Question

I am looking for basic examples/tutorials on:

1. How to write/compile libraries in C++ (.so files for Linux, .dll files for Windows).

2. How to import and use those libraries in other code.

Answer 1

The code

r.cc :

#include 't.h'  int main() {     f();     return 0; } 

t.h :

void f(); 

t.cc :

#include<iostream> #include 't.h'      void f() {     std::cout << 'OH HAI.  I'M F.' << std::endl; } 

But how, how, how?!

~$ g++ -fpic -c t.cc          # get t.o ~$ g++ -shared -o t.so t.o    # get t.so ~$ export LD_LIBRARY_PATH='.' # make sure t.so is found when dynamically linked ~$ g++ r.cc t.so              # get an executable 

The export step is not needed if you install the shared library somewhere along the global library path.