if not defined
2002年6月29日 — apache for instance... All I get to see in every file is statements like. IF DEFINED this then define that. IF NOT DEFINED THIS THEN DEFINE THAT ,2016年4月6日 — #define a 100 #endif 以上所用的宏中：#undef为解除定义，#ifndef是if not defined的缩写，即如果没有定义。 这就是#if defined 的唯一作用！ ,2019年8月29日 — #if 1 當定義了識別碼時，#ifdef 識別碼語句相當於。The #ifdef identifier statement is equivalent to #if 1 when identifier has been defined. 它相當於 ... ,#ifndef x //if not define的简写. spaceX 关注. 2017.11.06 00:22:25 字数1,424阅读992. #define x ... #endif. 这是宏定义的一种，它可以根据是否已经定义了一个变量 ... ,It is just 'defined' so you can do checks like #ifdef ERROR_FUNCTIONS_H. So if you have #define ERROR_FUNCTIONS_H. You can later do: ,2018年3月13日 — Colleagues (hi Hartmut, Kurt) who maintained a large code base which was extensively configured with #define s ran exactly into the same ... ,2019年8月29日 — If not, the constant EXAMPLE_H is defined to mark EXAMPLE.H as already processed. __has_include. Visual Studio 2017 version 15.3 and later: ... ,2017年8月10日 — #if !defined(MANUF) || !defined(SERIAL) || !defined(MODEL). ,I am currently using Linux CentOS and programming in FORTRAN 90 using Portland 7.1 compiler. I am able to set in the preprocessor directives a flag called ... ,2016年2月12日 — SERVICE_STATUS is a type definition that was defined with typedef ; the answer in your other question contains a link to the documentation of ...
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 if not defined 相關參考資料
#if defined #if not defined.. - CodeGuru Forums
2002年6月29日 — apache for instance... All I get to see in every file is statements like. IF DEFINED this then define that. IF NOT DEFINED THIS THEN DEFINE THAT https://forums.codeguru.com #if defined和#if !defined(c语言的宏定义)_猫叔66的博客-CSDN ...
2016年4月6日 — #define a 100 #endif 以上所用的宏中：#undef为解除定义，#ifndef是if not defined的缩写，即如果没有定义。 这就是#if defined 的唯一作用！ https://blog.csdn.net #ifdef 和#ifndef 指示詞(CC++) | Microsoft Docs
2019年8月29日 — #if 1 當定義了識別碼時，#ifdef 識別碼語句相當於。The #ifdef identifier statement is equivalent to #if 1 when identifier has been defined. 它相當於 ... https://docs.microsoft.com #ifndef x if not define的简写- 简书
#ifndef x //if not define的简写. spaceX 关注. 2017.11.06 00:22:25 字数1,424阅读992. #define x ... #endif. 这是宏定义的一种，它可以根据是否已经定义了一个变量 ... https://www.jianshu.com Define preprocessor value when value not defined - Stack ...
It is just 'defined' so you can do checks like #ifdef ERROR_FUNCTIONS_H. So if you have #define ERROR_FUNCTIONS_H. You can later do: https://stackoverflow.com Generating an error if checked boolean macro is not defined ...
2018年3月13日 — Colleagues (hi Hartmut, Kurt) who maintained a large code base which was extensively configured with #define s ran exactly into the same ... https://stackoverflow.com if, #elif, #else, and #endif directives (CC++) - Microsoft Docs
2019年8月29日 — If not, the constant EXAMPLE_H is defined to mark EXAMPLE.H as already processed. __has_include. Visual Studio 2017 version 15.3 and later: ... https://docs.microsoft.com Preprocessor check if multiple defines are not defined - Stack ...
2017年8月10日 — #if !defined(MANUF) || !defined(SERIAL) || !defined(MODEL). https://stackoverflow.com Use #if not defined with OR boolean logic in preprocessor ...
I am currently using Linux CentOS and programming in FORTRAN 90 using Portland 7.1 compiler. I am able to set in the preprocessor directives a flag called ... https://www.unix.com Using #ifdef or #if defined() to find where a variable is (not ...
2016年2月12日 — SERVICE_STATUS is a type definition that was defined with typedef ; the answer in your other question contains a link to the documentation of ... https://stackoverflow.com |