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extern "C" isn't (AFAIK) ANSI C, so can't be included in normal C code without the preprocessor guards. In response to your edit: If you are using a C++ compiler, and you declare a function as extern "C" in the header file, you do not need to also declare that function as extern "C" in the implementation file. extern "C" specifies that the function is defined elsewhere and uses the C-language calling convention. The extern "C" modifier may also be applied to multiple function declarations in a block. In a template declaration, extern specifies that the template has already been instantiated elsewhere. extern tells the compiler it can reuse the other Quote: "If you put something like 'int a = 10;' into a header file, each file that includes this header file will have its's own copy of the variable." That is not true if I recollect C / C++ rules correctly; this will just lead to multiple definitions of the same global variable and the linker might complain.
Inc. 1991 ** All rights reserved */ /* ** ctpublic.h - This is the header file for 5.0 CS_INT flag, CS_CHAR *filename, CS_INT fnamelen )); /* ctbind.c */ extern 8 #ifdef __cplusplus. 9 extern "C" { 209 extern int CMlisten_specific (CManager cm, attr_list listen_info);. 210. 220 extern attr_list 584 extern void.
Copyright Compaq Computer Corporation, 2000 * * * * * * The
Last Activity: 18 September 2013, 8:30 PM EDT How do I properly declare extern variables in a C++ header file? 15th April 2021 c++. I currently have a few header files.
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Created April 24, 2015 09:30 In a C++ project including C header inside of an extern "C" block is not recognized in the editor. The code compiles just fine, but all of the code using the symbols in those header files show as error. Also the editor will give the option to auto add the header file outside of the extern "C". I have problem with compiling project when i declare this variable as an extern in header file, but if i declare this in each *.c file as an extern it compiles without errors! I was using other compilers (for other chips e.g. TexasInstr.) and, as far as i remember, with no problems with global varables, but in mplab c32 i have problems. Extern is a keyword in C programming language which is used to declare a global variable that is a variable without any memory assigned to it.
2015-10-17 · i have read that some people do use this "possibility" to store const variables in header files and not use the ram of the mcu. Storing data in FLASH has nothing to do with using header files. Initialisation code must be in a C file, not an H file.
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C Header Files - Header files are helping file of your C program which holds the definitions of various functions and their associated variables that needs to be imported into your C program with the help of pre-processor #include statement.
In your example, you didn't need to write.
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// This is C++ code extern "C" { // Get declaration for f(int i, char c, float x) #include "my-C-code.h" } int main() { f(7, 'x', 3.14); // Note: nothing unusual in the call // >>Moreover, compared to the other macros many C libraries put into their header files 'extern "C"' is really harmless.