Conditions/suggestions to use shared library in C/C++ coding Post: 303017464

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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

05-16-2018

Registered User

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.

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language::intercal::bytecode

INTERCAL::ByteCode(3pm) 				User Contributed Perl Documentation				   INTERCAL::ByteCode(3pm)

TITLE

       Language::INTERCAL::Bytecode - intermediate language

DESCRIPTION

       The CLC-INTERCAL compiler works by producing bytecode from the program source; this bytecode can be interpreted to execute the program
       immediately; alternatively, a backend can produce something else from the bytecode, for example C or Perl source code which can then be
       compiled to your computer's native object format.

       The compiler itself is just some more bytecode. Thus, to produce the compiler you need a compiler compiler, and to produce that you need a
       compiler compiler compiler; to produce the latter you would need a compiler compiler compiler compiler, and so on to infinity. To simplify
       the programmer's life (eh?), the compiler compiler is able to compile itself, and is therefore identical to the compiler compiler compiler
       (etcetera).

       The programmer can start the process because a pre-compiled compiler compiler, in the form of bytecode, is provided with the CLC-INTERCAL
       distribution; this compiler compiler then is able to compile all other compilers, as well as to rebuild itself if need be.

       See the online manual or the HTML documentation included with the distribution for more information about this.

SEE ALSO

       A qualified psychiatrist

AUTHOR

       Claudio Calvelli - intercal (whirlpool) sdf.lonestar.org (Please include the word INTERLEAVING in the subject when emailing that address,
       or the email may be ignored)

perl v5.8.8							    2008-03-29						   INTERCAL::ByteCode(3pm)

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