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Full Discussion: Conditions/suggestions to use shared library in C/C++ coding
Top Forums Programming Conditions/suggestions to use shared library in C/C++ coding Post 303017464 by Corona688 on Wednesday 16th of May 2018 11:11:22 AM
Old 05-16-2018
Quote:
Originally Posted by yifangt
What are the basic conditions to use other people's library in C/C++ coding?
It's simpler than you think. The compiler only needs to know that these functions exist to use them.

Which is why a proper C header file is full of declarations like this:

Code:
int functionname(int x, long y, void *z);

...along with the data types they need, of course.

C++ ones will look a little more like:

Code:
class myclassname {
public:
        // Most functions won't be defined right in the declaration
        myclassname();

        // Smaller functions may be defined here but MUST be inline
        inline int myfunction(void) { function_contents(); }
};

Quote:
Here I do not mean the compiling step, but at the step of writing source code (from scratch in a way!).
#include <header.h> for the compiler, and -lsomelibraryname for the linker, are really all that's required in the vast majority of cases. The compiler generates the giant pile of names the linker needs to look for, and the linker searches through all default plus requested libraries to turn these name-stubs into addresses a program can use.
This User Gave Thanks to Corona688 For This Post:
yifangt
 

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