每种类型都有相应的字面值吗？ [英] Does every type have a corresponding literal?

问题描述

根据Bjarne Stroustrup的使用C ++的编程原理和实践（第六版，2012年11月），每种类型[ int ， double ， char ， string bool ]有自己的特征样式文字（p.63）。

在本书的A.2中，提到了 int （unsigned; long）和浮点文字的附加变体，以及（null）指针字面量。 / p>

每个类型都有相应的文字吗？

解决方案

Bjarne Stroustrup的使用C ++的编程原理和实践（第六版，2012年11月）指的是 ISO / IEC 14882：2003 作为相关C ++标准。在这里可以找到相关的部分，§2.13，其内容如下：

  
 
有几种字面量。 
 
 literal：
整数文字
字符文字
浮点文字
字符串文字
布尔文字
  

显然，这是一个详尽的列表;并且因为列表中可以有更多类型的文字，答案是：不，不是每个类型都有一个对应的文字。

NB对于C ++ 11，请参见 Lizusek的回答。

According to Bjarne Stroustrup's Programming Principles and Practice Using C++ (Sixth Printing, November 2012), "each of [the] types [int, double, char, string, and bool] has its own characteristic style of literals" (p.63).

In §A.2 of the same book, additional varieties of int (unsigned; long) and floating-point-literals are mentioned, as well as the (null) pointer literal.

Does every type have a corresponding literal?

解决方案

Bjarne Stroustrup's Programming Principles and Practice Using C++ (Sixth Printing, November 2012) refers to ISO/IEC 14882:2003 as the relevant C++ standard. In this can be found the pertinent section, §2.13, which reads as follows:

2.13 Literals

There are several kinds of literals.

literal:
    integer-literal
    character-literal
    floating-literal
    string-literal
    boolean-literal

Apparently, this is an exhaustive list; and because there can be many more types than there are kinds of literal in that list, the answer is: no, not every type has a corresponding literal.

N.B. for the C++11 case, please see Lizusek's answer.

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