C ++ 11与C ++ 03相比有什么好处？ [英] What benefits does C++11 bring in comparison to C++03?

问题描述

我将在一个月内开始学习C ++ 11，并且想知道，与C ++ 03相比，C ++ 11有什么好处？

解决方案

如果我不得不指出两件事情，我会说rvalue引用和可变参数模板是C ++ 11超过C ++ 03的最深刻的改进。两者都可以让你做真正的应该一直可能的事情，并增加巨大的表达力的语言。最后，你可以有一个适当的 unique_ptr 和移动语义的容器由于右值引用，和直接构造而不是复制构造感谢两个建设和谐玩：

 模板< typename ... Args> 
 void construct（void * p，Args& ... args）
 {
 :: new（p）T（std :: forward& 。）; 
} 
  

另一个巨大的改进是将内存模型合并到语言中，对并发执行（多线程）的标准化描述。

有许多小的添加，使得语言更具表现力，并允许你做简单的事情以前无法执行：

• 括号初始化允许初始化类成员数组和值构建自动对象。 p>




• 初始值列表允许初始化容器。

/ p>


• 为类和联合体指定了更好的内存布局，以及细致的微不足道概念，以尽可能优化。





• lambda表达式和闭包使算法和函数式编程更容易，更可行。

  I will start studying C++11 in a month and was wondering, what benefits does C++11 provide when compared to C++03?

  解决方案

  If I had to nail it down to two things, I'd say that "rvalue references and variadic templates" are the most profound improvement of C++11 over C++03. Both allow you to do things that really should have been possible all along, and add enormous expressive power to the language. Finally you can have a proper unique_ptr and containers with move semantics thanks to rvalue references, and direct construction rather than copy construction thanks to both constructions playing in harmony:

  template <typename ...Args>
  void construct(void * p, Args &&... args)
  {
      ::new (p) T(std::forward<Args>(args)...);
  }
  

  Another huge improvement is the incorporation of a memory model into the language that allows for a standardized description of concurrent execution (multi-threading).

  There are tons of smaller additions that make the language more expressive, though, and allow you to do things you simply couldn't do previously:

  • brace-initialization allows you to initialize class member arrays and value-construct automatic objects.

  • initializer lists allow you to initialize containers.

  • a better concept of constant expressions.

  • a better-specified memory layout for classes and unions, as well as fine-grained notions of "triviality" to allow optimizations as much as possible.

  • lambda expressions and closures make algorithmic and functorial programming much easier and more viable.

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