Sometimes you have a project written in C and you want to add some code (may be open source software) which is provided in C++. So you may want to call a function written in C++ from C. For that purpose, you have to change the function prototype of the concerned C++ function like:
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#ifdef __cplusplus extern "C" { #endif int *some_fancy_function(float *im, int width, int height); #ifdef __cplusplus } #endif |
The ifdefs are only needed, if you are including the header file containing this code into a C and C++ source file!
When it comes to compiling, use the specific compiler like gcc for C code and g++ for C++ code. Compile each sourcefile(s) into a object file like:
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gcc -c myCcode.c g++ -c myCppcode.cpp g++ -o myprojectBinary myCcode.o myCppcode.o |
The last line will link the object files together.
A good tutorial is found here.