Re: Using Vectors in classes - public access
On May 11, 4:56 pm, andrewmor...@aol.com wrote:
Hello,
I've got a VC++ project containing multiple classes and a main
function. In one of the class functions, it reads from a text file and
places the data into a vector;
//
std::vector<std::vector<std::string> > applications (50,
std::vector<std::string>(12));
applications[colArr][0] = "Test1";
applications[colArr][1] = "Test2";
//
Which works fine for that classes function, however, I need for other
functions of the class, or potentially other classes to be able to
access the applications vector, most likely done through friend-ing
and inheritance.
I seem to be unable to get the applications vector to be publicly or
even privately declared inside the main class definition. I've tried
placing the vector definition in both sections, it causes
error C2059: syntax error : 'constant'
when I do.
Is there something I'm missing with this?
Thanks,
- Andy
-- Copy of UpdateFileArray.h ---
#ifndef _UPDATEFILEARRAY_H_
#define _UPDATEFILEARRAY_H_
#include <string>
#include <vector>
class UpdateFileArray
{
std::vector<std::vector<std::string> > applications (50,
std::vector<std::string>(12));
public:
void UpdateArray();
void ArrayLookUp();
friend class SearchVehicle;};
extern UpdateFileArray UFA;
#endif
The problem is that C++ cannot initialize datamembers (ither than
static const intergral types) wher ethey are declared. You need to do
the initialization in the constructor
#ifndef _UPDATEFILEARRAY_H_
#define _UPDATEFILEARRAY_H_
#include <string>
#include <vector>
class UpdateFileArray
{
std::vector<std::vector<std::string> > applications;
public:
void UpdateArray();
void ArrayLookUp();
friend class SearchVehicle;
UpdateFileArray():applications(50,
std::vector<std::string>(12)){}
};
extern UpdateFileArray UFA;
#endif
Then of course in a .cpp file somewhere, you will have
UpdateFileArray UFA;
This isn't exactly the most scalable approad to class design, but it
will fix you compilation problem.
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