我应该使用_T还是_TEXT C ++字符串文字？ [英] Should I use _T or _TEXT on C++ string literals?

问题描述

例如：

// This will become either SomeMethodA or SomeMethodW,
// depending on whether _UNICODE is defined.
SomeMethod( _T( "My String Literal" ) );

// Becomes either AnotherMethodA or AnotherMethodW.
AnotherMethod( _TEXT( "My Text" ) );

我看过两者。 _T似乎是为了简洁和_TEXT为了清楚。这只是一个主观的程序员偏好还是更技术性的？例如，如果我使用一个在另一个，我的代码不会编译一个特定的系统或一些旧版本的头文件？

I've seen both. _T seems to be for brevity and _TEXT for clarity. Is this merely a subjective programmer preference or is it more technical than that? For instance, if I use one over the other, will my code not compile against a particular system or some older version of a header file?

推荐答案

SDK的一个简单grep向我们展示，答案是没有关系 - 它们是相同的。它们都变成 __ T（x）。

A simple grep of the SDK shows us that the answer is that it doesn't matter—they are the same. They both turn into __T(x).

C:\...\Visual Studio 8\VC>findstr /spin /c:"#define _T(" *.h 
crt\src\tchar.h:2439:#define _T(x)       __T(x) 
include\tchar.h:2390:#define _T(x)       __T(x)

C:\...\Visual Studio 8\VC>findstr /spin /c:"#define _TEXT(" *.h 
crt\src\tchar.h:2440:#define _TEXT(x)    __T(x) 
include\tchar.h:2391:#define _TEXT(x)    __T(x)

并且为了完整性：

C:\...\Visual Studio 8\VC>findstr /spin /c:"#define __T(" *.h 
crt\src\tchar.h:210:#define __T(x)     L ## x 
crt\src\tchar.h:889:#define __T(x)      x 
include\tchar.h:210:#define __T(x)     L ## x 
include\tchar.h:858:#define __T(x)      x

但是，对于C ++，您应该使用 TEXT（）而不是 _TEXT（） / code>，但它（最终）也扩展到同样的东西。

However, technically, for C++ you should be using TEXT() instead of _TEXT(), but it (eventually) expands to the same thing too.

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