在linux中定义的是c ++ size_t [英] Where is c++ size_t defined in linux

问题描述

现在我说的是程序员使用typedef关键字的新类型定义。只要我的学生习惯了size_t类型（例如通过使用funciton length（）），我不得不请他们一点努力只是相信它是一个整数类型，我认为它是伟大的

Now I'm talking about new type definition by a programmer using typedef keyword. As long as my pupils are used to the type size_t (for example by using funciton length ()), for which I had to ask them a little effort to just "believe" it is an integer type, I think it woud be great to show noew them where this type is defined.

所以，我在ubuntu框中的/ usr / include中做了很多grep，我看到的是size_t是，反过来，size_type的一个重新定义，反过来又是一个metadata_type的重新定义，这就是这个目录的结束。找不到最后的typedef unsigned int metadata_type;。

So, I've done a lot grep's in /usr/include in an ubuntu box, and what I see is that size_t is, in turn, a redefinition of size_type wich in turn is a redefinition of metadata_type, and that's the end in this directory. Not found the final "typedef unsigned int metadata_type;".

在/ usr / src中找到anohter以前的类型叫yy_size_t，...

In /usr/src I've found anohter previous type called yy_size_t,...

但是，在任何情况下，我一直无法到达链的末端。

But, in any case I've been unable the get to the end of the chain.

有人知道在哪里找到out的最终定义检查，它是一个unsigned int（或类似）？
可能是我错过了一个开发包在我的盒子里？在这种情况下，为什么我能够使用size_t类型编译程序？

Does anyone know where to find out the final definition to check out that it is an unsigned int (or the like)? May be I miss a development package in my box? In this case, why I'm able to compile programs using size_t type?

推荐答案

手动检查C预处理器（ cpp ），并检查输出：

You can try to expand standard include files with the C preprocessor (cpp) by hand and check the output of that:

$ echo '#include <stdlib.h>' | cpp -I/usr/include - > stdlib-expanded.c

你会发现 cpp 甚至包括标记，以指示 stdlib-expanded.c 中的代码已包括在哪些文件中。

You will find that the output of cpp even includes markers to indicate from which files the code in stdlib-expanded.c has been included.

这篇关于在linux中定义的是c ++ size_t的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！