Hello,
I want to make a vector of 2d arrays. How do I do that. I tried different things... like
but that did not work.Code:vector <char *> vector_x; vector_x.pushback(new char[13][2]);
Also, how would specific elements be utilized? For the code above I tried using:
I hope my n00bness does not make you laugh too hard.Code:b_file>>*vector_x[index_i][index_y][0];
thanks
J
You need to use a double pointer, as I call it, or a pointer to a pointer. However I would much rather use a vector of a vector of a string. Pretty much the same job but much simpler.
Code:std::vector<char**> vector_x; std::vector<std::vector<std::string> > vector_y;
Desolation,
Thank for the help.
The pushback did not work though. Got the same compiler error. Here is the actual code I am using.
Code:vector <char **> HAND; while (!b_file.eof()) { HAND.push_back(new char[13][2]);
Desolation,
Another question. For your vector of a vector suggestion, how would I utilize it, e.g. how would I store a string?
It depends on what you're trying to do. Here's one example.Notice how I removed the eof() check in your code. That is generally bad practice and will often lead to incorrect input. If you're using operator>> or getline you can put that call inside the while control instead.Code:vector<vector<string> > HAND; string word1; string word2; while (b_file >> word1 >> word2) { vector<string> item; item.push_back(word1); item.push_back(word2); HAND.push_back(item); }
1. Can you be more precise than "doesn't work" because that doesn't mean anything to me. You're lucky that I know the answer though. You need to do something like this:Of course, you need to delete all those arrays somewhere in your application as well.Code:std::vector<char**> HAND; while(!b_file.eof() ) { char** tmp = new char*[13]; for(int i = 0; i < 13; i++) tmp[i] = new char[2]; HAND.push_back(tmp); }
Added that comment bit so you can see how to add a string but you don't need to initialize memory or whatever. =)Code:std::vector< std::vector< std::string > > HAND; while (!b_file.eof()) { HAND.push_back(std::vector< std::string > ( )); // HAND.back().push_back("foo") }
Thank you very much for all the information. You are a gentleman and a scholar.
