped enums Lambdas Smart pointers static_assert and type traits Move semantics rvalue reference thread
From C++ to C++11 Hoàng Mạnh Hưng hung.hoangmanh2@gameloft.com May 2015 What is C++11? Important changes Getting started What is C++11? Important changes Getting started What is C++11? • • ISO Standard approved on August 2011 Other name: C++0x What is C++11? Important changes Getting started Important changes ➢ auto variable ➢ Strongly-typed enums ➢ nullptr ➢ Lambdas ➢ Range-based for loops ➢ Smart pointers ➢ decltype ➢ static_assert and type ➢ Uniform Initialization & Initializer Lists ➢ traits ➢ Move semantics & rvalue reference Override and final ➢ thread auto variable Earlier Version int i = 42; long long l = 42LL; void (*p)(int, float, char) = foo; // void foo(int, float, char) vector::iterator Version11 it = v.begin() // v has type auto vector i = 42; // i has type int auto l = 42LL; // l has type long long auto p = &foo; // p is pointer point to void foo function auto it = v.begin() // v has type vector auto l =[] (int x) -> bool { //l has the typeof a lambda nullptr • • • New keyword Avoid implicit conversion to integral types Has type std::nullptr_t Range-based for loops • So-called “foreach” loop Example 1: for (auto i : {1,2,3,4,5}) { std::cout [...]... 12 Uniform Initialization & Initializer Lists (cont.) class C { int a; int b; int arr[4]; public: C() : arr{1,2,3,4}{} / /C++1 1, member array initializer C(int i, int j) : a(i), b(j){} }; void main() { C c {0,0}; / /C++1 1 only Equivalent to: C c(0,0); int* a = new int[3] { 1, 2, 0 }; /C++1 1 only } 13 Uniform Initialization & Initializer Lists (cont.) • Prevent narrowing: int x1(5.3); // OK, but x1 becomes... decltype(a[0]*b[0]) Tmp; for (int i=0; i return-type {body} • [capture] ● [a,&b] a captured by value, b captured ...What is C++1 1? Important changes Getting started What is C++1 1? Important changes Getting started What is C++1 1? • • ISO Standard approved on August 2011 Other name: C++0 x What is C++1 1? Important... type auto vector i = 42; // i has type int auto l = 42LL; // l has type long long auto p = &foo; // p is pointer point to void foo function auto it = v.begin() // v has type vector... arr{1,2,3,4}{} / /C++1 1, member array initializer C(int i, int j) : a(i), b(j){} }; void main() { C c {0,0}; / /C++1 1 only Equivalent to: C c(0,0); int* a = new int[3] { 1, 2, }; /C++1 1 only } 13