XCode上的size_t [英] size_t on XCode

问题描述

在XCode上，我似乎需要使用std :: size_t而不是Visual C ++上的size_t.但这是一个痛苦，因为我真的不想必须将代码中的每个size_t更改为std::size_t ...在我的Windows代码size_t中可以正常工作而无需包含任何其他文件.

It seems on XCode I need to use std::size_t instead of just size_t on Visual C++. But this is a pain as I don't really want to have to #include <cstddef> and change every size_t to std::size_t in my code... in my Windows code size_t just works without including any additional files.

是否有办法使现有代码在XCode中工作(也许通过.pch文件?)，或者在这方面GCC/MSVC ++根本不同，因此我的代码需要使用std::size_t才能跨平台?

Is there a way to make my existing code work in XCode, (maybe through the .pch file?) or are GCC/MSVC++ fundamentally different in this regard and my code needs to use std::size_t in order to be cross-platform?

推荐答案

根据C ++ 03标准17.4.1.2.4:

According to the C++03 standard, 17.4.1.2.4:

除第18至27条另有规定外，每个标头cname的内容应与相应标头名称.h的内容相同，如ISO/IEC 9899:1990编程语言C(第7条)所规定，或ISO/IEC:1990年编程语言-C修订1:C完整性(第7条)，视情况而定，好像包含在内.但是，在C ++标准库中，声明和定义(在C中定义为宏的名称除外)都在名称空间std的名称空间范围(3.3.5)之内.

Except as noted in clauses 18 through 27, the contents of each header cname shall be the same as that of the corresponding header name.h, as specified in ISO/IEC 9899:1990 Programming Languages C (Clause 7), or ISO/IEC:1990 Programming Languages—C AMENDMENT 1: C Integrity, (Clause 7), as appropriate, as if by inclusion. In the C++ Standard Library, however, the declarations and definitions (except for names which are defined as macros in C) are within namespace scope (3.3.5) of the namespace std.

换句话说，通过选择使用<cstddef>而不是<stddef.h>，您专门要求size_t类型在名称空间std之内.

In other words, by choosing to use <cstddef> instead of <stddef.h>, you're specifically asking for the type size_t to be within the namespace std.

所以，这是选择:

1. 请改用<stddef.h>，因此size_t在顶级名称空间中，如Jesse Good所建议.

1. Use <stddef.h> instead, so size_t is in the top-level namespace, as suggested by Jesse Good.

使用<cstddef>并使用std::size_t.

使用<cstddef>并使用using声明将size_t拉入顶级名称空间.

Use <cstddef> and use a using declaration to pull size_t into the top-level namespace, as suggested by cnicutar.

当然，您可以依靠这样的事实:一个编译器/库/平台的特定版本可以使您摆脱它，或者为每个平台编写不同的代码，或者使用autoconf将整个内容包装起来，或者编写代码生成器或基于sed的预处理器，等等…

Of course you could rely on the fact that one particular version of one compiler/library/platform lets you get away with it, or write different code for each platform, or wrap the whole thing up with autoconf, or write a code generator or sed-based preprocessor, or whatever… but why?

这篇关于XCode上的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！