main.cpp first defined here 解决 .
: UTILS718171_H_) but it doesn't work.The problem might be something like: all c files are compiled and get their own version of the code and then at linkage it causes problem, but I have honestly no idea how to solve this problem.If you define your variables inside your header file and include the header in several c files, you are bound to get multiple definitions error because you break the You are missing the point of #ifndef _FOO_H / #define _FOO_H / #endif construct. Stack Overflow works best with JavaScript enabled Mostly, they then find the error themselves. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Thanks and Happy New Year, Jim 04-08-2011 #2. laserlight. You can, depending on whether your compiler supports So change it back to utils.c and utils.h construct that you had before which, i presume, WAS working and enjoy the software. Show Printable Version; Email this Page… Subscribe to this Thread… 05-18-2018 #1. A non-inline definition belongs in the .cpp file. 全局变量 multiple definition of 问题解决方法 .
Using //export in a file places a restriction on the preamble: since it is copied into two different C output files, it must not contain any definitions, only declarations. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.I get maybe two dozen requests for help with some sort of programming or design problem every day. multiple definition of `xxxxx`错误出现了，MD是不是谁写代码没在.h文件加条件编译啊？仔细查看了代码发现确实加了条件编译。 #ifndef _TEST_H_ #define _TEST_H_ 。。。 #endif 不是这个问题。这个问题哪里引起的呢？重复定义的问题，在哪里出现的呢？ 要解决这个问题先来看看变量的定义和声明的区别。 声 … Hi all, I'm having problems with a shared variable by more than one programs invoked from a main piece of code. Free 30 Day Trial 这个方法虽然可以解决multiple definition的问题，但是却会引发其他问题。 问题如下： 三个文件,a.h,a.c,b.c; 在a.c和b.c 都include了a.h。 在b.c中调用a.c中的函数对a.h中的变量进行赋值，但事实上b.c中的变量仍没被赋值。 问题分析： static的含义是迫使那个变量只在某个文件可见。 假定你在头文件定 …
your coworkers to find and share information. By dayalsoap in forum C++ Programming
common.c:(.text+0x0): multiple definition of `
my Lady enquired. Thread Tools. The Overflow Blog C语言：multiple definition of `XXXX' 关于Linux C multiple definition of‘XXX’的问题 . Apparently the header file should only contain definitions for INLINE functions or objects. utils.h starts withTo be sure my guard was unique I tried changing it (e.g. شامِلٌ لعدَة أشْياء من نَفْس النَّوْع، مُتَعَدِّد If they do, I ask them to find the smallest example that exhibits the problem and send me that. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. I don't see what is special about a function compared to a class definition that requires it to be placed in a cpp file.
Each function must be defined precisely Include guards have nothing to do with this. :
There are three ways to get around the multiple definition problem, each with different implications and costs. Featured on Meta By clicking “Post Your Answer”, you agree to our To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I know that implies that the function will be inlined, but is that the only reason?Although this answer was accepted, it is not the right answer to this question because it misses the entire point: the OP wishes to use a header-only file, with all declarations and definitions in the same file.
I have a C program with several c and h files. multiple definition of `xxxx`问题解决及其原理 . ple (mŭl′tə-pəl) adj. Most have more sense than to send me hundreds of lines of code. If you were to place the function definition in the header, it would imply creating machine code wherever that header was included.
n. A number that may be divided by another number with no remainder: 4, 6, and 12 are multiples of 2. Note that only the machine code that corresponds to functions defined in this cpp and included files gets built as the object (binary) version of this compilation unit (e.g. Extern means that value is defined somewhere else in a .cpp file. If they do, I ask them to find the smallest example that exhibits the problem and send me that. By clicking “Post Your Answer”, you agree to our To subscribe to this RSS feed, copy and paste this URL into your RSS reader. ("Algebra too!"
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multiple definition of c