upon failing to include a file

[metulburr]

i was looking for a method to define a function upon success of an include, and define that same function another way upon failing of that include.

#include <iostream>
#include <string>
#include <vector>
#include <dirent.h>
#include <cerrno>



int getdir (std::string dir, std::vector<std::string> &files){
	DIR *dp;
	struct dirent *dirp;
	if((dp = opendir(dir.c_str())) == NULL) {
		std::cout << "Error(" << errno << ") opening " << dir << std::endl;
		return errno;
	}

	while ((dirp = readdir(dp)) != NULL) {
		files.push_back(std::string(dirp->d_name));
	}
	closedir(dp);
	return 0;
}

int main(){
	
}

more specifically
I was looking for a way to say:
if including dirent.h succeeds, define getdir as above, else define getdir to return a string stating that it failed to include , and continue on with program

[Dy7SLyTq]

find out the include guards for dirent.h and then write directly above get dir
#ifdef _what_ever_the_include_guard_is

then at the end of the function #endif

[metulburr]

I am not really sure, there are a ton of preprocessor directives in there

code too long posted on codepad
http://codepad.org/SmspnTnD

[naraku9333]

@DTSCode I don't believe that will work, if the compiler can't find the header it will throw an error.

@metulburr
My suggestion is to use Boost.Filesystem.

Edit: Here is an untested example that should do what your code does using boost.

#include <boost/filesystem.hpp>
int getdir (std::string dir, std::vector<std::string> &files){
    using namespace boost::filesystem;
    path p(dir);
	directory_iterator endit;

	if(exists(p) && is_directory(p))
	{
		for(directory_iterator dit(p); dit != endit; ++dit)
			files.push_back(dit->string());
	}
}