how to build string buffer table from std::list and structs

[rsennat]

Hi,
I'm having the following structures and std::list of that structs.

I need to read the list of list as below and build a buffer as a table information.
Any idea on how to build a table info (string buffer).

list<NVPairsWithId> m_ResponseObj;

struct NVPairsWithId
{
string m_id;
list<NVObject> m_NVPairs;
};

struct NVObject
{
string m_name;
string m_value;
};

This is how the data in it will be, (kind of each and every row information)
m_id=100
m_name=c1, m_name=c2
m_value=r1, m_value=r1

m_id=200
m_name=c1, m_name=c2
m_value=r2, m_value=r2

This, I need to traverse the list of list and build the buffer as
id c1 c2
100 r1 r1
200 r2 r2

Please help me out on this.
Thanks

[weaknessforcats]

If your buffer has to have entries like:

id c1 c2


why not just use:

struct Data
{
   string id;
   string name;
   string value;
};
 

and then just have a list<Data> ??

[rsennat]

It's not like that. For a single id, there could be multiple sets of names and values. here for id=100, {name = c1, value = r1}, {name = c2, value = r1}.
so it goes like that....

id c1 c2
------------
100 r1 r1
200 r2 r2

Any idea how can i build this..
thanks

If your buffer has to have entries like:

id c1 c2


why not just use:

struct Data
{
   string id;
   string name;
   string value;
};
 

and then just have a list<Data> ??

[weaknessforcats]

id=100, {name = c1, value = r1}, {name = c2, value = r1}.

I see.

Then in that case your approach will work:

list<NVPairsWithId> m_ResponseObj;

struct NVPairsWithId
{
string m_id;
list<NVObject> m_NVPairs;
};

struct NVObject
{
string m_name;
string m_value;
};

list<NVPairsWithId> m_ResponseObj;
NVPairsWithId id100;
id100.m_id = 100;
m_ResponseObj.puch_back(id100);
 

That gets the ids in m_ResponseObj.

Then to add a name/value pair you will need to traverse m_ResponseObj looking for the element whose m_id is, say 100, then you add the name/value pair to that element:

NVPairsWithId* ptr = FindMyId(100); //detail of searxch omitted
NVObject data;
data.name = "Ralph";
data.value = "45";
ptr->m_NVPairs.push_back(data);
 

More or less. I didn't compile or test this code.

Lastly, avoid naming conventions, like m_, for your variables. A member variable is this->name. The compiler can't check that everyone is using m_. Microsoft started this by having C programmers write C++.

[rsennat]

That's the way I'm doing it for putting the data into this.
But I would like to read the data back from it to build the string buffer table (tabular format).

Thanks

I see.

Then in that case your approach will work:

list<NVPairsWithId> m_ResponseObj;
NVPairsWithId id100;
id100.m_id = 100;
m_ResponseObj.puch_back(id100);
 

That gets the ids in m_ResponseObj.

Then to add a name/value pair you will need to traverse m_ResponseObj looking for the element whose m_id is, say 100, then you add the name/value pair to that element:

NVPairsWithId* ptr = FindMyId(100); //detail of searxch omitted
NVObject data;
data.name = "Ralph";
data.value = "45";
ptr->m_NVPairs.push_back(data);
 

More or less. I didn't compile or test this code.

Lastly, avoid naming conventions, like m_, for your variables. A member variable is this->name. The compiler can't check that everyone is using m_. Microsoft started this by having C programmers write C++.

[weaknessforcats]

I would think you could iterate m_ResponseObj and for each element you traverse m_NVPairs.

When you reach the end of m_NVPairs, you advance to the next element of m_ResponseObj. When you reach the end of m_ResponeObj, you are done.

The display format should be easy.