Question

我想用宏观方法压缩两条宽体,因此我界定了一些宏观:

#define VERSION_MAJOR 1
#define VERSION_MINOR 1
#define VERSION_BUILD 0
#define VERSION_REVISION 0


#define _STR(s) #s
#define STR(s) _STR(s)

#define _TOWSTRING(x) L##x
#define TOWSTRING(x) _TOWSTRING(x)


//http://stackoverflow.com/questions/240353/convert-a-preprocessor-token-to-a-string
#define PRODUCT_ELASTOS_VERSION STR(VERSION_MAJOR) "." 
                                STR(VERSION_MINOR) "." 
                                STR(VERSION_BUILD) "." 
                                STR(VERSION_REVISION)

now I want to define a new macro PRODUCT_ELASTOS_VERSION_W using macro PRODUCT_ELASTOS_VERSION, it s value should be L"1.1.0.0". so how can I define this macro? TOWSTRING(PRODUCT_ELASTOS_VERSION) is wrong answer.

And if I want to concatenating string, how should I write? L"v" TOWSTRING(PRODUCT_ELASTOS_VERSION) cann t get wide string L"v1.1.0.0".

Answer 1

首先,PRODUCT_ELASTOS_VERSION并不扩大至“1.1.0.0”。

"1" "." "1" "." "0" "." "0"

保持同一结构,你可以确定另一个可扩展至更广阔的识别标志

L"1" L"." L"1" L"." L"0" L"." L"0"

iii

#define _LSTR(s) L ## #s
#define LSTR(s) _LSTR(s)

#define ANOTHER_IDENTIFIER LSTR(VERSION_MAJOR) L"." 
                           LSTR(VERSION_MINOR) L"." 
                           LSTR(VERSION_BUILD) L"." 
                           LSTR(VERSION_REVISION)

友情链接