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Jul 4th, 2009

Help with a vector<vector<string> *>

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Hi, for a class, I'm trying to implement a separate-chaining hash table stored in a vector that contains pointers to vectors where the keys will be stored. This is basically what I have:

c++ Syntax (Toggle Plain Text)

    typedef vector<string> KeyChain;
    vector<KeyChain *> Table;

The problem I'm having is when I want to access the keys in the KeyChain, I don't know how to get to those values, this is what I've tried:

c++ Syntax (Toggle Plain Text)
    Table[value][index]
    Table[value]->[index]
    Table[value][index]
    Table[value]->[index]

What is the syntax for accessing the items in a vector that is referenced with a pointer in another vector? Thank you for your help!

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squall1986

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Jul 4th, 2009

Re: Help with a vector<vector<string> *>

Welcome squall1986,

Use may use :

C++ Syntax (Toggle Plain Text)
(*(Table[index]))[index];
(*(Table[index]))[index];

adatapost

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Jul 5th, 2009

Re: Help with a vector<vector<string> *>

Click to Expand / Collapse Quote originally posted by adatapost ...

Welcome squall1986,

Use may use :
C++ Syntax (Toggle Plain Text)
(*(Table[index]))[index];
(*(Table[index]))[index];

Thank you, that works, but I also asked my instructor about it, and he told me that he wanted us to do something along these lines:

c++ Syntax (Toggle Plain Text)
	vector<string> *Table;
	Table = new vector<string>[size];
	vector<string> *Table;
	Table = new vector<string>[size];

So I'll be doing that, but thanks for the help!

squall1986

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Jul 5th, 2009

Re: Help with a vector<vector<string> *>

So, where is a problem?

C++ Syntax (Toggle Plain Text)
  vector<string> *Table;
  Table = new vector<string>[2];
 
  Table[0].push_back("Aaa");
  Table[0].push_back("Bbb");
  Table[0].push_back("Ccc");
 
  Table[1].push_back("Ppp");
  Table[1].push_back("Qqq");
 
cout << "\n" << Table[0][0];
cout << "\n" << Table[0][1];
cout << "\n" << Table[0][2];
cout << "\n" << Table[1][0];
cout << "\n" << Table[1][1];
Table[0][0]="AAAAAA";
....
  vector<string> *Table;
  Table = new vector<string>[2];

  Table[0].push_back("Aaa");
  Table[0].push_back("Bbb");
  Table[0].push_back("Ccc");
    
  Table[1].push_back("Ppp");
  Table[1].push_back("Qqq");
 
cout << "\n" << Table[0][0];
cout << "\n" << Table[0][1];
cout << "\n" << Table[0][2];
cout << "\n" << Table[1][0];
cout << "\n" << Table[1][1];
Table[0][0]="AAAAAA";
....

adatapost

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Re: Help with a vector<vector<string> *>

Click to Expand / Collapse Quote originally posted by adatapost ...

So, where is a problem?

Umm ... I don't think there is a problem now, it's working fine for me. Are you asking me that because you see one and you want me to look for it ... ?

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