well the following worked for me:
a iterator is basically a method for moving between the elements of a container. const_iterator is just one that doesn't allow you to change the elements' valueCode:#include <string> #include <vector> int main() { std::vector<std::string> vString(5); for (unsigned i=0; i<vString.size(); i++) { vString[i] = "Test"; } std::vector<std::string>::const_iterator it = vString.begin(); while (it != vString.end() ) cout<< *it++ << endl; }
>I get a bunch of wierd errors
Thantos' code wasn't meant to be cut and paste compiled. It omits parts and doesn't include the necessary headers.
>what is the const_iterator in your example
It's like a pointer that's specific to the vector.
>do I need it to create a vector of strings?
No, you can use integer indices if you want, or to be more correct, vector<string>::size_type indices.
>What does it do?
It gives you a way to portably point to the contents of a container object. You could use a string* and hope like hell that it works, but iterators are much better.
My best code is written with the delete key.
I have one more question. I need to define and assign memory to a new std::string, I know how much I need to assign, but I don't want to initialize it to anything, how can I do that? What is the proper syntax?
well you'll have to initalize it to something. Why not null?
Code:std::string str(10, '\0');
The const_iterator is a pointer, to go through all string stored int the buffer kept by vector. That cycle is simply a way to acess all strings. In Java you'll have something like and Iterator class and next() and hasNext() methods.
The STL string is generaly a template class therefore the class's definition is in the header. Open <string> file in you compiler's include dir and check it out. I warn you that if you have STLport headers the code is pretty confusing and almost unreadble but it works very well.I have two questions on std::strings, first of all, is there anyway to get the soucecode for string.cpp (or wherever the class is implemented)? Or, is there a way to get a complete list of member functions in std::string?
//edit
post beated
Code://memory allocated globally and class constructed //free pointer later with delete std::string *my_string = new std::string("abc"); //or, memory allocated locally, in function where it's declared //no need to use delete std::string my_string("abc");
Last edited by xErath; 12-05-2004 at 12:48 AM.
