How to use vector of structure ?

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  1. #1
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    How to use vector of structure ?

    Code:
    struct structtid
    {
      int tid; //transaction id list
      int *tidptr;  // pointer to the transaction
      int transnum; //size of each transaction
    };
    
    <vector>structtid t;
    
    structtid temp;
    temp.tid = 1;
    temp.transnum = 10;
    t.push_back(temp);
    I tried to add a structure into t but there is error. I also try to declare <vector>int tidptr in sttucttid, but there is error too..

    Can anyone help me? Thanks!

  2. #2
    C++ Witch laserlight's Avatar
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    Um, maybe because the syntax is vector<structtid> and vector<int>?
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  3. #3
    Epo
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    Using:

    #include <vector>

    Will allow you to declare a vector from the Standard Template Library:

    std::vector<int> Ages(10);

    Writing std:: all the time though could be a little annoying. So after the include, writing:

    using namespace std;

    Will import the std namespace and now you can just:

    vector<int> Ages(10);

    To declare 10 spots for an integer in the vector called Ages.
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    I understand that a vector of integer can be declared and elements in integer can be easily added to it. But what about a vector of structure? Where the structure is defined by me. Can it be done too?

  5. #5
    Registered User Tonto's Avatar
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    I see absolutely no reason why you could not I also added onto your code. A nifty feature of C++ is the fact the structs and classes are exactly the same (public vs. private, whatev). This means you can have a struct constructor, reducing the need for your temporary struct to push onto the vector. This code works fine for me.

    Code:
    struct structtid
    {
    	int tid;       // transaction id list
    	int *tidptr;   // pointer to the transaction
    	int transnum;  // size of each transaction
    
    	structtid(int tid, int transnum)
    	{
    		this->tid      = tid;
    		this->transnum = transnum;
    	}
    };
    
    int main(int argc, char *argv[])
    {
    	std::vector<structtid> t;
    	t.push_back(structtid(1, 10));
    
    	return 0;
    }
    I see absolutely no reason why you could not

  6. #6
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    whoa! thanks, i think this is what i need. i will try it later. thanks!

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