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1. The Concept of C Macros Macros are generally used to define constant values that are being used repeatedly in program. Macros can even accept arguments and such macros are known as function-like macros. It can be useful if tokens are concatenated into code to simplify some complex declarati...
复制 CMake Error at /opt/cmake/share/cmake-3.20/Modules/CMakeDetermineSystem.cmake:203 (file): file attempted to write a file: /root/examples/chapter03/09-in-source/CMakeFiles/CMakeOutput.log into a source directory. 然而,它仍然创建了提到的文件!因此,我的建议是使用更旧的——但完全支持...
-- Build files have been written to: /root/examples/chapter06/03-odr-success/b [ 33%] Building CXX object CMakeFiles/odr.dir/one.cpp.o [ 66%] Building CXX object CMakeFiles/odr.dir/two.cpp.o [100%] Linking CXX executable odr [100%] Built target odr 或者,我们可以将变量标记为翻译...
You may have noticed that in most of the macro definition examples shown above, each occurrence of a macro argument name had parentheses around it. In addition, another pair of parentheses usually surround the entire macro definition. Here is why it is best to write macros that way. ...
__FUNCTION__, __FUNCDNAME__ and __FUNCSIG__ macros __int128 undefine ? _CRT_SECURE_NO_DEPRECATE has no effect _CRT_SECURE_NO_WARNINGS Seems To Be Inconsistent. _HAS_EXCEPTIONS _tcscpy _USE_32BIT_TIME_T -Embedding in COM server process Command Line .ini file write/read .lib is not ...
Problems with function-like macros At first sight, function-like macros seem like a simple and straight-forward construction. However, when you examine them further you will notice a number of very annoying warts. I will give a number of examples where each of the problems are clearly visible...
In general, I would avoid using X-Macros. That I got an entire blog post out of the technique should show you that they are not obvious, and the caveats I gave above should show you that X-Macros have their own issues. That said, if you have a C codebase that consists of numerous...
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The macros ssSetInputPortSampleTime and ssSetInputPortOffsetTime initialize the input port to have a continuous sample time with an offset of zero. Similarly, ssSetOutputPortSampleTime and ssSetOutputPortOffsetTime initialize the output port sample time to 1 with an offset of zero. Lastly, ss...