WebJun 20, 2015 · You could get a clear compilation error if you converted the selected argument which is supposed to be a MACRO name to string using # (the pound sign) and compared it's first n characters with the expected prefix and if there is no match, printed an informative error. – AturSams Jan 7, 2014 at 16:01 1 WebMar 2, 2016 · Since you added the C++ tag not using macros is a valid answer. If you just want to talk about the pre-processor just tag it as pre-processor and not C++ – Martin York Nov 22, 2010 at 23:20 15 @Martin: The preprocessor is as much a part of C++ as the STL is; should questions about the STL be tagged [stl] and not [c++] too?
What is the difference between a preprocessor macro with no arguments ...
WebSep 26, 2024 · 1. I'm trying to write a macro that generates code for an object pool for any given class of objects in C. I keep getting error: '#' is not followed by a macro … WebApr 10, 2024 · Macros are expanded by the preprocessor during preprocessing. c. #ifdef, #ifndef, #if, #else, #elif, and #endif: These directives are used for conditional compilation. They allow the preprocessor to include or exclude sections of code based on whether a certain macro is defined or not, or based on the value of an expression. Include Guards fishing in cabo san lucas in june
How to make a variadic macro (variable number of arguments)
WebJun 25, 2016 · To use proper C99 variadic macros, you should be compiling with a C compiler that supports C99 (like gcc), not a C++ compiler, since C++ doesn't have standard variadic macros. – Chris Lutz Mar 25, 2009 at 2:13 Well, I assumed C++ is a super set of C in this regard .. – hasen Mar 25, 2009 at 3:46 Web我正在尝试编写一个带有工作线程的UDP服务器,该工作线程一直在调用GetQueuedCompletionStatus 。 我已经可以使用WSARecvFrom成功接收数据,但使用WSASendTo发送数据会导致以下错误: : The attempted operation is not suppor WebMar 1, 2012 · The C macro system cannot implicitly reference the parameters. You'd have to pass them to it. As a small win macros can count their arguments, so it would be TRACE (foo,bar) instead of TRACE2, TRACE3 etc. That's not significantly worse than writing TRACE () at the start of the function. Actually printing the values would be fine. fishing in cabo san lucas