Solved

Template question. I really do not understand what this wants....

Posted on 2006-11-06
3
197 Views
Last Modified: 2010-04-01
OK. I have a Template....
template<typename T>        

class LookupTable2
{
  public:
    LookupTable2 (void);
 
    unsigned int getRows (void) const;    

 private:
    std::vector<std::vector<T> > table2_; ///< Create table object.
 };

Then I have another class that inherits the above....

};

#include "LookupTable2.h"

#include <iostream>
#include <vector>
#include <cmath>
template<typename T>            

class LookupTable3 : public LookupTable2 <T>
{
  public:
    LookupTable3<T> (void);
    void printAttributes (void);
 
  private:
    std::vector<LookupTable2<T> > table3_;  // Create table object.
 
};


Then I have a main() in a driver

#include <iostream>

#include "LookupTable3.h"
using namespace std;


int main (void)
{
  unsigned int nRow, nCol;

  LookupTable2<float> table2iv();
   
  table2iv.getColumns();

  LookupTable3<float> table3iv();

  table3iv.printAttributes();

  return 0;
}


I am getting an error in both

  table2iv.getColumns();

  LookupTable3<float> table3iv();

in the main. The error is   error C2228: left of '.getColumns' must have class/struct/union type

What is this asking. I do not understand.....Can some one tell me what?
0
Comment
Question by:prain
3 Comments
 
LVL 14

Accepted Solution

by:
wayside earned 75 total points
ID: 17885272
>   LookupTable2<float> table2iv();
 
This is declaring a function that returns a LookupTable2<float> object, it is not declaring an object and calling the default constructor.

Get rid of the ()'s:

  LookupTable2<float> table2iv;
  LookupTable3<float> table3iv;

0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Often, when implementing a feature, you won't know how certain events should be handled at the point where they occur and you'd rather defer to the user of your function or class. For example, a XML parser will extract a tag from the source code, wh…
Written by John Humphreys C++ Threading and the POSIX Library This article will cover the basic information that you need to know in order to make use of the POSIX threading library available for C and C++ on UNIX and most Linux systems.   [s…
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…

932 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now