Appending an unsized array

Is there a way to append an unsized array (of strings) to the end of another one? I have the following incomplete function:

Code:

String* all_files(String* sDir)[]
{
		String* f[] = Directory::GetFiles(sDir);
		int numFiles = f->get_Length();

		// The new items in f[] are added to the old ones and stored in files[] (the problem)

		String* d[] = Directory::GetDirectories(sDir);
		int numDirs = d->get_Length();

		for (int i=0; i < numDirs; i++)
		{
			all_files(d[i]);
		}

		return files;
}

(try-catch omitted).

The function basically is *supposed* to return an array of strings containing the full path of all the files in sDir. But I can't figure out how to add the new items in f[] to the old ones to generate the output. Btw as you can see I don't have any definitions for variable "files"; this is because I don't know where to define it. Vectors didn't work here.

Any help is appreciated.

Is there a way to append an unsized array

All arrays are required to have sizes, so there is no such thing as an "unsized array".

Vectors didn't work here.

Why not?

Maybe I wasn't using the right syntax for vectors, but I tried

Code:

vector<String*> f = Directory::GetFiles(sDir);

and it didn't work. I also tried vector<String> (without *) and still same thing... Like I said I'm not sure if I used the proper syntax, but I couldn't think of any other ways.

1) There's no such type as String or STring or strinG or striNG or strIng or sTrInG.

2) The simplest way to add elements to a vector is by using a vector's push_back() method. There is also a copy <algorithm> that you might find useful, e.g.

Code:

#include<iostream>
#include<string>
#include<vector> 
#include<algorithm> //copy(), back_inserter

using namespace std;

int main()
{
	vector<string> v;
	v.push_back("hello");
	v.push_back("world");

	string arr[] = {"hello", "moon"};
	int size = 2;
	
	vector<string> v2;
	v2.push_back("goodbye");
	v2.push_back("world");

	copy(&arr[0], &arr[size], back_inserter(v)); 
	//Specifies the range, which includes first but excludes last, i.e.
	//the elements from start to end - 1 are the elements in the range.
	//Back_inserter inserts the range at the back of v.

	copy(v2.begin(), v2.end(), back_inserter(v));

	vector<string>::iterator iter = v.begin(); //'iter' is like a pointer to v.begin();
	while(iter != v.end())
	{
		cout<<*iter<<" ";
		++iter;
	}
	cout<<"."<<endl;

	return 0;
}

3) If you can legally write this:

String* f[] = Directory::GetFiles(sDir);

then you can't write this:

vector<String*> f = Directory::GetFiles(sDir);

What type is f in the first line? What type is f in the second line?

More importantly what type does Directory::GetFiles(sDir) return? Whatever type it returns is the type of the variable you must declare in order to store the function's return value in that variable.

You need to read a tutorial on vectors. Just guessing what function's are available, e.g opertator=, is not usually going to work in C++.

String is in mscorlib.dll and is a part of the .NET framework.

You know this is a C++ forum, right?

I am writing my code in a C++ project, in a .cpp file, and all I have done is that I included mscorlib into my code. Since this dll is being used almost widely in C++ projects I guessed that someone would know s/th about it in this forum. But what matters is that the question I asked was for a C++ code; I was wondering if there's a simple method to append an array with another one in C++; the code was merely to provide better understanding...

Alrite, finally I managed to solve this...

Questions about .NET framework classes fit better in the C# forum really. unsized arrays are not in standard C++

Originally Posted by KIBO

Questions about .NET framework classes fit better in the C# forum really. unsized arrays are not in standard C++

I posted the exact same question in Microsoft's C# forum, and shortly it was moved to the C++ forum by the mods... and by unsized array I meant an uninitialized array (maybe I used wrong wording). Anyway this is done.